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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6347137 | Methods and apparatus for requesting assistance at a self-checkout terminal The present invention provides a self-checkout terminal having input and output devices for performing a self-checkout process. The input and output devices are controlled and monitored by system software that determines, based on its monitoring of the in... | 02/12/2002 |
| 6226370 | Telephone pager and intercom system A pager system connectable to the existing telephone wiring for activation through the normal residential DTMF telephone instruments, the system including a plurality of pager devices, each connected to the phone line between the tip and ring wires, and e... | 05/01/2001 |
| 5940486 | Two-way communication system with selective muting A bidirectional communication channel provides communication across a sound proof wall used, for example in a ticket booth. Normally communication from outside into the booth is muted by inhibiting the gain of a listen channel to a preselected percentage ... | 08/17/1999 |
| 4049911 | Talk-through unit with voice controlled switching with turn off delay variable from 250-500 milliseconds depending on voice amplitude There is disclosed a compact battery-powered, self-contained talk-through unit for passing voice communications through a partition. Typically, the unit is installed in a window partition separating an attendant from the public. Facing the outside of the ... | 09/20/1977 |
| 3999015 | Aircraft multi-communications system An aircraft communication system adapted to provide a plurality of communication paths from respective inputs to a plurality of outputs, the communication paths being flexible in arrangement and operator control. For use in an aircraft, the system combine... | 12/21/1976 |
