This patent application claims priority of a Chinese Patent Application No. 202110717757.2, filed on Jun. 28, 2021 and titled “PLUG CONNECTOR, RECEPTACLE CONNECTOR AND CONNECTOR ASSEMBLY”, the entire content of which is incorporated herein by reference.
The present disclosure relates to a plug connector, a receptacle connector and a connector assembly, which belongs to a technical field of connectors.
An existing connector assembly usually includes a plug connector and a receptacle connector which are mated with each other. For data transmission, the plug connector and the receptacle connector are respectively provided with a plurality of conductive terminals. However, with the continuous improvement of equipment requirements, the plug connector and the receptacle connector are not only required to have a data transmission function, but also other functions (such as a power supply function), which brings challenges to the design of the plug connector and the receptacle connector.
An object of the present disclosure is to provide a plug connector, a receptacle connector and a connector assembly with power supply function.
In order to achieve the above object, the present disclosure adopts the following technical solution: a plug connector, including: a tongue plate, the tongue plate extending along a longitudinal direction, at least one side of the tongue plate being provided with a plurality of conductive pads, the conductive pads located on a same side of the tongue plate being arranged at intervals along a transverse direction perpendicular to the longitudinal direction; and a metal shell, the metal shell being located on a periphery of the tongue plate, the metal shell including a first wall portion, a second wall portion opposite to the first wall portion, a first side wall connecting one side of the first wall portion and one side of the second wall portion, and a second side wall connecting another side of the first wall portion and another side of the second wall portion, the first wall portion, the second wall portion, the first side wall and the second side wall being jointly enclosed to form a receiving space to receive the tongue plate, the first wall portion defining an opening extending through the first wall portion in a direction away from the second wall portion, the opening being in communication with the receiving space, the conductive pads provided on the at least one side of the tongue plate being exposed in the opening; wherein the plug connector further includes at least one plug power terminal located on at least one side of the conductive pads in the transverse direction, the plug power terminal includes an elastic mating portion protruding toward the tongue plate in the transverse direction, and the elastic mating portion protrudes into the receiving space.
In order to achieve the above object, the present disclosure adopts the following technical solution: a receptacle connector, including: an insulating body, the insulating body including a base and a mating protrusion extending from the base, the mating protrusion including a mating surface and a mating slot extending through the mating surface; and a plurality of conductive terminals, the plurality of conductive terminals including a first row of conductive terminals and a second row of conductive terminals, the first row of each conductive terminal including a first elastic contact portion extending into the mating slot, the second row of each conductive terminal including a second elastic contact portion extending into the mating slot, the first elastic contact portions and the second elastic contact portions being located on opposite sides of the mating slot, respectively; wherein the receptacle connector further includes at least one receptacle power terminal, the receptacle power terminal includes a plate-shaped contact portion located on at least one side of the mating slot in a width direction of the mating protrusion, and the plate-shaped contact portion is located outside the mating protrusion.
In order to achieve the above object, the present disclosure adopts the following technical solution: a connector assembly, including: a plug connector, including: a tongue plate, the tongue plate extending along a longitudinal direction, at least one side of the tongue plate being provided with a plurality of conductive pads, the conductive pads located on a same side of the tongue plate being arranged at intervals along a transverse direction perpendicular to the longitudinal direction; and a metal shell, the metal shell being located on a periphery of the tongue plate, the metal shell including a first wall portion, a second wall portion opposite to the first wall portion, a first side wall connecting one side of the first wall portion and one side of the second wall portion, and a second side wall connecting another side of the first wall portion and another side of the second wall portion, the first wall portion, the second wall portion, the first side wall and the second side wall being jointly enclosed to form a receiving space to receive the tongue plate, the first wall portion defining an opening extending through the first wall portion in a direction away from the second wall portion, the opening being in communication with the receiving space, the conductive pads provided on the at least one side of the tongue plate being exposed in the opening; wherein the plug connector further includes at least one plug power terminal located on at least one side of the conductive pads in the transverse direction, the plug power terminal includes an elastic mating portion protruding toward the tongue plate in the transverse direction, and the elastic mating portion protrudes into the receiving space; and a receptacle connector, including: an insulating body, the insulating body including a base and a mating protrusion extending from the base, the mating protrusion including a mating surface and a mating slot extending through the mating surface; and a plurality of conductive terminals, the plurality of conductive terminals including a first row of conductive terminals and a second row of conductive terminals, the first row of each conductive terminal including a first elastic contact portion extending into the mating slot, the second row of each conductive terminal including a second elastic contact portion extending into the mating slot, the first elastic contact portions and the second elastic contact portions being located on opposite sides of the mating slot, respectively; wherein the receptacle connector further includes at least one receptacle power terminal, the receptacle power terminal includes a plate-shaped contact portion located on at least one side of the mating slot in a width direction of the mating protrusion, and the plate-shaped contact portion is located outside the mating protrusion; wherein the tongue plate is at least partially inserted into the mating slot, so that the plurality of conductive pads are in contact with the first elastic contact portions and the second elastic contact portions, and the elastic mating portion of the plug power terminal is in contact with the plate-shaped contact portion of the receptacle power terminal.
