Patent Application
20130255621
Not Applicable
Not Applicable
1. Field of the Invention
This invention relates to the art of ROTARY MECHANISMS in general, and specifically relates to the art of ROTARY INTERNAL COMBUSTION ENGINES wherein combustible gases are compressed, ignited, and expanded to rotate the engine shaft and to the art of non-combusting rotary pumps and motors; it is furthermore capable of being modified to use numerous types of fuels and gases, for use on all types of rotary-driven tools and machines for industrial, medical, agricultural, commercial, military, and personal use, as well as for use on all types of transportation vehicles, including land, sea, and air transport now known or later developed, and for any other application.
2. Description of the Prior Art
Prior art of possible relevance to this invention has not been identified as of this date. The following United States patent documents were examined in search of prior art containing the disclosures presented in this patent application:
The particulars of the present invention have neither been contemplated nor anticipated in the patents that were examined. Several issues have been of interest during the course of searching prior art: First, it is noted that not every design is capable of functioning as a rotary diesel engine. Second, none of the designs examined bears any resemblance to the engine in this application. Third, prior art patents place great emphasis on the shape and function of the design's combustion chamber. It appears that the goal of rotary engine design is to find a chamber and rotor combination that synchronizes perfectly so that these two components, working together, generate an entire range of power output using a minimum number of moving parts. The claims sections of many rotary engine patents specify the shape of chamber and rotor, not merely for descriptive purposes, but to protect a critical feature of an entire engine concept. Previously patented chamber designs include chambers which are circular, spherical, oval, epitrochoidal, annular, triangular, cylindrical, interlaced circular shaped, toroidal, concentric cylinders, and overlapping circles, to mention a few. Rotors have been presented as triangular, cylindrical, elliptical, crescent-shaped, disk shaped, annular, and oval. The foregoing widely diverse rotary engine designs show that there is an ongoing quest for a design that offers all of the advantages of the Wankel, but can also function as a diesel engine, and that furthermore offers breakthrough solutions in terms of chamber/rotor synergy, reliability, functionality, adaptability, and economy. It would appear that some solutions proffered to date tend to be more complex than the original Wankel engine and therefore, while addressing certain long-term shortcomings, tend to introduce new feasibility issues. The quest for a simple, straightforward, and comprehensive design gives rise to the present invention and its various embodiments.
It is an object of the present invention to introduce a new rotary engine configuration that dispenses with the need for an epitrochoid combustion chamber and a three-apex rotor. In particular, there is concern about the need for junction lobes on the chamber wall, as well as the need for a triangular piston (Reulleaux triangle). These bumps or junctions in the chamber wall have a place in the Wankel design: in cooperation with the rotor, they separate the chamber into three sub-chambers, make the chamber airtight, allow for the compartmentalization of the various Otto cycle phases. However, from another perspective they are a necessary requirement of a particular formulation and do not represent an optimal design. The lobe junctions in the Wankel design act like speed bumps on a highway—they inhibit forward motion. These lobes interfere with the smooth, continuous operation of the rotor, cause wear and tear on the seals, and generate unnecessary vibration. Thus, it is another object of this invention to create a combustion chamber wall that is free of any protrusions that would in any way interfere with the forward progress of a rotary drive element.
It is a further object of the present invention to produce a rotary engine that is simpler than the Wankel configuration and that utilizes a minimum number of moving parts. It would appear that most of the alternative solutions and/or improvements to the Wankel tend to introduce additional complexities. Indeed, some recently patented rotary engine designs are highly intricate and complex, containing many components and many moving parts.
It is a further object of the present invention to a produce a device capable of operating as a diesel engine, but easily reconfigured to function in other embodiments, including, but not limited to, gasoline engines, steam engines, hydraulic motors, air-pressure motors, gas-pressure motors, fluid and hydraulic pumps, and air pumps.
It is a further object of this invention to provide a combustion engine that operates with the use of a “straight through” or simple shaft rather than an eccentric shaft. This object addresses concern with the use an eccentric shaft and the resulting vibration caused by the spinning rotor turning on an axis offset from the shaft axis. Since the use of an eccentric shaft is a necessary solution to an otherwise intractable problem, namely the interaction of a rotary drive element and its chamber, it is believed that the present invention's new configuration will contribute toward eliminating the source of the problem and thereby eliminate the need for an eccentric shaft. The shaft should have a precisely defined stationary position yet allow the apices of a rotary drive element to remain in continuous contact with the chamber wall, and be both simpler and less costly to manufacture than a conventional rotary eccentric shaft.
