Patent Application
20160122208
1. Field of the Invention
The present invention relates to a fluid sterilization system and, more specifically, to a combined ultraviolet light and ozone fluid sterilization system for sterilizing fluid which includes a removable and replaceable internal reflective sleeve.
2. Related Art
In general, fluid sanitization systems are known. For example, assemblies for sanitizing and/or disinfecting water have been developed. Fluid (e.g., water) sanitization assemblies are useful in a myriad of different environments for various uses/applications, such as commercial and/or industrial applications. In some sanitization systems, ultraviolet lights are used which can emit ultraviolet light in the 254 nanometer and 185 nanometer ranges (UVC). Ultraviolet light in the 254 nanometer range can effectively destroy the nucleic acids in microorganisms, disrupting DNA and removing reproductive capabilities to kill such organisms. Further, ultraviolet light in the 185 nanometer range can convert oxygen present in air into ozone, which can be introduced into the fluid for further sterilization.
Existing systems utilizing ultraviolet light often include internal reflective sleeves for reflecting the emitted ultraviolet light and increasing the effectiveness thereof. However, these sleeves can become tarnished, dented, or otherwise damaged over time. As a result, reflectivity and effectiveness decreases, thereby negatively affecting the fluid sterilization capabilities of the entire system, and sometimes necessitating replacement of the entire system because the reflective sleeves are not easily removed and/or replaced from such systems.
Thus, a need exists for a combined ultraviolet light and ozone fluid sterilization system having an easily accessible and replaceable internal reflective sleeve. This and other needs are addressed by the combined ultraviolet and ozone sterilization system of the present disclosure.
The present disclosure is directed to a combined ultraviolet light and ozone fluid sterilization system for sterilizing fluid that includes a removable and replaceable internal reflective sleeve. The sterilization system includes a lower housing, an upper housing, a winged nut, a UV light manifold, a plurality of UV light assemblies, a plurality of UV light securing assembly, and a reflective sleeve. The lower housing defines a central cavity, has an open top and a closed bottom, and includes an inlet and one or more outlets. The inlet can be connected with an inlet fluid supply pipe, and one of the outlets can be connected with an outlet fluid pipe. The inlet pipe can include a venturi. The reflective sleeve is a tubular component that is perforated at both ends and includes a solid central portion. The reflective sleeve is removably positioned within the central cavity of the lower housing, and is removably secured with the lower housing by a plurality of locking tabs that engage the reflective sleeve. The upper housing is connectable to the UV light manifold, which is positionable adjacent the open top of the lower housing and connectable thereto. The UV light manifold and the lower housing can be secured with the winged nut. The UV light assemblies include a UV light and an ozone siphon pipe positioned within a quartz casing, which is sealed with an endcap. The UV light can generate UV light (e.g., UVC light), in both the 254 nanometer range and the 185 nanometer range. The UV light assemblies can each extend through, and be secured to, one of the plurality of UV light securing assemblies. The UV light manifold includes a plurality of UV light mounts, such that each of the UV light assemblies can be inserted into a respective UV light mount and a connected UV light securing assembly can be removably secured to the UV light mount.
The UV light assemblies are replaceable and can be removed from the UV light mount for replacement. The ozone siphon pipe of each UV light assembly can be operatively connected with the venturi, e.g., through a series of tubes, which can generate a suction effect to suction ozone generated by the UV lights through the ozone siphon pipe and introduce the ozone into the fluid stream. The positions and configuration of the reflective sleeve forces turbulent fluid to flow across the first perforated end and into the middle of the reflective sleeve where it is exposed to ultraviolet light, and then across the second perforated end where it exits the lower housing. The perforated ends of the reflective sleeve create a more uniform flow within the reflective sleeve, reduce air pockets, normalize the residence time of the fluid molecules, normalize the velocity of the fluid, and overall increase uniformity of treatment.
The sterilization system can be connected with a control panel that includes a controller, a plurality of ballasts, a plurality of fans, and a display. The controller can be connected with a main board for further control. The controller can include a plurality of power on delay circuits connected with the ballasts for delaying the start time of each ballast to prevent an overload situation.