Compared with the prior art, the present disclosure enables the plug connector, the receptacle connector and the connector assembly to have a power supply function by adopting a plug power terminal located on at least one lateral side of the conductive pads and a receptacle power terminal located on at least one lateral side of the mating slot.
Exemplary embodiments will be described in detail here, examples of which are shown in drawings. When referring to the drawings below, unless otherwise indicated, same numerals in different drawings represent the same or similar elements. The examples described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of devices and methods consistent with some aspects of the application as detailed in the appended claims.
The terminology used in this application is only for the purpose of describing particular embodiments, and is not intended to limit this application. The singular forms “a”, “said”, and “the” used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings.
It should be understood that the terms “first”, “second” and similar words used in the specification and claims of this application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, “an” or “a” and other similar words do not mean a quantity limit, but mean that there is at least one; “multiple” or “a plurality of” means two or more than two. Unless otherwise noted, “front”, “rear”, “lower” and/or “upper” and similar words are for ease of description only and are not limited to one location or one spatial orientation. Similar words such as “include” or “comprise” mean that elements or objects appear before “include” or “comprise” cover elements or objects listed after “include” or “comprise” and their equivalents, and do not exclude other elements or objects. The term “a plurality of” mentioned in the present disclosure includes two or more.
Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.
Referring to
Referring to
In the illustrated embodiment of the present disclosure, the tongue plate 1 has a flat-plate shape and extends along a longitudinal direction L-L. At least one side of the tongue plate 1 is provided with a plurality of conductive pads 11. In the illustrated embodiment of the present disclosure, two opposite sides (for example, upper and lower sides) of the tongue plate 1 are provided with the plurality of conductive pads 11, respectively. The conductive pads 11 located on a same side of the tongue plate 1 are arranged at intervals along a transverse direction T-T perpendicular to the longitudinal direction L-L. Referring to
Referring to
Referring to
In addition, in order to improve the reliability of the plug connector 100 after being inserted into the receptacle connector 200 and to improve the grounding effect of the plug connector 100 and the receptacle connector 200, the plug connector 100 further includes a grounding spring 203 fixed to the metal shell 2. Referring to
Referring to
The first plug power terminal 31 includes a first fixing portion 311, a first extension arm 312 extending forwardly from the first fixing portion 311 along the longitudinal direction L-L, and a first mounting tail 313 extending from the first fixing portion 311. The first extension arm 312 includes a first elastic mating portion 3121 located at a free end of the first extension arm 312 in the longitudinal direction L-L. The first elastic mating portion 3121 protrudes toward the tongue plate 1 along the transverse direction T-T and protrudes into the receiving space 20 from one side. In the illustrated embodiment of the present disclosure, the first elastic mating portion 3121 has an arc shape. The first mounting tail 313 is located on an inner side of the first plug power terminal 31 as a whole, and is used to be inserted into the first mounting hole 101 of the built-in circuit board 10. Preferably, the first mounting tail 313 is soldered to the built-in circuit board 10 so as to achieve electrical connection with the built-in circuit board 10.
