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| Number | Title | Issue Date |
| 7255072 | Two-stroke internal combustion engine In a two-stroke internal combustion engine (1) using an internal cooling piston (2), the piston (2) has in-piston scavenging passages (19) defined therein by partition walls (18), and lower-end inlets (20) of the in-piston s... | 08/14/2007 |
| 7117827 | Means for treatment of the gases of combustion engines and the transmission of their power The disclosure relates to fluid working devices including reciprocating internal combustion engines and pumps. A number of arrangements for pistons and cylinders of unconventional configuration are described, mostly intended for use in IC engines operating without c... | 10/10/2006 |
| 7025021 | Two-stroke internal combustion engine Crankcase scavenged two-stroke internal combustion engine (1), in which a piston ported air passage is arranged between an air inlet (2) and the upper part of a number of transfer ducts (3, 3′). The air inlet is equipped with a restriction val... | 04/11/2006 |
| 4838216 | Four cycle, dual piston internal combustion engine and pump An internal combustion engine having a bi-diameter or stepped piston configuration. The piston having a smaller upper piston portion and a larger lowre piston portion. A pumping chamber is formed in part by the larger lower piston portion separate from ea... | 06/13/1989 |
| 4836150 | Combined fluid pump and two-cycle, internal combustion engine An internal combustion engine having a bi-diameter or stepped piston between a combustion chamber and crankcase. Piston outlet means is provided in the smaller upper piston portion which permits mixture from the crankcase to pass through to a mixture chan... | 06/06/1989 |
| 4218888 | Impact device An automatic impact delivering device or tool of the internal combustion type having a self-contained fuel supply, wherein: 1. valving is an integral function of the piston; 2. a pre-compression chamber and a combustion chamber are provided in the same structu... | 08/26/1980 |
