Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| D634295 | Key extension module for telephone | 03/15/2011 |
| D583353 | Console for telephone | 12/23/2008 |
| D573974 | Expanding terminal | 07/29/2008 |
| 4385212 | Expandable communication terminal housing An expandable telephone housing has been developed which allows for easy lateral expansion. The housing contains front and rear slides and an end cap which is removable. For expansion the end cap is removed exposing a mating mechanism for locking to an ex... | 05/24/1983 |