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| Number | Title | Issue Date |
| 6935285 | Two-cycle combustion engine having two-staged piston A two-cycle combustion engine having a two-staged piston, is simple in structure and inexpensive and addresses a undesirable blow-off phenomenon of the air-fuel mixture. The two-cycle combustion engine includes a cylinder block having a two-staged cylinder bore with... | 08/30/2005 |
| 6904878 | Internal combustion engine with novel fuel/air delivery system Blower forces fuel/air mixture into bore of cylinder head against small diameter piston of compound piston assembly, forcing assembly down in engine cylinder, permitting fuel/air mixture to enter main cylinder of engine in which it is ignited. Exhaust forces assembl... | 06/14/2005 |
| 5870980 | Stepped piston internal combustion engine A stepped-piston, internal-combustion engine includes at least one cylinder, each cylinder having a working part of lesser diameter defined by a cylindrical wall and a pumping part of greater diameter, a piston slidable in each cylinder, a receiver which ... | 02/16/1999 |
| 5857450 | Low emission two cycle engine using two segment piston An internal combustion engine is provided with a top hat piston disposed in a cylinder having first and second portions of different diameters. The piston, with first and second portions of different diameters, is disposed within the cylinder and defines ... | 01/12/1999 |
| 5540195 | Vuka two-stroke engine An improved two-stroke internal combustion engine utilizing a vacuum chamber to create vacuum, which sucks the exhaust out from the combustion chamber, and forces the charge into it.... | 07/30/1996 |
| 5189995 | Stepped piston engine A stepped piston engine comprises first (10), second (11) and third (12) stepped cylinders, each cylinders (10,11,12) having a larger diameter pumping part (10p,11p,12p), and a smaller diameter working part (10w,11w,12w), and a piston (13,14,15) slidable ... | 03/02/1993 |
| 5115768 | Combustion engine for hydrogen In order to improve a combustion engine for hydrogen comprising a main piston which is displaceable in a main cylinder in a stroke direction between a top dead center, forming a minimum main cylinder chamber with the main cylinder, and a bottom dead cente... | 05/26/1992 |
| 5009207 | Internal combustion engine An internal combustion engine has a pair of first and second cylinders (12,14) communicating with a combustion chamber (20) the first cylinder having a larger swept volume than the second cylinder. First and second pistons (16,18) are provided in the cyli... | 04/23/1991 |
| 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 |
| 4781153 | Internal combustion engine An internal combustion engine has a pair of stepped cylinders (14,15) in which stepped pistons (P1,P2) are received, each cylinder (14,15) and piston (P1,P2) having a pumping part of larger diameter and a working part of smaller diameter transfer paths fr... | 11/01/1988 |
| 4586465 | Internal combustion engine An internal combustion engine has a cylinder with a porting ring adjacent the cylinder head to reduce the diameter of the cylinder. The piston in the cylinder has a reduced diameter crown portion complementary to the porting ring and an upper face on the ... | 05/06/1986 |
| 4478180 | Crankchamber precompression type two-cycle internal combustion engine A crankchamber precompression type two-cycle internal combustion engine including cylinder assemblies of an even number consists of at least one pair of cylinder assemblies having working cycles with 180° phase difference, each cylinder assembly having a... | 10/23/1984 |
| 4138971 | Crankchamber precompression type two-cycle internal combustion engines Twin cylinder two cycle engine including a pair of stepped cylinders and a pair of stepped pistons slidable in said cylinders defining annular spaces of variable volume in said cylinders. The pistons are interconnected each other with 180° phase differen... | 02/13/1979 |
| 4070999 | Gasoline engine of four-cycle spark ignition type A gasoline engine of four-cycle spark ignition type comprises a piston-cylinder assembly having a piston including a partition and a combustion chamber separated into two compartments by the partition in the forward portion of the piston reciprocation, an... | 01/31/1978 |
| 4069794 | Positive power control internal combustion engine The two-stroke engine has a piston mounted in a cylinder having a full diameter bore throughout its major length and a reduced diameter upper bore portion. The piston has the same configuration and in its upward compression stroke, air and finely-divided ... | 01/24/1978 |
