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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4361741 | Switch actuator apparatus This invention relates to an apparatus (40,122) for actuating an electrical switch (42,124) which eliminates the problems of over stressing and inadvertent cyclical actuation of the switch (42,124) and flexing of electrical connecting wires (66,168). The ... | 11/30/1982 |
| 4214150 | Electric heating elements An electric heating element for the top panel of a cooking stove, having terminals adapted to be plugged into a terminal block carried by the stove panel, and embodying means for automatically interrupting current flow to the heating element when a cookin... | 07/22/1980 |
| 4200777 | Pressure switch A pressure switch wherein a resiliently yieldable intermediate open layer is sandwiched between flexible conductive layers, all of which is enclosed between flexible outer layers, so that in the unstressed or relatively unstressed condition the contact la... | 04/29/1980 |
| 4137116 | Method of making a pressure switch A pressure switch and method of manufacture wherein a resiliently yieldable intermediate open layer is sandwiched between flexible conductive layers, all of which is enclosed between flexible outer layers, so that in the unstressed or relatively unstresse... | 01/30/1979 |
| 4075443 | Cushion spring safety system A system for disabling or neutralizing a vehicle when less than a predetermined force is exerted upon the spring assembly of the operator's seat of such vehicle. A contact plate is mounted directly upon the spring assembly interiorly of the padding and ou... | 02/21/1978 |
| 4001777 | Taximeter protection system A monitoring system for a vehicle for hire, such as a taxicab, including a source of direct current, electrically controlled switching means in the form of a relay, and condition responsive switching means connected to the source and to the relay. The con... | 01/04/1977 |
| 3946178 | Device for indicating the presence of a load on a vehicle seat A device for indicating the loading of a seat, particularly an automobile passenger seat, comprises a seat having a spring suspension with a pull switch mounted on a rigid plate held to the underside of the suspension. The pull switch includes an actuatin... | 03/23/1976 |
| 3940581 | Switch construction, particularly for indicating automobile seat loading A switch, particularly one for indicating whether an automobile seat is occupied or unoccupied, comprises a switch housing with a spring contact secured at a base portion to respective side walls of the housing and extending inwardly from the respective s... | 02/24/1976 |