It is a further object of this invention is to provide a rotary engine in which the combustion chamber and the rotary drive element fit together perfectly “hand in glove,” without the need, for any other adjustments, be they design or mechanical, to compensate for their otherwise inherent inability to mesh perfectly, without resorting to compensating hardware.
It is a further object of this invention to outfit an engine with at least two rotors, each in its own compartment, able to rotate in a clockwise direction and swing freely from side to side in accordance with the shape of the chamber.
It is a further object of this invention to propose an engine amenable to having additional pairs of rotary drive elements added, cascaded on the same plane, operating in tandem with the first pair, and achieving a vastly increased level of continuous power output without resorting to placing the additional pairs of rotary drive elements at a 90° angel to the first pair, but capable of doing so if necessary.
It is a further object of this invention to allow the rotary drive elements and shaft to turn at exactly the same number of revolutions; that is, at the same rotational speed. This in contrast to those engines using the Wankel pattern, in which the drive shaft makes three revolutions for every single revolution of the rotor. As noted by Wang (U.S patent 20090114184), the power output in a traditional rotary engine is limited due to this difference in rotation speed.
It is a further object of this invention to maintain a simplicity of design and construction, incorporating features common to conventional rotary engines, such as: a housing, a shaft, rotary drive element(s), spring-loaded seals, intake and exhaust ports/valves with activators, a fuel supply system, and in a gasoline version, an ignition device. However, it is desired to eliminate many of the components important to other designs, such as: baffles, paddles, vanes or other appendages attached to the rotor; trough-like pockets or recesses on the rotor faces; a complex/multi-segmented shaft, a gear train (whether intermeshing, epicyclical, or planetary gear system), gear teeth on the rotors, and rotor journals or lobes.
The aforementioned objectives result in the formulation of a rotary engine design that constitutes the basis of the present invention.
The following are some of the advantages of the present invention:
The unique shape of the working chamber permits the use of a two-apex rotary drive element rather than a three-apex rotor that is used in engine designs currently in production. The use of a two-apex rotary drive element rather than a three-apex rotor translates into less friction, heat, and wear on the chamber wall.
The engine housing is simpler to manufacture than a complex epitrochoid rotary engine chamber.
The engine chamber wall is one continuous surface without hills and valleys.
In contrast to the reciprocating movement of a piston, a rotary drive element in this invention will turn in the same direction at all times without any chamber wall impediments to slow, impede or divert its path.
The smooth, continuous chamber wall translates into less friction, heat, and wear on the seals.
The rotary drive element moves freely on the shaft without the need for expensive gear teeth and attendant gear systems.
The simple design of the rotary drive element reduces the steps needed for its manufacture.
The particular positioning of the shaft allows the two apices of a free-sliding rotary drive element to remain in continuous contact at all times with the opposite walls of the chamber. This dispenses with the need for an expensive eccentric system that in other designs allows a rotor to enter recessed chamber areas.
Inasmuch as the rotary drive element's apices sweep the entire surface of the chamber wall during the course of a revolution, there will be a continuous self-cleaning effect. Reduced engine performance due to carbon build-up is thereby eliminated, along with costly service or repairs.
The unique shape of the chamber, in combination with the free movement of the rotary drive element on the shaft, allow for the continuous creation and dissolution of a large area for intake/exhaust, and a small area for compression/ignition. This dispenses with the need for supplementary recesses either in the chamber wall or on the rotor faces.
The power-output shaft design is straightforward. It is anticipated that manufacturing this invention's shaft will be less complicated and less expensive than a conventional rotary engine eccentric shaft.
It is projected that the horsepower generated by this invention will be six times that of a conventional internal combustion piston-type engine for the same size.
Should a manufacturer desire to operate this invention in a counterclockwise direction, a mirror image of the chamber pattern will yield the desired result.
The rotary engine of the present invention is free of ambiguities and free of circuitous measures. It is simple, easy to implement, and economical to manufacture.