In order to better install and protect the first plug power terminal 31, the plug connector 100 further includes a first insulating mounting block 41 which is matched with the first plug power terminal 31. In the illustrated embodiment of the present disclosure, the first insulating mounting block 41 is fixed to the first side wall 23 of the metal shell 2. The first insulating mounting block 41 is clamped between the upper metal shell 201 and the lower metal shell 202. Specifically, the first insulating mounting block 41 includes first positioning slots 411 located at opposite ends of the first insulating mounting block 41 along the longitudinal direction L-L. The first positioning slots 411 are used for insertion of the first positioning tabs 231 so as to position and fix the first insulating mounting block 41 in the first mounting grooves 230. A side of the first insulating mounting block 41 facing the first plug power terminal 31 further includes a first relief slot 412 corresponding to the first elastic mating portion 3121 and providing a space for the first elastic mating portion 3121 to deform in a direction away from the receiving space 20. In addition, a side of the first insulating mounting block 41 facing the first plug power terminal 31 further includes a first positioning post 413. The first fixing portion 311 of the first plug power terminal 31 includes a first positioning hole 3110 that cooperates with the first positioning post 413. This arrangement is beneficial for fixing the first plug power terminal 31 to the first insulating mounting block 41.
Similarly, the second plug power terminal 32 includes a second fixing portion 321, a second extension arm 322 extending forwardly from the second fixing portion 321 along the longitudinal direction L-L, and a second mounting tail 323 extending from the second fixing portion 321. The second extension arm 322 includes a second elastic mating portion 3221 located at a free end of the second extension arm 322 in the longitudinal direction L-L. The second elastic mating portion 3221 protrudes toward the tongue plate 1 along the transverse direction T-T and protrudes into the receiving space 20 from another side opposite to the first elastic mating portion 3121. In the illustrated embodiment of the present disclosure, the second elastic mating portion 3221 has an arc shape. The second mounting tail 323 is located on an inner side of the second plug power terminal 32 as a whole, and is used to be inserted into the second mounting hole 102 of the built-in circuit board 10. Preferably, the second mounting tail 323 is soldered to the built-in circuit board 10 so as to realize electrical connection with the built-in circuit board 10.
In order to better install and protect the second plug power terminal 32, the plug connector 100 further includes a second insulating mounting block 42 which is matched with the second plug power terminal 32. In the illustrated embodiment of the present disclosure, the second insulating mounting block 42 is fixed to the second side wall 24 of the metal shell 2. The second insulating mounting block 42 is clamped between the upper metal shell 201 and the lower metal shell 202. Specifically, the second insulating mounting block 42 includes second positioning slots 421 located at opposite ends of the second insulating mounting block 42 along the longitudinal direction L-L. The second positioning slots 421 are used for insertion of the second positioning tabs 241 so as to position and fix the second insulating mounting block 42 in the second mounting grooves 240. A side of the second insulating mounting block 42 facing the second plug power terminal 32 further includes a second relief slot 422 corresponding to the second elastic mating portion 3221 and providing a space for the second elastic mating portion 3221 to deform in a direction away from the receiving space 20. In addition, a side of the second insulating mounting block 42 facing the second plug power terminal 32 further includes a second positioning post 423. The second fixing portion 321 of the second plug power terminal 32 includes a second positioning hole 3210 that cooperates with the second positioning post 423. This arrangement is beneficial to fix the second plug power terminal 32 to the second insulating mounting block 42.
Referring to
Referring to
The insulating body 5 includes a base 51 and at least one mating protrusion 52 extending from the base 51. In the illustrated embodiment of the present disclosure, two mating protrusions 52 are provided and spaced up and down. That is, the receptacle connector 200 is a receptacle connector with stacking ports. Since the upper mating protrusion 52 is similar in structure to the lower mating protrusion 52, only the upper mating protrusion 52 and its corresponding elements will be described below as an example. The lower mating protrusion 52 and its corresponding elements can be understood referring to the upper mating protrusion 52 and its corresponding elements.
