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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 5074821 | Character animation method and apparatus A voice track is recorded on one track of a dual track recording device, typically a tape recorder. On a second track of the recorder an animation signal is recorded characterized by the signal having a frequency at any given time indicative of the then c... | 12/24/1991 |
| 4855827 | Method of providing identification, other digital data and multiple audio tracks in video systems A method and apparatus for imbedding digital data and multiple audio (analog) track information in a video signal in a manner compatible with ordinary broadcast TV and transparent to a conventional television receiver is disclosed. The method and apparatu... | 08/08/1989 |
| 4839743 | Interactive video and audio controller An interactive video controller 10 for selecting between two or more tracks of video data responsive to the input of a player and for displaying the selected video track. The interactive video controller 10 displays and stores the selected track and then ... | 06/13/1989 |
| 4696653 | Speaking toy doll A toy doll which responds with spoken words and/or sentences to the touching of selected portions of the doll by a user and/or voice actuation by the user is described. Specific areas of the doll, such as eyes, ears, nose, etc. are provided with touch swi... | 09/29/1987 |
