| Patents for G04C 21 - Producing acoustic time signals by electrical means (1,026) |
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| 06/28/1989 | CN2040264U Fully-automatic music alarm clock |
| 05/10/1989 | CN2037485U Music alarm clock |
| 04/12/1989 | CN2035897U Music alarm clock |
| 03/29/1989 | CN2035105U Sound volume light-controlled electronic time giving clock |
| 03/15/1989 | CN2034296U Keyboard type quartz clock with wide time domain timing and memorization |
| 01/17/1989 | US4799204 Alarm stop device for a timepiece |
| 01/04/1989 | CN2030342U Multifunctional quartz electronic clock |
| 12/14/1988 | CN88200267U Music alarming clock |
| 12/07/1988 | CN88201324U Multi-functional language time signal machine |
| 11/29/1988 | US4788669 Electronic timepiece |
| 10/25/1988 | US4780583 Rotatable circular switch |
| 10/12/1988 | CN87216934U Programmable clock |
| 10/12/1988 | CN87209779U Control unit of music clock and household electric appliance |
| 09/28/1988 | CN87216137U Dual track famous music time-giving clock without time-giving at night |
| 09/07/1988 | CN87214623U Domestic clock with chinese languge time signal device |
| 08/31/1988 | CN87215123U Ac & dc dualpurpose full-automatic controller for electric bell |
| 07/06/1988 | CN87200914U Self-controlling bell clock |
| 06/28/1988 | US4754444 Alarm clock |
| 06/15/1988 | CN86209950U Mechanic pendulum clock with music timed alarm unit |
| 06/08/1988 | EP0269684A1 Alarm clock with an alarm signal device and an adjustable contact for actuating the latter. |
| 06/01/1988 | CN87214962U Photoelectric automatic-controlled musical chiming electronic quartz clock |
| 05/31/1988 | US4748602 Alarm mechanism |
| 05/11/1988 | CN87203887U Electronic alarm clock with timing controller and door bell |
| 05/10/1988 | US4744068 Timepiece setting arrangement including a safety lock |
| 04/26/1988 | US4740936 Alarm on-off mechanism for alarm watch |
| 04/05/1988 | CA1234906A1 Alarm device, especially for alarm clocks or timers |
| 03/23/1988 | CN87203933U Automatic time signal quartz clock |
| 03/16/1988 | CN87202801U Whole calendar quartz wall clock |
| 03/09/1988 | EP0258563A2 Alarm clock with a battery mounting support |
| 03/08/1988 | US4730284 Alarm clock |
| 02/24/1988 | CN87203925U Timing bell-ringing device |
| 02/23/1988 | US4727526 Alarm on-off mechanism for alarm watch |
| 02/03/1988 | CN87104980A Alarm mechanism |
| 01/27/1988 | CN87205843U Time alarm device of needle quartz clock controlled by ultrasonic wave |
| 12/30/1987 | WO1987007966A1 Alarm clock with an alarm signal device and an adjustable contact for actuating the latter |
| 12/30/1987 | CN87208433U Crystal clock giving the correct time by famous music with dual-sound track |
| 12/16/1987 | CN86210933U Improved controller for household clock |
| 12/02/1987 | EP0247438A1 Correcting device for a time piece with a safety lock |
| 11/04/1987 | CN87201717U Clock contact-box for automatically controlling bell |
| 09/30/1987 | CN86204148U Multi-purpose automatic chronopher |
| 09/15/1987 | US4693612 Alarm mechanism |
| 07/08/1987 | CN86108376A 闹机构 Downtown institution |
| 06/10/1987 | EP0225277A1 Electric contact device for clocks |
| 06/02/1987 | US4670864 Voice interruptible alarm device |
| 04/01/1987 | EP0216171A1 Multi alarm timepiece |
| 03/24/1987 | US4652140 Multi alarm timepiece |
| 12/16/1986 | US4629332 Timepiece with a quartz watch movement and an electrically controlled sound generator |
| 09/17/1986 | CN85102540A Day and night automatic controlled alarm clock |
| 08/13/1986 | CN85205075U Flash-music alarm clock with procedure timer |
| 05/27/1986 | US4591836 Battery operated panic alarm wrist watch |
| 05/20/1986 | US4589780 Means for generating an intermittent alarm sound for a timepiece |
