| Patents for G04G 13 - Producing acoustic time signals (1,738) |
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| 09/06/1988 | US4769836 Dialing tone generator employing low frequency oscillator |
| 04/26/1988 | US4740936 Alarm on-off mechanism for alarm watch |
| 04/05/1988 | CA1234906A1 Alarm device, especially for alarm clocks or timers |
| 03/03/1988 | DE3619156A1 Organisation timer (OT) |
| 01/05/1988 | US4717261 Recording/reproducing apparatus including synthesized voice converter |
| 12/30/1987 | CN87208433U Crystal clock giving the correct time by famous music with dual-sound track |
| 12/22/1987 | US4715010 Schedule alarm device |
| 12/15/1987 | US4712926 Electronic timepiece |
| 11/17/1987 | US4707794 Playback operation circuit in synthetic-speech calculator |
| 11/11/1987 | CN86200364U Clock with chronopher |
| 11/10/1987 | US4706288 Speech synthesizer output device |
| 10/21/1987 | CN87200675U Time signal unit for electronic clock with special time signal mode |
| 10/20/1987 | US4701862 Audio output device with speech synthesis technique |
| 10/13/1987 | US4699518 Musical scale generating circuit |
| 10/06/1987 | US4697932 Multi-signal alarm |
| 07/30/1987 | DE3603524C1 Control arrangement with control unit and actuator |
| 07/21/1987 | US4681465 Alarm signalling electronic timepiece with timer function |
| 06/25/1987 | DE3545088A1 Alarm device |
| 06/02/1987 | US4670864 Voice interruptible alarm device |
| 04/21/1987 | US4659231 Islamic prayer calculator/clock device |
| 04/01/1987 | EP0216171A1 Multi alarm timepiece |
| 03/24/1987 | US4652140 Multi alarm timepiece |
| 02/19/1987 | DE3529561A1 Arrangement for replaying a selected audio information from an audio information block of an audio medium |
| 12/10/1986 | EP0204241A2 Electronic timepiece including a schedule memory device |
| 09/03/1986 | CN85203830U Automatic electric bell |
| 07/23/1986 | EP0188283A2 Recording/reproducing apparatus including synthesized voice converter |
| 05/20/1986 | US4589780 Means for generating an intermittent alarm sound for a timepiece |
| 05/20/1986 | US4589779 Multi-alarm timepiece with simplified operating means |
| 03/18/1986 | US4576484 Memory enhancing apparatus |
| 03/11/1986 | US4575832 Device for timepiece electronically signalling a time by melody sounds and time striking sounds |
| 02/26/1986 | EP0172260A1 Countdown timer |
| 02/25/1986 | US4573134 Talking clock calculator |
| 01/14/1986 | US4564954 Noise reduction circuit of synthetic speech generating apparatus |
| 12/27/1985 | EP0165604A2 Recording/reproducing apparatus including a digital memory device |
| 11/05/1985 | US4551029 Electronic timepiece with a sound generator |
| 10/29/1985 | CA1196061A1 Sleep switch volume control |
| 10/22/1985 | US4548511 Electronic timepiece with voice memory |
| 10/08/1985 | US4545686 Electronic timepiece |
| 10/01/1985 | US4544283 Alarm timepiece with facilities of providing precausionary alarm |
| 09/03/1985 | US4538924 Clock device |
| 08/28/1985 | EP0152823A2 Alarm device, in particular for an alarm clock or diary |
| 08/20/1985 | US4536093 Electronic timepiece with system for synchronizing hands |
| 08/13/1985 | US4534661 Electric alarm wristwatch including cylindrical sound tube for transmitting sound |
| 07/30/1985 | US4531841 Electronic audio-visual timepiece |
| 07/23/1985 | US4530607 Alarm and reset circuit for a countdown timer |
| 07/02/1985 | US4526478 Electronic sound generating circuit for generation bell toll |
| 07/02/1985 | US4526477 Piezoelectric buzzer for wrist watches |
| 07/02/1985 | US4526476 Correction system for hands display type of electronic timepiece |
