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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7121232 | Method in an internal combustion engine and an internal combustion engine An internal combustion engine, Z-engine. The compression part and the working part are separated. New gas is transported to the upper side of the piston. Below there is a small chamber corner. When the piston comes nearer the upper hollow part, the combustion gases ... | 10/17/2006 |
| 6739292 | Two-stroke internal combustion engine with air injection system An improved two-stroke internal combustion engine is disclosed. The engine includes a cylinder having a cylindrical inner wall, a piston in the cylinder, and a cylinder head mounted atop a top end of the cylinder. The cylinder head includes a lower surface, at least... | 05/25/2004 |
| 6170444 | Air and exhaust gas management system for a two-cycle internal combustion engine The air and exhaust gas management (scavenging) system for a two-cycle internal combustion engine allows the engine to perform comparably to similar four-cycle engines, while remaining lighter, simpler and more cost-effective than its four-cycle counterpa... | 01/09/2001 |
| 4359017 | Internal combustion engine An internal combustion engine operating on a two-stroke cycle and including a piston 1 reciprocable in a cylinder 2 to drive a crank shaft and also to inhale and compress a volume of air is characterized by a second piston 15 working in a separate cylinde... | 11/16/1982 |
| 4276858 | Two-cycle internal combustion engine A two-cycle internal combustion engine includes a power cylinder, a drive piston being positioned therein. A first transfer duct extends between an auxiliary cylinder, which is supplied with carburetted air and the power cylinder and opens thereinto via a... | 07/07/1981 |
| 4016839 | Method for fueling combustion engines The invention relates to internal combustion engines of the reciprocal type, and more particularly to such engines in which the pressure for Diesel operation can be attained, or in which the power output of an Otto-cycle engine can be increased. The prese... | 04/12/1977 |
| 3938481 | Two-stroke internal combustion engine The invention relates to internal combustion engines of the reciprocal type, and more particularly to such engines in which the pressure for Diesel operation can be attained, or in which the power output of an Otto-cycle engine can be increased. The prese... | 02/17/1976 |