Referring to
The first receiving groove 516 is substantially L-shaped and includes a first horizontal receiving groove 5161 and a first vertical receiving groove 5162. The first horizontal receiving groove 5161 extends forwardly through the front end surface 513 and is in communication with the first slot 518. The first vertical receiving groove 5162 extends downwardly through the mounting surface 515. Each of the first horizontal receiving groove 5161 and the first vertical receiving groove 5162 includes at least one first flared groove 5163. In the illustrated embodiment of the present disclosure, the first horizontal receiving groove 5161 includes one first flared groove 5163. The first vertical receiving groove 5162 includes two first flaring grooves 5163. Each first flaring groove 5163 includes a first extension groove 5163a and a second extension groove 5163b which extend in opposite directions. In the illustrated embodiment of the present disclosure, both the first extension groove 5163a and the second extension groove 5163b are substantially triangular. The first flaring groove 5163 is substantially diamond-shaped. It is understandable to those skilled in the art that in the first horizontal receiving groove 5161 and the first vertical receiving groove 5162, the number and shape of the first flared grooves 5163 can be flexibly set according to needs.
The second receiving groove 517 is substantially L-shaped and includes a second horizontal receiving groove 5171 and a second vertical receiving groove 5172. The second horizontal receiving groove 5171 extends forwardly through the front end surface 513 and is communication with the second slot 519. The second vertical receiving groove 5172 extends downwardly through the mounting surface 515. Each of the second horizontal receiving groove 5171 and the second vertical receiving groove 5172 includes at least one second flared groove 5173. In the illustrated embodiment of the present disclosure, the second horizontal receiving groove 5171 includes one second flared groove 5173. The second vertical receiving groove 5172 includes two second flaring grooves 5173. Each second flaring groove 5173 includes a third extension groove 5173a and a fourth extension groove 5173b which extend in opposite directions. In the illustrated embodiment of the present disclosure, both the third extension groove 5173a and the fourth extension groove 5173b are substantially triangular. The second flaring groove 5173 is substantially diamond-shaped. It is understandable to those skilled in the art that in the second horizontal receiving groove 5171 and the second vertical receiving groove 5172, the number and shape of the second flared grooves 5173 can be flexibly set according to needs.
The mating protrusion 52 includes a mating surface 520 and a mating slot 5201 extending through the mating surface 520. In the illustrated embodiment of the present disclosure, the mating protrusion 52 includes a first side end wall 521 and a second side end wall 522 which are located on opposite sides of the mating slot 5201, respectively. An outer side of the first side end wall 521 includes a first groove 5211 and a first protrusion 5212 protruding outwardly. In the illustrated embodiment of the present disclosure, the first groove 5211 does not extend inwardly through the first side end wall 521. That is, the first groove 5211 does not communicate with the mating slot 5201. In addition, the first groove 5211 does not extend forwardly through the first side end wall 521. That is, the first side end wall 521 includes a first blocking portion 5213 located at a front end of the first groove 5211. An outer side of the second side end wall 522 includes a second groove 5221 and a second protrusion 5222 protruding outwardly. In the illustrated embodiment of the present disclosure, the second groove 5221 does not extend inwardly through the second side end wall 522. That is, the second groove 5221 does not communicate with the mating slot 5201. In addition, the second groove 5221 does not extend forwardly through the second side end wall 522. That is, the second side end wall 522 includes a second blocking portion 5223 located at a front end of the second groove 5221.
Corresponding to one mating protrusion 52, the receptacle power terminal 7 includes a first receptacle power terminal 71 and a second receptacle power terminal 72. Preferably, the first receptacle power terminal 71 and the second receptacle power terminal 72 are symmetrically arranged on opposite sides of the mating slot 5201. The first receptacle power terminal 71 includes a first plate-shaped contact portion 711, a first main body portion 712, a first bent portion 713 connecting the first plate-shaped contact portion 711 and the first main body portion 712, and a first fork-shaped mounting portion 714 extending downwardly from the first main body portion 712.
The first plate-shaped contact portion 711 is received in the first groove 5211 of the mating protrusion 52. In an embodiment of the present disclosure, an outer surface of the first plate-shaped contact portion 711 does not protrude beyond an outer surface of the first blocking portion 5213. That is, the outer surface of the first plate-shaped contact portion 711 is flush with the outer surface of the first blocking portion 5213, or the outer surface of the first plate-shaped contact portion 711 is located inside the outer surface of the first blocking portion 5213. The first plate-shaped contact portion 711 includes a first deflection portion 7111 located at its front end and extending into the first groove 5211. The first deflection portion 7111 is located at the rear end of the first blocking portion 5213 along an insertion direction of the plug connector 100. With this arrangement, the first blocking portion 5213 can provide a better protection for the first plate-shaped contact portion 711 and prevent the first plate-shaped contact portion 711 from being damaged by the plug connector 100 or other plug connectors. Preferably, the outer surface of the first plate-shaped contact portion 711 is flush with the outer surface of the first blocking portion 5213. With this arrangement, on one hand, the first plate-shaped contact portion 711 can be brought into contact with the first plug power terminal 31 of the plug connector 100; and on the other hand, the plate-shaped contact portion 711 can be well protected.