The objects and advantages mentioned above will become clearly evident through the following detailed description of the invention, its many embodiments, and its operation. Other objects and advantages will become apparent from the detailed description of the invention and the drawings. The method whereby the inventor created the required design for the chamber, rotor, and power-output shaft is explained in detail forthwith:
In accordance with an embodiment of the present invention a rotary internal combustion diesel engine capable of additional embodiments comprises a housing containing a cavity of a particular design, a two-apex rotary drive element, a power-output shaft, a fuel supply system, air-intake and gas-exhaust channels, and where required by alternative embodiments, an ignition source or input/output ports.
30. Yousroid Pattern-Making Device
32. Platform
32
a. Bolt
32
b. A sheet of paper, vellum or other suitable drawing surface.
34 Large wheel
34
a. Center of large wheel 34
36. Small wheel
36
a. Support shaft for small wheel
36
b. Small wheel aperture
38. Armature
38
a. Slot to hold ball bearing support post 42a
38
b. Slot to hold writing instrument 44
40. Spring
42. Ball bearing
42
a. Ball bearing support post
44. Writing instrument
44
a. Hex screw
46. Outer rotor housing (
48. Yousroid cavity and/or chamber
48
a. Larger yousroid sub-chamber space
48
b. Smaller yousroid sub-chamber space
48
c. Yousroid chamber wall
50. Generating point
50
a. Center of small wheel 36
52. Power-output Shaft (
54. Rectangular segment on power-output shaft (
56. Rotor
58. Aperture in rotor
60. Rotor apex one
62. Rotor apex two
64. Rotor face one
66. Rotor face two
68. Air-intake channel with valve
70. Exhaust channel with valve
70
a. Output port (
72. Fuel supply device
74. Input port (
76. Ignition device (
78. Posterior cover plate (
80. Intermediate partition plate (
82. Anterior cover plate (
A significant feature embodied in this invention is the unusual shape of the engine's working chamber 48. This unique shape has not, to this applicant's knowledge, been discussed in any rotary engine prior art or publication; therefore, it seems necessary to define several terms relating to this invention, namely: “acentric,” “circleoid,” “generating point,” “yousroid,” and “vesica piscis.”
Definition of “acentric:” 1. “Destitute of a centre.” (From: The Oxford English Dictionary, Oxford University Press, second edition, 1991. Vol. 1, pg. 96, col. 2.); 2. “Without a centre.” (From: Shorter Oxford English Dictionary. Oxford University Press, 2007, Vol. 1, pg. 17, col. 2.)
Definition of “circleoid:” “A closed, acentric plane figure resembling a circle.” The invention described in this patent application relates to a particular kind of circleoid, here referred to as a “yousroid.”
The term “generating point” refers to the location from whence the perimeter of a “yousroid,” the chamber in this invention, is drawn. As the center of a circle is the point round which a circle is described by compasses, so the generating point is the location about which a yousroid is described by the pattern-making device detailed below.
Definition of “yousroid:” “An acentric plane figure having a boundary or perimeter in the shape of a circleoid, characterized in that it contains a generating point so that all straight lines drawn through the figure, stretching from boundary to boundary, and also passing through the generating point, will be exactly the same length whether the lines be horizontal, vertical, or at any intermediate angle.”
In this invention, the generating point plays a role in determining the exact location of the power-output shaft's axis. A second characteristic of the generating point is that it divides every straight line of identical length passing through it into two segments. Due to the location of the generating point within the yousroid, one segment is always longer than the other segment. Within an engine setting, one such a line translates into a rotor having unequal segments on either side of the generating point, which when turning, always remains in contact with the opposite boundaries of the yousroid, and always rotates in the direction of the longer segment due to its heavier weight and the resulting leverage. In the accompanying drawings, the rotor will always turn in a clockwise direction.
Definition of “vesica piscis:” “A pointed oval figure typically composed of two intersecting arcs.” (From: Webster's Third New International Dictionary of the English Language, Unabridged, 2002. P. 2546, col. 3.)
In order to determine the precise shape of a yousroid chamber, it was first necessary to invent an instrument that would accomplish the task. The resulting invention that draws a yousroid pattern 30 is presented along with a detailed explanation of its components:
A sheet of Plexiglas, wood or other suitable substance serves as a platform 32 for the device 30. There is a plurality of holes to bolt 32a the large wheel 34 to the platform 32. On the underside of the platform 32 there is a small hole directly under the center point of the small wheel 36.
