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| Number | Title | Issue Date |
| 4964379 | Twin-piston two-stroke engine Two pistons in adjacently situated cylinders in a twin-piston two-stroke engine share a common combustion chamber. To ensure low exhaust gas emissions with low consumption, a lean mixture is burnt whereof the complete combustion is made possible by design... | 10/23/1990 |
| 4414927 | Two stroke oscillating piston engine A two stroke oscillating piston engine comprising cylinder sections provided with feed chambers for additional fresh air. The two outer rings, acting as pistons, draw in fresh air through intake ports and force that air to enter combustion chambers throug... | 11/15/1983 |
| 4407240 | Opposed piston internal combustion engine with special scavenging means A reciprocating piston machine comprising a main piston secured to a piston rod, a cylinder in which the main piston can slide, the main piston and cylinder defining a combustion chamber, a scavenging plate disposed in the combustion chamber and axially m... | 10/04/1983 |
| 4185597 | Self-supercharging dual piston engine apparatus Internal combustion engine apparatus includes a dual piston with a plurality of intake ports having reed type check valves.... | 01/29/1980 |
| 3981280 | Two-stroke combustion engines A two-stroke combustion engine with intake and exhaust ports which are indirectly or directly controllable in accordance with the reciprocating motion of a working piston in a cylinder space, wherein at one side of the piston there is a working chamber ac... | 09/21/1976 |