The foregoing features of the invention will be apparent from the following Detailed Description, taken in connection with the accompanying drawings, in which:
The present disclosure relates to a combined ultraviolet light and ozone fluid sterilization system, as described in detail below in connection with
With specific reference to
The upper housing 14 is secured to the UV light manifold 64 by screws 110. The UV light manifold 64 is secured to the lower housing 12 by the winged nut 18. The winged nut 18 includes a body 36, a central opening 38, and first and second wings 40, 42 that facilitate user attachment and detachment of the winged nut 18 to the lower housing 12. The upper housing 14 includes a body 44, an upper rim 46, and an outlet port 48. A venturi tube 50 is connected to the outlet port 48 of the upper housing 14 and runs to a venturi 52 that is positioned on the inlet pipe 32. The outlet port 48, venturi tube 50, and venturi 52 are discussed in greater detail below. The cap 16 is positioned adjacent the upper rim 46 of the upper housing 14, and is connected to the upper housing 14 by a plurality of screws 54. When connected, the cap 16 and the upper housing 14 form a plurality of inlets 56. The inlets 56 provide access points for various electrical cables/wiring.
The reflective sleeve 58 is tubular in shape and has a solid central annular portion 74, a perforated lower annular portion 76, and a perforated upper annular portion 78. The reflective sleeve 58 connects to the bottom plate 60 by a plurality of snap-style locking tabs 80. The locking tabs 80 removably secure the reflective sleeve 58 in place, and allow the reflective sleeve 58 to be removed. Additionally, the reflective sleeve 58 is secured to the UV light manifold 64, which can include a plurality of locking tabs such as the locking tabs 80. Optionally, a separate and independent top plate could be provided and connected to the reflective sleeve 58. As such, the reflective sleeve 58 is removable and replaceable. This is beneficial as the reflective sleeve 58 can become tarnished over time, damaged, or dented for various reasons. In such instances, the reflective sleeve 58 could have a reduced level of reflectivity. When the reflectivity of the sleeve 58 is reduced, it can be desirable to remove and replace the damaged reflective sleeve 58 with a new one. In such circumstances, a user would simply disassemble the sterilization system 10, remove the damaged reflective sleeve 58, and replace it with a new reflective sleeve. Alternatively, a user can remove the reflective sleeve 58 for cleaning and/or maintenance purposes. The reflective sleeve 58 is generally formed of a material that reflects ultraviolet light and does not absorb ultraviolet light. For example, the reflective sleeve 58 can be made of, or coated with, a plurality of different materials, including, but not limited to, stainless steel, composites, reflectively coated thermoplastics, reflective PTFE or PFA, etc. It is noted that perforations need not be provided on the sleeve 58, and that a single opening could be provided on each of the top and bottom portions of the sleeve 58, if desired, to allow water inflow and outflow for the sleeve 58 while still achieving the desired flow characteristics through the sleeve 58.
An alternative embodiment of the reflective sleeve 58 is shown in
The perforations of the sleeve 58 shown in
As illustrated in
The UV light manifold 64 includes an annular wall 86, an annular flange 88 extending radially from the annular wall 86, a plurality of mounting holes 90, and a plurality of UV light mounts 92. The UV light manifold 64 includes a number of mounting holes 90 and UV light mounts 92 corresponding to the number of UV light assemblies 66 to be implemented in the system 10. In some embodiments, the UV light manifold 64 is interchangeable such that a user can have different UV light manifolds 64 for accommodating different specific applications. For example, the UV light manifold 64 can have a different number of UV light assemblies 66, e.g., three, four, five, etc. In such instances, a user might desire more or less UV light assemblies 66 based upon the need to increase or decrease the intensity and/or dosage of the UV light. The UV light manifold 64 is positionable over the lower housing 12 with the annular flange 88 being adjacent the upper opening 84 of the lower housing 12. The upper opening 84 can include a groove 94 that houses an O-ring 96. When the UV light manifold 64 is positioned adjacent the upper opening 84, the O-ring 96 is within the groove 94 and between the UV light manifold annular flange 88 and the groove 94. The winged nut 18 includes an annular shoulder 98 that extends radially inward to form the central opening 38, and internal threading 100. The winged nut 18 can be positioned over the UV light manifold 64 and threadedly secured to the lower housing 12 through engagement of the winged nut's internal threading 100 with external threads 102 of the lower housing 12, which are adjacent the groove 94 and upper opening 84. As the winged nut 18 is threadedly engaged with the lower housing 12, the annular shoulder 98 of the winged nut 18 engages the UV light manifold annular flange 88. Further tightening of the winged nut 18 compresses the O-ring 96 between the UV light manifold annular flange 88 and the groove 94, creating a water-tight seal.