In addition, the first plate-shaped contact portion 711 further includes a first through hole 7112 which cooperates with the first protrusion 5212, so as to facilitate positioning the first plate-shaped contact portion 711 in the first groove 5211. The first plate-shaped contact portion 711 is substantially located in a vertical plane. This arrangement can shorten the width required for the arrangement of the first plate-shaped contact portion 711 as much as possible, and is beneficial to reduce the profile of the receptacle connector 200.
In the illustrated embodiment of the present disclosure, the first bent portion 713 is received in the first slot 518. The first fork-shaped mounting portion 714 extends downwardly and protrudes beyond the mounting surface 515 so as to be electrically connected to the circuit board 400 (for example, by soldering). The first plate-shaped contact portion 711 and the first main body portion 712 are located in different vertical planes. In a width direction W-W of the mating protrusion 52, the first main body portion 712 is farther away from the mating slot 5201 than the first plate-shaped contact portion 711. With this arrangement, when the first plate-shaped contact portion 711 is in contact with the first plug power terminal 31 of the plug connector 100 and the working voltage or the instantaneous voltage is high, the influence of the conductive terminals 6 and the conductive pads 11 in contact with each other and data transmission can be reduced.
The first main body portion 712 is received in the first receiving groove 516. In the illustrated embodiment of the present disclosure, the first main body portion 712 includes a first extension protrusion 7121 positioned in the first extension groove 5163a, and a second extension protrusion 7122 positioned in the second extension groove 5163b.
The first fork-shaped mounting portion 714 includes a first mounting leg 7141, a second mounting leg 7142, and a first gap 7140 formed between the first mounting leg 7141 and the second mounting leg 7142. An end of the first mounting leg 7141 is inclined toward the second mounting leg 7142. An end of the second mounting leg 7142 is inclined toward the first mounting leg 7141. This arrangement facilitates the insertion of the first fork-shaped mounting portion 714 through the circuit board 400 so as to achieve pre-positioning. In the illustrated embodiment of the present disclosure, the first fork-shaped mounting portion 714 is soldered and fixed to the circuit board 400 so as to achieve electrical connection with the circuit board 400.
The second receptacle power terminal 72 includes a second plate-shaped contact portion 721, a second main body portion 722, a second bent portion 723 connecting the second plate-shaped contact portion 721 and the second main body portion 722, and a second fork-shaped mounting portion 724 extending downwardly from the second main body portion 722.
The second plate-shaped contact portion 721 is received in the second groove 5221 of the mating protrusion 52. In an embodiment of the present disclosure, an outer surface of the second plate-shaped contact portion 721 does not protrude beyond an outer surface of the second blocking portion 5223. That is, the outer surface of the second plate-shaped contact portion 721 is flush with the outer surface of the second blocking portion 5223, or the outer side surface of the second plate-shaped contact portion 721 is located inside the outer side surface of the second blocking portion 5223. The second plate-shaped contact portion 721 includes a second deflection portion 7211 located at its front end and extending into the second groove 5221. The second deflection portion 7211 is located at a rear end of the second blocking portion 5223 along the insertion direction of the plug connector 100. With this arrangement, the second blocking portion 5223 can provide a better protection for the second plate-shaped contact portion 721 and prevent the second plate-shaped contact portion 721 from being damaged by the plug connector 100 or other plug connectors. Preferably, the outer surface of the second plate-shaped contact portion 721 is flush with the outer surface of the second blocking portion 5223. With this arrangement, on one hand, the second plate-shaped contact portion 721 can be brought into contact with the second plug power terminal 32 of the plug connector 100; and on the other hand, the plate-shaped contact portion 721 can be well protected.