| 06/25/1985 | US4525076 Vocal announcing device for electronic timepiece |
| 06/18/1985 | US4523858 Combined electronic calculator and electronic alarm timepiece |
| 06/18/1985 | US4523856 Electronic timepiece including an electro-acoustic transducer |
| 04/02/1985 | US4508457 Electronic timepiece with record/playback circuits |
| 03/19/1985 | US4505594 Multi-function analogue type watch |
| 02/19/1985 | US4500211 Audibly announcing apparatus with power saving feature |
| 02/12/1985 | US4498787 Reminder |
| 01/29/1985 | US4496247 Display device with transparent cover as a vibrator of a sound generator |
| 01/15/1985 | US4493560 Acoustic alarm device for watches |
| 01/15/1985 | US4493559 Analogue alarm electronic timepiece |
| 12/27/1984 | CA1179850A Interpolating time setting apparatus |
| 12/25/1984 | US4490711 Electronic programmable multiple alarm timing device and record |
| 12/18/1984 | US4488820 Time signalling device for a timepiece which produces musical sounds |
| 12/11/1984 | US4487512 Programmable alarm clock apparatus |
| 11/13/1984 | US4482257 Acoustic alarm device for watches |
| 11/13/1984 | US4481852 Sound generating circuit for timepiece |
| 11/06/1984 | US4481674 Sleep switch volume control |
| 10/23/1984 | US4478525 Musical envelope control device |
| 10/23/1984 | US4478523 Speech synthesizer timepiece with minimal number of keys for time announcements |
| 10/16/1984 | US4476765 Electronic music signal generator |
| 09/18/1984 | US4472069 Minature electronic apparatus having alarm sound generating function |
| 09/18/1984 | US4472065 Time read-out device for electronic clocks |
| 09/11/1984 | US4470706 Analog type of electronic timepiece |
| 08/21/1984 | US4466743 Electronic audio-visual timepiece |
| 08/07/1984 | US4464059 Speech synthesizer timepiece with advance announcement |
| 08/01/1984 | EP0029050B1 Digital display clock |
| 07/31/1984 | US4462696 Electronic watches |
| 07/24/1984 | US4461583 Alarm electronic timepiece having a stepping motor |
| 07/17/1984 | US4460928 Electronic apparatus for voice output of stored information |
| 07/10/1984 | US4459037 Wristwatch with piezoelectric buzzer |
| 07/10/1984 | US4459031 Electronic timepiece |
| 07/03/1984 | US4457631 Attenuation-modulation circuit for generating electronic bell sounds for a timepiece |
| 06/26/1984 | US4456385 Interpolating time set apparatus |
| 06/05/1984 | US4452119 Electronic musical instrument with musical information input means |
| 05/29/1984 | US4451158 Countdown timer |
| 05/29/1984 | US4450743 Electronic musical instrument with musical information input means |
| 05/22/1984 | US4449829 Speech synthesizer timepiece |
| 05/15/1984 | US4449232 Audibly announcing apparatus |
| 05/15/1984 | US4448542 Electronic timepiece |
| 04/24/1984 | US4444515 Earring watch |
| 04/17/1984 | US4443114 Electronic timepiece with melody alarm faculties |
| 04/03/1984 | US4440504 Electronic timepiece including a piezoelectric alarm |
| 03/20/1984 | US4437380 Musical envelope-producing device |
| 03/20/1984 | CA1163812A1 Speech synthesizer timepiece with alarm function |
| 03/06/1984 | US4435089 Power circuit for an electronic timepiece |
| 02/28/1984 | US4433918 Analog display electronic timepiece with multi-mode display capability |
| 02/21/1984 | US4432653 Wrist watch |
| 02/14/1984 | US4431312 Radio alarm converter |
| 02/07/1984 | US4430006 Random multiple push button clock alarm deactivation system |
| 02/07/1984 | US4430005 Speech synthesizer timepiece with alarm function |
| 01/24/1984 | US4427299 Electronic device with an alarm function |
| 01/17/1984 | US4426736 Programmable clock radio having nap and sleep type features |