Additionally, the groove 94 can include one or more notches 103 while the UV light manifold 64 can include one or more bosses 105 extending from a bottom of the annular flange 88. The bosses 105 are sized and positioned to engage the notches 103 when the UV light manifold 64 is placed over the lower housing 12. The spacing and engagement of the bosses 105 with the notches 103 ensures proper orientation and alignment of the UV light manifold 64, and subsequently the UV light assemblies 66, relative to the inlet port 24 and outlet ports 26, 28 during assembly of the sterilization assembly 10.
The upper housing 14 can also be attached to the UV light manifold 64. Specifically, the upper housing 14 defines an interior space 104, and includes internal mounts 106 and a siphon tube manifold 108 that includes the outlet port 48. A portion of the upper housing body 44 is configured to be positioned over the annular wall 86 of the UV light manifold 64, and connected to the UV light manifold 64 by a plurality of screws 110 that engage the plurality of mounting holes 90 of the UV light manifold 64. The cap 16 is then attached to the upper housing 14 by screws 54.
When the sterilization system 10 is fully assembled, there are a plurality of distinct regions for fluid flow. Specifically, there is an inlet flow region 114, a pre-sterilization region 116, a sterilization region 118, a post-sterilization region 120, a first outlet flow region 122, and a second outlet flow region 124. The pre-sterilization region 116, sterilization region 118, and post-sterilization region 120 are within the tubular body 22 of the lower housing 12. The inlet flow region 114 is formed by the inlet port 24 and provides fluid to the pre-sterilization region 116, which is internal to the lower housing 12. The pre-sterilization region 116 is an annular region formed external to the sleeve 58, and between the sleeve 58, the tubular body 22, and the O-ring assembly 62. The pre-sterilization region 116 is adjacent the inlet flow region 114. The sterilization region 118 is a tubular flow region that is internal to the sleeve 58. The post-sterilization region 120 is similar to the pre-sterilization region 116, and is an annular region formed external to the sleeve 58 between the sleeve 58, the tubular body 22, and the O-ring assembly 62. The post-sterilization region 120 is adjacent the first and second outlet flow regions 122, 124. The pre-sterilization region 116 and the post-sterilization region 120 are external to the sleeve 58 and separated from one another by the O-ring assembly 62. The flow of fluid through the sterilization system 10 is discussed in greater detail below.
The securing collar 140 includes an externally threaded wall 150 for securing with one of the UV light mounts 92. The end cap 142 includes a base 152 and a shaped boss 154 extending from the base 152. The base 152 includes a removed section or notch 156 that provides a space for the ozone siphoning pipe 134 to extend through and connect with one of the ozone siphon tubes 70. A plurality of electrical contact pins 158 extend through the end cap 142. As shown, two contact pins 158 extend through the end cap base 152 and two contact pins 158 extend through the end cap boss 154, each of which is in electrical communication with the UV amalgam lamp 132. The shaped boss 154 is generally shaped with a matching geometry to a plug (not shown) for connecting the UV light assembly 66 with a power and/or control source.
