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| Number | Title | Issue Date |
| 4700667 | Internal combustion engine A two-stroke internal combustion engine having at least two cylinders which are aligned, each cylinder having a piston. The pistons are rigidly attached to each other by means of a piston rod which is provided with a carrier and exhaust valves, the valves... | 10/20/1987 |
| 4218994 | Fluid intake and exhaust assemblies for positive displacement apparatus Disclosed are intake and exhaust assemblies for forced air intake, reciprocating piston, internal combustion engine. Alternate embodiments of the air intake valve assembly include a hollow tube defining the intake port with means operatively coupling the ... | 08/26/1980 |