In addition, the second plate-shaped contact portion 721 further includes a second through hole 7212 which cooperates with the second protrusion 5222, so as to facilitate positioning the second plate-shaped contact portion 721 in the second groove 5221. The second plate-shaped contact portion 721 is substantially located in a vertical plane. This arrangement can shorten the width required for the arrangement of the second plate-shaped contact portion 721 as much as possible, which is beneficial to reduce the profile of the receptacle connector 200.
In the illustrated embodiment of the present disclosure, the second bent portion 723 is received in the second slot 519. The second fork-shaped mounting portion 724 extends downwardly and protrudes beyond the mounting surface 515 so as to be electrically connected to the circuit board 400 (for example, by soldering). The second plate-shaped contact portion 721 and the second main body portion 722 are located in different vertical planes. In the width direction W-W of the mating protrusion 52, the second main body part 722 is farther away from the mating slot 5201 than the second plate-shaped contact part 721. With this arrangement, when the second plate-shaped contact portion 721 is in contact with the second plug power terminal 32 of the plug connector 100 and the working voltage or instantaneous voltage is high, the influence of the conductive terminal 6 and the conductive pad 11 in contact with each other and data transmission can be reduced.
The second main body portion 722 is received in the second receiving groove 517. In the illustrated embodiment of the present disclosure, the second main body portion 722 includes a third extension protrusion 7221 positioned in the third extension groove 5173a and a fourth extension protrusion 7222 positioned in the fourth extension groove 5173b.
The second fork-shaped mounting portion 724 includes a third mounting leg 7241, a fourth mounting leg 7242, and a second gap 7240 formed between the third mounting leg 7241 and the fourth mounting leg 7242. An end of the third mounting leg 7241 is inclined toward the fourth mounting leg 7242. An end of the fourth mounting leg 7242 is inclined toward the third mounting leg 7241. This arrangement facilitates the insertion of the second fork-shaped mounting portion 724 through the circuit board 400 so as to achieve pre-positioning. In the illustrated embodiment of the present disclosure, the second fork-shaped mounting portion 724 is soldered and fixed to the circuit board 400 so as to achieve electrical connection with the circuit board 400.
Referring to
In the illustrated embodiment of the present disclosure, the first row of conductive terminals 61 and the first insulating block 91 are fixed to form a first terminal module 610. For example, the first row of conductive terminals 61 are insert-molded with the first insulating block 91 so as to improve the combination tightness of the two and improve the convenience of being assembled to the insulating body 5. Similarly, the second row of conductive terminals 62 and the second insulating block 92 are fixed to form a second terminal module 620. For example, the second row of conductive terminals 62 are insert-molded with the second insulating block 92 so as to improve the combination tightness of the two and improve the convenience of being assembled to the insulating body 5.
Of course, it is understandable to those skilled in the art that the first row of conductive terminals 61 and the second row of conductive terminals 62 can also be installed and fixed to the insulating body 5 by assembly.
As shown in
Referring to
Compared with the prior art, the present disclosure enables the plug connector 100, the receptacle connector 200 and the connector assembly 300 to have data transmission and power supply functions, and expands the applications of the plug connector 100, the receptacle connector 200, and the connector assembly 300 by adopting the plug power terminal 3 located on at least one side of the conductive pads 11 and the receptacle power terminal 7 located on at least one side of the mating slot 5201 along the transverse direction T-T.
In order for better understanding the specification and claims of the present disclosure, a general concept of component names beginning with “first”, “second”, “third”, and “fourth” in the present disclosure is a component name after “first”, “second”, “third”, and “fourth” are removed. For example, a general concept of the first plug power terminal 31 and the second plug power terminal 32 is the plug power terminal 3. A general concept of the first receptacle power terminal 71 and the second receptacle power terminal 72 is the receptacle power terminal 7, and so on.
The above embodiments are only used to illustrate the present disclosure and not to limit the technical solutions described in the present disclosure. The understanding of this specification should be based on those skilled in the art. Descriptions of directions, such as “front”, “back”, “left”, “right”, “top” and “bottom”, although they have been described in detail in the above-mentioned embodiments of the present disclosure, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the application, and all technical solutions and improvements that do not depart from the spirit and scope of the application should be covered by the claims of the application.
Number | Date | Country | Kind |
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202110717757.2 | Jun 2021 | CN | national |
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Number | Date | Country | |
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20220416457 A1 | Dec 2022 | US |