The large wheel 34 may be variable in diameter and of a visible thickness. The size of the large wheel 34 will ultimately be based upon decisions made concerning the size of the engine chamber 48 because the diameter of this wheel 34 is the main factor determining the size of the pattern drawn on a sheet of paper, vellum, or other suitable drawing surface 32b, and therefore the size of a resulting chamber 48 and most importantly, the consequent power of an engine based on the pattern.
A small wheel 36 is of sufficient thickness to adequately house an aperture 36b or tunnel passing from side to side through its center. The small wheel is positioned on a centered stationary but rotatable support shaft 36a above the large wheel 34 at a previously determined location.
The center 50a of the small wheel 36 must be located within the circumference the larger wheel 34, but in an eccentric position; that is, in any location except the center 34a of the large wheel 34. The exact placement of the small wheel's center support shaft 36a will depend on the compression ratio one wants to achieve. The closer the small wheel 36 is to the center 34a of the large wheel 34, the lower the compression ratio. The further away the small wheel 36 is from the center 34a of the large wheel 34, the higher the compression ratio.
The diameter of the small wheel 36 is less critical than the large wheel's 34 diameter. The small wheel's 36 main function is first, to serve as an anchor for the armature 38 and second, the center 50a of the small wheel will identify the location of the generating point 50 on the yousroid pattern.
An armature 38 made from a rectangular block has a slot 38a on one end holding a permanently mounted ball bearing 42 on a support post 42a, and on the other end, a slot 38b to fit a writing instrument 44 held firmly in place with a hex screw 44a. Inasmuch as the armature 38 sits in the aperture 36b running through the center of the small wheel, it will, when turned, mimic the path of a rotary drive element within a yousroid chamber. The length of the armature 38 is sufficient to extend beyond the perimeter of the large wheel 34 in both directions.
A post 42a is attached to one end of the armature 38 to which a ball bearing 42 has been attached. The ball bearing 42 remains in a stationary but rotatable position, extending just beyond and below the side edge of the large wheel 34, and able to turn as it glides around the rim of the large wheel 34 as the armature 38 is turned.
A spring 40 is attached to the edge of the armature 38 on side holding the ball bearing 42. The other end of the spring 40 is attached to the edge of the small wheel 36. The purpose of the spring 40 is to provide tension and keep the ball bearing 42 in constant contact with the side edge of the large wheel 34 as the armature 38 is turned.
An instrument for writing or drawing 44 is attached to the other end of the armature 38, and a sheet of paper 32b is placed between the large wheel 34 and the platform 32 to capture the chamber pattern drawn using the device 30.
The yousroid-making device 30 is prepared for use as follows: A sheet of paper 32b is placed on the platform 32 of about the same size. The large wheel 34 is then mounted on top of the paper and bolted through the paper to the platform 32. The large wheel 34 remains in a fixed position and does not rotate. The small wheel 36 previously mounted on the large wheel is in an off-center position relative to the center of the large wheel 34. This small wheel 36 will remain stationary in the designated position but will rotate 360°. The armature 38 with the ball bearing 42 on one end is inserted through the tunnel in the center of the small wheel 36. A writing instrument 44 is inserted into the slot 38b on the opposite end of the armature 38, in such a way that the writing instrument's point 44 makes contact with the sheet of paper 32b on the platform 32, with the point 44 hugging the rim of the large wheel 34 so that the pattern drawn will precisely reflect the path of the writing instrument 44.
Throughout the chamber pattern-making process both the large wheel 34 and the small wheel 36 remain in a stationary position. However the small wheel 36 does rotate, and along with it the armature 38, the writing instrument 44, and the ball bearing 42. The armature 38 will trace the path of the first true rotor and thereby define the shape of the chamber 48. Of necessity the armature 38 is longer than an actual rotor because it must extend beyond the circumference of the large wheel 34 on opposite sides in order to support attachments 42 and 44. The segment of the armature 38 that lies between the writing instrument 44 and ball bearing 42 will replicate the path of the eventual rotor 56. As indicated earlier, the large wheel 34 has a noticeable thickness; this thickness allows the ball bearing 42 to move around the outer edge (or rim) of the large wheel 34 without slipping and thereby control the movement of the writing instrument 44 located on the other end of the armature 38. The small wheel 36 contains an aperture 36b running through the side from end to end, and passing through the center. The armature 38 is inserted into this aperture 36b and slides freely: this free movement allows the ball-bearing 42 end of the armature 38 to move around the circumference of the large wheel 34, causing the writing instrument 44 to move and trace a pattern. The distance between the side edge of the ball bearing 42 and the tip of the writing instrument 44 is exactly the same length as the eventual rotor 56.
