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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 5836533 | Hybrid arm-position/tape-tension servocontrol system Servomechanisms (58 and 60) control a takeup reel (12) and a tension arm (16) in a cassette recorder. The servomechanisms receive control signals (54 and 56) generated in accordance with respective control functions, each of which includes a respective co... | 11/17/1998 |
| 5774311 | Small core magnetic head with non-magnetic side support A head having very low leakage flux loss since the head is constructed with a very small elongate magnetic intercore, having a winding window formed therein if desired, with the intercore being supported on either side by non-magnetic side support blocks.... | 06/30/1998 |
| 5748192 | Video special effects system with graphical operator interface A video special effects system and method includes at least one signal system operating in real time to transform one or more input video signals to generate an output video in response thereto, a work station, an operator control panel and a control syst... | 05/05/1998 |
| 5742295 | Video special effects system with graphical operator interface A video special effects system and method includes at least one signal system operating in real time to transform one or more input video signals to generate an output video in response thereto, a work station, an operator control panel and a control syst... | 04/21/1998 |
