Patents for G04G 13 - Producing acoustic time signals (1,738) |
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07/11/1978 | US4099371 Electronic optical display alarm timepiece |
07/04/1978 | US4098071 Time signal clock |
06/27/1978 | US4097905 Tape player time signal |
06/20/1978 | US4095411 Electronic wristwatch having an alarm device |
06/20/1978 | US4095410 Alarm electronic timepiece |
06/06/1978 | US4093992 Electronic wristwatch |
05/30/1978 | US4091611 Digital alarm watch |
05/23/1978 | US4090349 Electronic music box circuit |
05/16/1978 | US4089159 Electronic timepiece |
03/14/1978 | US4078376 Electronic watch having optical and audible readouts and alarm and stopwatch capabilities |
02/21/1978 | US4074516 Alarm electronic timepiece |
02/14/1978 | US4074251 Appointment reminders |
02/14/1978 | US4073133 Electronic chime and strike system |
01/24/1978 | US4070697 Appointment calendaring clock |
01/24/1978 | US4070649 Multi-modal data input/output apparatus and method compatible with bio-engineering requirements |
01/17/1978 | US4068461 Digital electronic alarm watch |
12/06/1977 | US4060973 Automatic variable-sound alarm clock |
10/25/1977 | US4055843 Annunciator for use with electronic digital clock |
09/13/1977 | US4047377 Sleep-inducing/interrupting audio system |
08/09/1977 | US4040248 Alarm electric watch |
07/26/1977 | US4038561 Children's lamp |
06/28/1977 | US4031711 Cold air blast wake-up apparatus |
06/28/1977 | US4031693 Electronic digital clocks |
04/05/1977 | US4016562 Switch-off device for electrically operated clock alarm and control therefor |
02/01/1977 | US4005571 Elapsed time reminder with conversion of calendar days into elapsed time |
01/25/1977 | US4004409 Watch having a piezo electric buzzer mechanism |
12/21/1976 | US3999050 Electronic diary |
12/21/1976 | US3998045 Talking solid state timepiece |
09/21/1976 | US3981139 Self contained battery operated clock fabricated on a single printed circuit board |
09/14/1976 | US3980868 Digital yacht racing timing system |
08/24/1976 | US3975896 Switching device for electronic timepiece |
07/20/1976 | US3969886 Digital electronic watch for displaying both time and the time remaining within a preselected time period |
04/06/1976 | US3949303 Time controlled switching arrangement for two timer radio receiver |
03/30/1976 | US3946549 Electronic alarm watch |
03/02/1976 | US3940919 Electronic wristwatch with electronic sound emitter device |
02/17/1976 | US3938317 Serial time read out apparatus |
02/10/1976 | US3937004 Portable miniature type information treating device |
01/06/1976 | US3931621 Variable amplitude timed alarm system |