| Patents for G04C 21 - Producing acoustic time signals by electrical means (1,026) |
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| 12/07/1982 | US4362400 Timepiece with alarm function including annular diaphragm to accommodate battery |
| 12/07/1982 | US4362399 Circuit for an electronic clock having a parallel-connected alarm device and stepper motor |
| 11/09/1982 | US4358838 Electronic timepiece with a time striking device |
| 09/28/1982 | US4352170 Alarm deactivation system employing timed manual switch operation |
| 09/28/1982 | US4352169 Electronic timepiece |
| 09/21/1982 | US4351043 Time detecting switch for an alarm clock |
| 09/21/1982 | US4351041 Acoustic alarm device for watches |
| 09/15/1982 | EP0060216A1 Timepiece including a release mechanism |
| 09/15/1982 | EP0060215A1 Timepiece including a modular release mechanism |
| 05/18/1982 | US4330878 Sound producing device for watches |
| 05/04/1982 | CA1123032A1 Timing mechanism with two separate programs operating separate switch actuators and having an alarm system |
| 04/20/1982 | CA1122019A1 Timepiece with electronic chime generator |
| 02/16/1982 | US4316273 Remote-controlled alarm clock |
| 12/09/1981 | EP0041245A1 Electronic time piece including an electro-acoustic transducer |
| 12/01/1981 | US4303997 Analog alarm timepiece |
| 11/03/1981 | US4298973 Structure for coupling back cover with case band in wrist watch |
| 11/03/1981 | US4298972 Alarm signaling time detecting device for leaf type digital clock |
| 10/06/1981 | US4293938 Alarm signaling time detecting device for digital clock |
| 09/01/1981 | US4287586 Signaling time detecting device for leaf type digital clock |
| 08/11/1981 | US4283782 Alarm timepiece |
| 08/04/1981 | US4282593 Electronic clock circuitry for a clock having chimes or an alarm |
| 06/30/1981 | US4276625 Bell-striking clock |
| 06/02/1981 | US4271498 Watch |
| 05/26/1981 | US4270200 Timed chime system |
| 05/26/1981 | US4270195 Alarm setting indication device for digital clock |
| 05/13/1981 | EP0028429A1 Watch with an electro-acoustic warning device |
| 05/05/1981 | US4266288 Electronic timepiece |
| 04/22/1981 | EP0027288A1 Electronic watch with stepping motor and alarm circuit |
| 03/24/1981 | US4258432 Electro-acoustic device for alarm watch |
| 02/24/1981 | US4253172 Electronic timepiece or analog type |
| 02/17/1981 | US4251878 Switching device for battery powered alarm clock |
| 02/10/1981 | US4250573 Digital alarm wristwatch |
| 01/27/1981 | US4247933 Time striking device for timepiece |
| 01/06/1981 | US4244041 Electronic timepiece with an alarm device |
| 01/06/1981 | US4244039 Electro-mechanical watch |
| 12/30/1980 | US4242746 Timing mechanism with two separate programs operating separate switch actuators and having an alarm system |
| 12/30/1980 | US4242745 Electronic timepiece with electroacoustic transducer |
| 12/23/1980 | US4241441 Electronic timepiece |
| 11/18/1980 | US4234945 Electronic timepiece with hourly strike mechanism |
| 11/18/1980 | US4234944 Alarm electronic timepiece |
| 11/11/1980 | US4233679 Adjustable piezoelectric transducer for a watch |
| 11/11/1980 | US4232511 Time detecting device for a clock |
| 11/04/1980 | US4232241 Electric circuit for driving a piezoelectric vibrator |
| 10/28/1980 | CA1088326A1 Electronic alarm timepiece with independent alarm actuation |
| 08/26/1980 | US4218875 Alarm |
| 08/12/1980 | US4216647 Electronic timepiece |
| 07/22/1980 | US4214134 Time detecting switch for alarm clock |
| 07/22/1980 | US4213291 Alarm clock construction |