As shown in
The UV light assemblies 66 are each configured as follows: the securing collar 140 is placed over the centered and off-center cylindrical walls 160, 162 of the end cap 142 such that the securing collar 140 is adjacent the end cap base 152. The UV lamp 132 is secured with the ozone siphoning pipe 134 by the first and second fasteners 136, 138, such that the ozone siphoning pipe 134 generally extends across the entirety of the UV lamp 132. The first and second fasteners 136, 138 retain the ozone siphoning pipe 134 in close proximity to the UV lamp 132. The UV lamp 132 is inserted into the off-center cylindrical wall 162 of the end cap 142 and engages the contact pins 158 extending through the end cap 142. The ozone siphoning pipe 134 is positioned on the outside of the off-center cylindrical wall 162 and extends across the centered cylindrical wall notch 164 and the base notch 156. The quartz casing 126 is positioned over the UV lamps 132, the first and second fasteners 136, 138, the ozone siphoning pipe 134, the end cap centered cylindrical wall 160, and the end cap off-center cylindrical wall 162, and is between the interior face of the externally threaded wall 150 of the securing collar 140 and the end cap's centered cylindrical wall 160. The open end of the quartz casing 126 abuts an internally extending radial shoulder 166 (see
Each UV light assembly 66 can be attached to a UV light securing assembly 68 and inserted into a respective UV light mount 92 and secured thereto through threaded engagement of the externally threaded wall 150 of the securing collar 140 with an internally threaded wall 170 of the respective UV light mount 92 (see
The UV lamps 132 are preferably low-pressure, amalgam ultraviolet lamps that generate two different wavelengths, e.g., about 254 nanometers (254 nm) and about 185 nanometers (185 nm) of UVC light. The UVC light emitted in the 254 nm range can effectively destroy the nucleic acids in microorganisms, which disrupts their DNA and removes their reproductive capabilities, eliminating the formation of subsequent generations, and eventually killing them. Accordingly, the 254 nm wavelength UV light disinfects and sanitizes the water. Additionally, as discussed above, the sleeve 58 is made of a reflective material, e.g., stainless steel, so that the generated UV light reflects off of the sleeve 58 to increase the exposure of the water to the 254 nm wavelength UV light. Additionally, the sleeve 58 reduces UV exposure of the lower housing 12 itself, which may be constructed of a clear UV-resistant plastic polymer that can be damaged over time due to excessive UV exposure. Thus, the sleeve 58 prolongs the life of the lower housing 12, as well as any other components constructed from the plastic polymer. The UVC light emitted in the 185 nm range is utilized for ozone generation. Particularly, the UVC light emitted in the 185 nm range converts oxygen to ozone through corona discharge and the passing of air containing oxygen over the UV lamps 132. Therefore, the oxygen contained within the air between the quartz casing 126 and the UV lamp 132 is converted into ozone by the 185 nm wavelength UV light emitted by the UV lamp 132. As the ozone is generated, it is contained by the quartz casing 126 and drops to the bottom of the lower end 128 of the quartz casing 126 because the generated ozone has a greater density than air. The generated ozone is removed from the quartz casing 126 and introduced into the fluid stream through a tubing system in which the siphoning pipes 134 are connected to the siphon tubes 70 that, in turn, are connected to the siphon tube manifold 108 which, in turn, is connected with the venturi tube 50, which is finally connected with the venturi 52 located on the inlet pipe 32. When water flows through the inlet pipe 32 and into the lower housing 12 a pressure differential is created in the venturi 52 causing a suction effect to occur in the venturi tube 50 connected with the venturi 52. This suction effect causes the siphoning pipes 134 to draw ozone from the bottoms of the quartz casings 126, through the siphoning pipes 134, the siphoning tubes 70, the siphon tube manifold 108, the venturi tube 50, and the venturi 52, whereupon the ozone is introduced/injected into the water flowing through the inlet pipe 32. As the ozone is removed, air is drawn into the quartz casing 126 through the plurality of vents 168 that are provided in the securing collar 140, which are open to atmosphere. Accordingly, the oxygen supply is constantly being replenished as ozone is generated. The ozone that is introduced into the water acts to oxidize, and thus destroy, organic matter, further sterilizing the water. It is noted that the UV lamps 132 need not emit wavelengths in both the 254 nanometer range and the 185 nanometer range, and that the UV lamps 132 could emit a single wavelength of light, if desired.
Turning now to the flow of fluid through the sterilization system 10, fluid generally flows into the sterilization system 10 at the inlet port 24 and exits the sterilization system 10 at one of the first and second outlet ports 26, 28. The fluid flowing through the sterilization system 10 generally flows in a serpentine pattern due to the orientation of the flow regions, which will now be discussed in greater detail. Particularly, fluid is provided to the system 10 by the inlet pipe 32 and generally flows through the system 10 as follows: from the inlet flow region 114, to the pre-sterilization region 116, to the sterilization region 118, to the post-sterilization region 120, and finally to one of the first and second outlet flow regions 122, 124 where the water is circulated to the pool or spa by the outlet pipe 34. The inlet pipe 32 is in fluidic communication with the pool or spa, such that the water flowing through the inlet pipe 32 is pool/spa water that is recirculated to the pool/spa after sterilization by the outlet pipe 34.
