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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6065460 | Dual-pressure electronic paintball gun A gas-powered paintball gun has two pressure regulators which supply two different gas pressures for gun operation: a lower-pressure gas for quickly but gently loading balls into the chamber of the gun, and a high-pressure gas for consistently and efficie... | 05/23/2000 |
| 5878736 | Dual-pressure electronic paintball gun A gas-powered paintball gun has two pressure regulators which supply two different gas pressures for gun operation: a lower-pressure gas for quickly but gently loading balls into the chamber of the gun, and a high-pressure gas for consistently and efficie... | 03/09/1999 |
| 5868637 | Sport or games apparatus Apparatus for playing a sport or game, comprises a plurality of elongate members disposed upon a playing surface, at least some of said elongate members comprising tubular members, some of said tubular members being disposed in a vertical disposition and ... | 02/09/1999 |