| 07/15/1980 | US4212155 Time detecting switch for clock |
| 07/15/1980 | US4212154 Time striking device for electronic timepiece |
| 07/08/1980 | US4211064 Time signal timepiece |
| 07/01/1980 | US4209969 Alarm clock |
| 06/24/1980 | US4208866 Electronic timepiece equipped with alarm |
| 06/24/1980 | CA1079987A1 Digital electronic alarm timepiece |
| 06/17/1980 | CA1079532A1 Alarm switch and alarm set device |
| 06/11/1980 | EP0011636A1 Clock with striking mechanism |
| 06/10/1980 | US4206590 Electronic wristwatch case |
| 06/03/1980 | US4205519 Electronic time-piece with acoustic signal, for signalling a particular working mode |
| 06/03/1980 | US4205517 Alarm electronic timepiece |
| 05/20/1980 | US4203279 Timepiece which permits freely adjusting the level of sounds produced therein and given out thereof |
| 05/20/1980 | US4203278 Alarm electronic timepiece |
| 04/29/1980 | US4199930 Alarm switch for an alarm circuit in a horological device |
| 04/08/1980 | US4196583 Analogue electronic alarm timepiece |
| 04/02/1980 | EP0009280A1 Medicine box incorporating a warning device |
| 03/18/1980 | US4193256 Digital clocks provided with time switch mechanisms |
| 03/04/1980 | CA1072750A1 Electronic timepiece with single push button cam operated switching |
| 01/01/1980 | US4180970 Wristwatch with sound-making device |
| 12/11/1979 | US4178592 Fire alarm having a sensor on an extensible arm |
| 12/11/1979 | CA1067708A1 Talking solid state timepiece |
| 11/15/1979 | WO1979000965A1 Clock with striking mechanism |
| 10/30/1979 | US4172358 High accuracy timer actuating mechanism in a leaf type digital clock |
| 09/18/1979 | US4167849 Watch with electronic buzzer |
| 07/24/1979 | US4162417 Electromechanical escapement |
| 06/26/1979 | US4159472 Electronic buzzer |
| 06/12/1979 | US4157646 Alarm switch and alarm set device |
| 05/08/1979 | US4152887 Digital electronic alarm timepiece |
| 04/10/1979 | US4148182 Buzzer mechanism for alarm clock or the like |
| 04/03/1979 | US4147899 Broadband electromagnetic sound source with differently tuned diaphragms |
| 02/06/1979 | US4137703 Timer device |
| 01/23/1979 | US4135359 Electronic timepiece with the amending means |
| 10/31/1978 | US4122660 Snow alarm |
| 10/24/1978 | US4122365 Piezoelectric buzzer device |
| 10/24/1978 | US4121413 Battery operated electric clock with improved casing |
| 09/05/1978 | US4110969 Digital electronic alarm timepiece |
| 08/08/1978 | US4104862 Apparatus for generating an alarm sound |
| 06/20/1978 | US4095411 Electronic wristwatch having an alarm device |
| 05/16/1978 | US4090041 Electromagnetic sonic generator for an alarm |
| 04/11/1978 | US4084104 Electric signaling arrangement for delivery of waking signals |
| 03/21/1978 | US4079581 Alarm device for clocks |
| 02/14/1978 | US4073130 Chime clock with minute hand shaft rotatable in both directions |
| 01/31/1978 | US4070822 Timer mechanism for use in a clock |
| 01/24/1978 | US4069658 Alarm setting device for timepieces |
| 11/15/1977 | US4057957 Alarm device of clocks |
| 09/06/1977 | US4045954 Safety mechanism for a watertight watch having a piezo electric buzzer |
| 08/30/1977 | US4045627 Switching mechanism for alarming time detection in an alarming device |
| 08/23/1977 | US4044229 Device for electroconductive connection and reading |
| 07/26/1977 | US4038561 Children's lamp |
| 07/19/1977 | US4036004 Clock with striking mechanism |
| 06/14/1977 | US4028882 Awakening system with means adapted to relax tense muscles |
| 04/05/1977 | US4016562 Switch-off device for electrically operated clock alarm and control therefor |