Fluid is first introduced to the system 10 at the inlet pipe 32 where it flows across the inlet flow region 114 and the venturi 52. As the fluid flows across the venturi 52, a pressure differential is created in the venturi 52 and ozone is suctioned therethrough, as discussed above, and introduced into the flow. As the liquid flows from the inlet flow region 114 to the pre-sterilization region 116, the fluid flows towards the perforated lower annular portion 76 of the sleeve 58. The fluid then flows across the perforated lower portion 76 of the sleeve 58 and into the sterilization region 118 within the sleeve 58. The UV light assemblies 66 are positioned within the sterilization region 118, such that they sterilize fluid flowing through the sterilization region 118. Accordingly, the fluid flows through the sterilization region 118, and across the UV light assemblies 66, and toward the perforated upper annular portion 78. The fluid is sterilized by the UV light assemblies 66 while it is in the sterilization region 118, as well as by the ozone introduced by the venturi 52 in the inlet flow region 114. The fluid then flows across the perforated upper portion 78 and into the post-sterilization region 120. From there, the fluid flows into one of the first and second outlet flow regions 122, 124, exits through one of the first and second outlet ports 26, 28, and is returned to the pool/spa through the outlet pipe 34.
The fluid flowing into the system 10 and toward the perforated lower portion 76 is generally very turbulent prior to flowing across the perforated lower portion 76 and into the sterilization region 118. However, the perforated lower portion 76 is specifically designed to create a more uniform flow within the sterilization region 118, reduce air pockets, normalize the residence time of the fluid molecules, normalize the velocity of the fluid, and increase uniformity of treatment. Without the perforated lower portion 76, the fluid flowing through the system 10 would be very turbulent and generally random, meaning that some of the fluid molecules may flow through the entire system very quickly, e.g., have a low residence time, while other fluid molecules may take a very long time to flow through the system, e.g., have a high residence time. In this situation, there would be a discrepancy between treatment and sterilization of the fluid molecules that form the flowing fluid, with some of the fluid molecules not having a sufficient “residence” time to be fully sterilized.
As described above, with the sleeve 58 installed in the lower housing 12, water is forced into a more controlled flow pattern where it cannot flow directly from the inlet to the outlet, but instead must flow in a serpentine pattern. Essentially, the water flows through the system 10 in a controlled plug flow pattern that enhances the effectiveness of the sterilization system 10. Additionally, the sleeve 58 reduces air buildup and/or entrapment of air in the top of the lower housing 12, especially at lower flow rates. This occurs because the sleeve 58 creates a “stovepipe” effect where the flow is forced over the top of the sleeve 58, e.g., through the perforated upper annular portion 78, which evacuates air from the top portion of the central cavity 82. Additionally, the perforated lower portion 76 and the perforated upper portion 78 lower the pressure across the system 10, and can result in greater open flow area that reduces the head loss through the system 10. Further, the sleeve 58 can be sized so that the annular regions between the sleeve 58 and the inside wall of the lower housing 12, e.g., the pre-sterilization region 116 and the post-sterilization region 120, are sized with an open area equal to or greater than the port area of the pipes 32, 34 connected to the sterilization system 10, resulting in reduced head loss through the sterilization system 10.
Further, the perforations included in the sleeve 58 act as a baffle with the effect of causing large bubbles of air or gas, e.g., ozone, to break apart, resulting in smaller bubble sizes, which in turn can result in a greater mass transfer through the unit thus enhancing the sterilization performance of the system 10. Additionally, utilizing a cylindrical sleeve, e.g., sleeve 58, as a baffle provides greater surface area to generate a baffle effect than traditional baffles, which are generally flat, perforated plates. The traditional flat, perforated plate baffles are limited in surface area to less than the cross-sectional area of an associated pipe or vessel, while the cylindrical sleeve 58 is capable of having an increased surface area for generating a baffle effect.
The perforations included in the perforated upper and lower annular portions 76, 78 can be any size and/or shape, and can also be patterned to shape the flow into, across, and out of the sleeve 58, as well as direct flow to different parts of the vessel to enhance treatment of the water. For example, a mixture of small and large perforations can be included, with the small perforations being on a portion of the perforated upper and lower annular portions 76, 78 adjacent the inlet flow region 114 and one of the outlet flow regions 122, 124 and the large perforations being on an opposite side of the small perforations. Such a configuration could allow more equal distribution of flow and more normalized fluid velocities through the sterilization region 118. In another example, varying patters of perforations around the perforated upper and lower annular portions 76, 78 could be utilized to direct flow to desired sections of the sterilization region 118 and to optimize head loss characteristics within the lower housing 12. The perforations included in the upper and lower annular portions 76, 78 could be patterned to allow light to escape the sleeve 58 in a desired pattern or orientation, such that a company logo or other indicia can be displayed when the sterilization system 10 is operating in order to achieve a desired aesthetic or marketing goal.