On the underside of the platform 32 is a small hole at the exact center 50a of the small wheel 36. This precise spot is the generating point 50 for the yousroid chamber 48.
Using
The operator places a sheet of paper 32b between the large wheel 34 and the platform 32, checks to see that the ball bearing 42 and writing instrument 44 are in their proper positions, then turns the armature 38 by hand. The ball bearing 42 and the spring 40 control the path of the armature 38. The path of the ball bearing 42 is determined by its contact with the thick circumferential edge or rim of the large wheel 34. As the armature 38 turns without slipping, the writing instrument 44 begins to trace a pattern on the sheet of paper 32b. When the armature 38 completes one revolution, the writing instrument 44 will have traced a pattern (yousroid) on the paper that becomes the basis for manufacturing the internal shape of the chamber 48 for the rotary engine.
Upon completing the drawing the pattern maker turns the device 30 upside down and makes a mark or indentation on the reverse side of the paper 32b through a small hole 50a under the exact center of the small wheel 36. The use of a transparent material such as Plexiglas as a platform will help if it is necessary to drill a hole. The mark or indentation, while small, should be visible on the obverse side of the paper 32b, along with the yousroid pattern. This location is referred to as the generating point 50, here marking the exact center 50a of the small wheel 36 on the yousroid pattern-making device 30. The generating point 50 is the location where the axis of a power-output shaft 52 must be located. Since the small wheel 36 rotates on its own axis but is otherwise stationary, there can be only one particular location for the placement of a shaft 52. No other location will permit a rotor 56 to rotate on a shaft 52 within a yousroidal chamber 48. This step completes the use of a yousroid-making device 30. The pattern can now be transferred to the appropriate manufacturing equipment to make a yousroid cavity and chamber 48.
This term references the housing 46 that contains a yousroid cavity 48, intake 68 and exhaust 70 channels, a fuel supply 72, and in a gasoline embodiment, an ignition device 76. Two or more outer housings can be linked together to form an extended engine block.
The yousroid cavity 48 is located within the outer engine housing. The terms “cavity” and “chamber” refer to exactly the same space within the outer housing 46, with the refinement being that the cavity becomes a yousroid chamber 48 when it is sandwiched between two of the three plates (anterior 82, intermediate 80, or posterior 78). The height, width, depth, and therefore the volume of the chamber 48 are engineering and manufacturing decisions.
This invention features an inner body, often referred to as a rotational body, or simply as a rotor 56, being of a substantially vesica piscis profile, having two-apices 60 and 62, and two convex faces 64 and 66, each face functioning as a piston. At each apex there will be a prior art sealing mechanism (not shown) that pushes a seal against the wall of the chamber 48 to create an airtight fit. The apex seals are in slidable contact with the yousroid chamber wall 48c of the rotor housing 46. The yousroid chamber wall 48c of the rotor housing 46, the inner surface of the intermediate partition plate 80, the inner surfaces of the anterior plate 82 and/or posterior plate 78 and rotor faces one 64 and two 62 define two working sub-chambers 48a and 48b within the yousroid chamber 48.
Referring to
The rotor 56 will contain at least one oil passageway (not shown) that will lubricate the seals (not shown) on the apices 60 and 62 with oil entering into the passageway from the power-output shaft 52.
