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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6955145 | Methods and apparatus for receiving excessive inputs in a VCT system A method that provides increased flexibility to measure dynamic range of a rotating system is provided. The method includes the steps of: providing a first rotating member; providing a second rotating member suitably engaged to the first rotating member; providing a... | 10/18/2005 |
| 4167119 | Apparatus for measuring frequency of rotation of a shaft An apparatus for measuring frequency of rotation of a shaft, connectable to his shaft through a reducing gear having a solenoid clutch at the output thereof, has the output shaft of this solenoid clutch associated with a driver and a return spring. The dri... | 09/11/1979 |
| 4027144 | Magnetic return mechanism An improved magnetic return mechanism, especially useful in timing devices of the type including a motor means for driving a member at a given rotational velocity about a given axis and from a selected angular position, means for indicating when the membe... | 05/31/1977 |
| 4021046 | Accumulative comparative timing device A timing device including an internal motor which rotates a pointer on an elapsed time dial which indicates the time periods required for the performance of respective events and for indicating the differences between the time periods when each time perio... | 05/03/1977 |
| 4005819 | Magnetic return mechanism An improved magnetic return mechanism, especially useful in timing devices of the type including a motor means for driving a member at a given rotational velocity about a given axis and from a selected angular position, means for indicating when the membe... | 02/01/1977 |
| 3999705 | Magnetic return device for reset timer/counter unit and reset timer/counter unit using same A device adapted for special use in a reset timer/counter unit to return various digital counting subwheels to their reset condition after a timing or counting cycle. The device includes a first ring formed from a permanently magnetizable material having ... | 12/28/1976 |
| 3993895 | Magnetic return device for reset timer/counter unit and reset timer/counter unit using same A device adapted for special use in a reset timer/counter unit to return various digital counting subwheels to their reset condition after a timing or counting cycle. The device includes a first ring formed from a permanently magnetizable material having ... | 11/23/1976 |
| 3931705 | Counter feed mechanism as used in digital clock The present invention relates to a counter feed mechanism as used in digital clock comprising a cam member adapted for advanced rotation and another cam member adapted for delayed rotation both arranged on a common axis so that the advanced rotation of th... | 01/13/1976 |