Additionally, the sleeve 58, and more specifically the perforated upper and lower annular portions 76, 78 thereof, can be utilized to strain fluid entering the sterilization region 118 to prevent ingress of debris into the sterilization region 118, which could damage the UV light assemblies 66, and particularly the quartz casing 126. Further, the sleeve 58 and the perforated upper and lower annular portions 76, 78 thereof can be used to strain fluid leaving the sterilization region 118 to prevent the egress of debris from the treatment chamber in the event that the quartz casings 126, or other component of the UV light assemblies 66, are damaged, e.g., fractured.
The sleeve 58 also significantly reduces, or eliminates, direct impingement of incoming fluid on the quartz casings 126, reducing the likelihood of fracturing the quartz casings 126 due to the force of flow through the system 10, e.g., at startup. The sleeve 58 additionally reduces vibration of the quartz casings 126 during operation since the perforated upper and lower annular portions 76, 78 thereof redirects flow around the sleeve 58, thus reducing the turbulence of flow and forces that would otherwise act directly on, and result in extreme vibration of, the quartz casings 126.
Furthermore, the O-ring assembly 62, and the fluid-tight seal created thereby, ensures that there are no stagnant areas in the lower housing 12 during operation, thereby eliminating the possibility of waterborne buildup of bacteria, etc., in the areas within the vessel that are not exposed to UV light. In shut-off conditions, all fluid that was retained in the sterilization region 118 and the post-sterilization region 120 has been treated, while all fluid in the pre-sterilization region 116 will be automatically forced through the sterilization region 118 once the system 10 is restarted, ensuring that no untreated water leaves the system 10.
The present disclosure provides for additional modularity in implementation, whereby a user can mix lamps of different intensities and/or wavelengths within the same unit. For example, in a three lamp system, such as the one illustrated in connection with
The main control board 252 is connected with the display 216 and can be connected with a keypad 253. The main control board 252 is connected with the controller 226 at the third connector 230c, the fourth connector 230d, and also with a BNC connector 264 of the controller 226. The BNC connector 264 is connected with a converter 266. The main control board 252 provides the controller 226 with power through the third header 228c and third connector 230c, and provides commands through the fourth header 228d and fourth connector 230d. The main control board 252 also receives data from the controller 226 through the fourth header 228d and fourth connector 230d. The third header 228c is connected with the AC/DC 12V power supply 234 and the EMC conductance filter 236. The AC/DC 12V power supply 234 is connected with a power on indicator 268 and provides power to the first, second, and third power on delay circuits 240, 242, 244 and the first and second fan control circuits 246, 248. The first and second fan control circuits 246, 248 are connected to and control the fans 224. The fourth header 228d is connected with the flow detector and interlock detector 238, and connects the flow detector and interlock detector 238 with the main control board 252, such that the main control board 252 can provide instructions and data to the flow detector and interlock detector 238 and can receive data from the flow detector and interlock detector 238. The flow detector and interlock detector 238 can be connected with the first and second inputs 232a, 232b, which can be respectively connected with a flow switch 268 and the sensor 72. The flow detector and interlock detector 238 is also in communication with the first, second, and third power delay circuits 240, 242, 244 and provides instructions for the ballasts 222a-222e to be turned off when the detector 238 determines that the sterilization system 10 has been opened or there is no flow through the sterilization system 10. The flow detector and interlock detector 238 can also include a flow detector light 270 that is illuminated when a flow is detected through the sterilization system 10.
Having thus described the invention in detail, it is to be understood that the foregoing description is not intended to limit the spirit or scope thereof. It will be understood that the embodiments of the present invention described herein are merely exemplary and that a person skilled in the art may make many variations and modification without departing from the spirit and scope of the invention. All such variations and modifications, including those discussed above, are intended to be included within the scope of the invention.
The present application claims the benefit of priority to U.S. Provisional Patent Application No. 62/043,087, filed on Aug. 28, 2014, the entire disclosure of which is expressly incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 62043087 | Aug 2014 | US |