| 03/11/1986 | US4575832 Device for timepiece electronically signalling a time by melody sounds and time striking sounds |
| 01/28/1986 | CA1199801A1 Countdown timer |
| 01/02/1986 | EP0166680A1 Time piece with a quartz movement and an electrically controlled sound generator |
| 08/28/1985 | EP0152823A2 Alarm device, in particular for an alarm clock or diary |
| 08/13/1985 | US4534661 Electric alarm wristwatch including cylindrical sound tube for transmitting sound |
| 07/02/1985 | US4526478 Electronic sound generating circuit for generation bell toll |
| 07/02/1985 | US4526477 Piezoelectric buzzer for wrist watches |
| 06/25/1985 | US4525076 Vocal announcing device for electronic timepiece |
| 06/18/1985 | US4523856 Electronic timepiece including an electro-acoustic transducer |
| 06/11/1985 | US4522506 Time signal clock |
| 03/19/1985 | US4505597 Novelty alarm clock |
| 03/19/1985 | US4505594 Multi-function analogue type watch |
| 01/15/1985 | US4493560 Acoustic alarm device for watches |
| 12/18/1984 | US4488820 Time signalling device for a timepiece which produces musical sounds |
| 11/13/1984 | US4482260 Electromechanical clock |
| 11/13/1984 | US4482257 Acoustic alarm device for watches |
| 10/02/1984 | US4474480 Hand type musical timepiece |
| 08/28/1984 | CA1173256A1 Electromechanical clock |
| 08/14/1984 | US4465381 Timepiece with modular alarm activating mechanism |
| 08/07/1984 | US4464062 Battery powered time piece |
| 07/24/1984 | US4461583 Alarm electronic timepiece having a stepping motor |
| 07/17/1984 | US4460280 Alarm setting device for timepieces |
| 07/10/1984 | US4459037 Wristwatch with piezoelectric buzzer |
| 07/03/1984 | US4457631 Attenuation-modulation circuit for generating electronic bell sounds for a timepiece |
| 06/27/1984 | EP0111671A1 Clock with an alarm and striking mechanism |
| 06/26/1984 | US4456387 Electronic alarm wrist watch |
| 05/29/1984 | CA1168053A1 Electromechanical trigger for alarm clocks and other timer-operated signal emitters |
| 04/24/1984 | US4445113 Small type acoustic device |
| 04/17/1984 | US4443113 Electromechanical trigger for alarm clocks and other timer-operated signal emitters |
| 04/03/1984 | US4440504 Electronic timepiece including a piezoelectric alarm |
| 03/06/1984 | US4435089 Power circuit for an electronic timepiece |
| 01/31/1984 | US4428683 Electrical connection construction for electronic timepiece |
| 01/24/1984 | US4427301 Timepiece with an activating mechanism |
| 01/03/1984 | US4423966 Alarm control system for alarm clock |
| 01/03/1984 | US4423964 Timepiece with alarm and time setting device |
| 12/27/1983 | US4422775 Device for controlling the functions of a watch and for displaying the state of at least one of the controlled functions |
| 11/01/1983 | US4412750 Timing mechanism with two separate programs operating separate switch actuators and having an alarm system |
| 08/02/1983 | US4396297 Device for stopping the striking of a clock at night |
| 07/27/1983 | EP0084193A1 Time piece with a short duration alarm |
| 06/21/1983 | US4389123 Electronic alarm watch |
| 03/30/1983 | EP0075535A1 Device for actuating the functions of a watch that can display the state of at least one of the actuated functions |
| 03/22/1983 | US4377345 Alarm signaling circuit for timepiece |
| 03/15/1983 | US4376994 Time detecting device for alarm clock |
| 03/15/1983 | US4376992 Electronic wristwatch with alarm function |
| 02/22/1983 | US4374624 Sound emitting device for electronic timepiece |
| 02/22/1983 | US4374622 Digital alarm timepiece with setting pointer |
| 02/01/1983 | US4371267 Time detecting device for alarm clock |
| 01/19/1983 | EP0069814A2 Battery powered timepiece |
| 01/04/1983 | US4367426 Oxides of lead, lanthanum, zirconium and titanium |