| Patents for G04C 21 - Producing acoustic time signals by electrical means (1,026) |
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| 04/05/1977 | US4015417 Alarm time setting notifying mechanism for a clock or the like |
| 01/25/1977 | US4004408 Mechanical improvement on an electric alarm clock |
| 12/28/1976 | US4000384 Unlocking mechanism |
| 12/21/1976 | US3998045 Talking solid state timepiece |
| 12/14/1976 | US3996734 Minute-interval alarming device for a clock or the like |
| 09/28/1976 | USRE28985 Alarm clock timer with manually operable reset mechanism |
| 09/21/1976 | US3981139 Self contained battery operated clock fabricated on a single printed circuit board |
| 08/31/1976 | US3978296 Switching system for an electronic timepiece |
| 08/31/1976 | US3977291 Attenuator network for musical instrument keying system |
| 08/31/1976 | US3977177 Electric alarm watch |
| 08/24/1976 | US3975896 Switching device for electronic timepiece |
| 07/27/1976 | US3971207 Packing means for a watch |
| 07/13/1976 | US3968900 Timed medicant dispensing device |
| 06/29/1976 | US3967078 Time switch mechanism |
| 06/01/1976 | US3961327 Audible alarm for a synchronous motor |
| 05/11/1976 | US3956597 Speaking time keeper |
| 05/04/1976 | US3953965 Digital clock |
| 04/20/1976 | US3952177 Timer for multi-purpose use |
| 04/06/1976 | US3949240 Switching circuit for power supply to electronic apparatus |
| 03/23/1976 | US3946314 Remote control programming system |
| 03/16/1976 | US3943700 Large-sized clockwork with an electrically driven striking train |
| 02/10/1976 | US3938047 Control circuit for use with amplifier |
| 01/20/1976 | US3934120 Device for electroconductive connection and reading |
| 01/06/1976 | US3931621 Variable amplitude timed alarm system |
| 01/06/1976 | US3930360 Alarm clock timer |
| 01/06/1976 | US3930358 Alarm clock timer |