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