The rotor 56 will sit on a rectangular segment 54 of the shaft 52 (
4. An Air Intake Channel with Valve
In a diesel or a gasoline embodiment of this invention, an air-intake channel with valve 68 is located in the wall of a stationary yousroid chamber and rotor housing 46 just below the horizontal position of a rotor 56, as shown in
In place of an air-intake channel with valve, certain embodiments that do not function as internal combustion engines, such as a compressed air motor, a hydraulic motor, a steam engine, a hydraulic pump, an air pump, a fluid pump and a fuel pump among others, may require an input port 74, as shown in
Diesel and gasoline embodiments of this invention require a fuel supply device 72 such as a fuel injector. Referring to
7. An Exhaust Channel with Valve
Referring to
In pump and non-combustive motor applications, gases and fluids are removed through an output port 70a. The disposal of these gases and fluids once they exit the yousroid chamber 48 will be accomplished through the use of prior art technology. This output port will be based on prior art. It is referenced abstractly in the
A gasoline embodiment of this invention requires an ignition device 76. The ignition device may consist of any suitable method to ignite the fuel in the yousroid compression/combustion sub-chamber by means of an electrical spark or heat. Referring to
The power-output shaft 52 on the current invention is a cylindrical rotating rod containing straightforward, simple shaft construction in comparison with a crank or eccentric shaft. The shaft will pass through the posterior plate 78, yousroid chamber and rotor housing(s) 46, intermediate plate(s) 80, and anterior plate 82 at the location designated as the “generating point” 50 in
The power-output shaft 52 will contain appropriately placed essentially rectangular segments 54 upon which each rotor 56 is located. This rectangular segment 54 is a little larger than the shaft 52 itself. The shaft 52 can be machined so that the cylindrical portions are slightly smaller than the rectangular segments 54, thereby facilitating the placement of the rotor(s) 56 on the shaft. As mentioned above, the two-apex rotor 56 is designed with an aperture 58 running lengthwise that fits onto the shaft 52 and allows sufficient additional clearance for rotor 56 movement. With this construction, the rotor 56 will continuously adjust its position on the shaft 52 as required when the rotor 56 passes through the wider and narrower areas of the chamber 48. Furthermore, this arrangement will allow both ends of the rotor 56 to remain in tight contact with the yousroid chamber wall 48c. The power-output shaft can be a single unit, or comprised of a multiplicity of coupled shafts.
The power-output shaft will have a system (not shown) external to the shaft that provides a cooling medium and a lubrication medium to channels (not shown) in the shaft. An appropriate cooling and lubrication media can enter the portions of the shaft on which the rotor sits via small channels (not shown) in the rotor. The lubrication medium will move by centrifugal force into the opposite ends of the rotor and passing through small channels, will cool and lubricate the rotor seals. The shaft will sit on a plurality of sleeve bearings (not shown), and will be cooled and lubricated by an appropriate medium via channel(s) (not shown) inside the shaft.
This compression ratio in this invention can be adjusted in two ways: First by changing the distance between the center point of the large plastic wheel 34 and the center point of the small wheel 36 on the yousroid pattern-making device 30, and second, by making the two faces of the rotor 56 either more convex, or less convex. From this perspective, a rotor 56 substantially in the shape of a vesica piscis is superior to the traditional triangular rotor because it produces higher torque. The symmetric curves connecting the two apices can be fine tuned and calibrated to eliminate the problem of poor compression ratio inherent in the Wankel design. The more convex the rotor 56, the higher the compression ratio; the less convex the rotor 56, the lower the compression ratio. Furthermore, this two-apex rotor 56 can be designed and built to combust diesel fuel whereas the Wankel engine has not been successful in a diesel engine configuration. Cold starting a low compression ratio diesel Wankel is another problem, even with a heat input aid. However, the engine described in this document will have a high compression ratio and therefore the problems inherent in Wankel diesel engines will be successfully resolved. The same techniques used to start other diesel engines will be applied to starting this engine. There will be an external electric starter (not shown) and any additional prior art technology required by the manufacturer.
It is anticipated that embodiments of the present invention will offer a virtually vibration-free performance. Chamber and rotor will function almost as smoothly as an electric motor because there is no oscillation of any kind, and the internal wall of the chamber comes as close as possible to approximating a smooth circular chamber and still accommodate a spinning rotor without the need for any vibration-inducing impediments.
A diesel engine embodiment will consist of an outer housing, yousroid chamber, rotor, power output shaft, air intake and exhaust channels configured as shown in
All of the characteristics of a diesel embodiment described above under
The following commentary, along with
It is understood that all drawings cited above are illustrative only, and should not be construed as defining the scope and limits of the invention as to which reference should be made to the section detailing claims and their legal equivalents, rather than by the examples given. Furthermore, the specific examples mentioned above are illustrative of some of the various feasible embodiments of this invention. It is also understood that this invention is capable of mechanical alteration and adaptation without departing from the spirit and scope of the invention.
This application claims the benefit of U.S. provisional patent application Ser. No. 61/269,756 filed Jun. 30, 2009 titled “Rotary Internal Combustion Diesel Engine” by the present inventor.
| Number | Date | Country | |
|---|---|---|---|
| 61269756 | Jun 2009 | US |
