| Patents for G04C 21 - Producing acoustic time signals by electrical means (1,026) |
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| 06/30/1993 | CN1073779A Speech time inquiry chronopher |
| 04/28/1993 | CN2131126Y Computer language chronopher |
| 04/13/1993 | US5202859 Time informing clock |
| 01/05/1993 | US5177716 Alarm clock with an improved switch button assembly |
| 12/02/1992 | CN2123783U Clock controlled antomatic alarm device |
| 12/01/1992 | US5168476 Alarm clock |
| 11/25/1992 | CN2123088U Automatic-belling clock |
| 11/25/1992 | CN1066516A Time controlling device for mechanical sub-part |
| 11/19/1992 | EP0513633A2 Alarm clock |
| 10/28/1992 | CN2120353U Mechanical pointer type speech-sounds time signal machine movement pattern assembly |
| 10/27/1992 | US5159582 Electromechanical alarm clock |
| 10/07/1992 | CN2118320U Ball with electronic switch |
| 09/30/1992 | CN2117624U Multifunctional automatic bell controller for time schedule |
| 09/23/1992 | CN1064755A Melody alarm timepiece |
| 09/09/1992 | EP0502747A2 Melody alarm timepiece |
| 09/02/1992 | EP0501282A1 Selective pager receiver |
| 09/02/1992 | CN2114846U Language alarming device for needle pointer clock |
| 09/01/1992 | US5144600 Arrangement for and method of waking a sleeper |
| 08/19/1992 | CN2113508U Watch with timer and external acoustics device |
| 08/13/1992 | DE4103911A1 Alarm unit with alarm and switching-off unit - has electric sensor element for producing measurement value which differentiates according to pressure or absence of sleeper to switch-off alarm with absence |
| 08/12/1992 | CN2112853U Electric resistance needle pointer type clock language alarm device |
| 07/29/1992 | CN2111535U Machinary and electric changed device for clock language chronopher |
| 07/22/1992 | CN2110889U Photoelectric pronunciation time announcement apparatus for hand timepiece |
| 07/22/1992 | CN2110888U Alarm clock with store and playback functions |
| 07/15/1992 | CN2110243U Compilable quartz |
| 07/15/1992 | CN2110242U Meterage type clock speech sounds time inquiry device |
| 07/01/1992 | CN2108951U Digital clock/watch with language chronopher |
| 07/01/1992 | CN2108949U Multi-control clock |
| 06/24/1992 | CN2108322U Dual-timing quartz alarm clock |
| 06/23/1992 | US5124959 Hour chime clock |
| 05/20/1992 | CN2105089U Analog-type quartz clock with automatic alarming time at selected time |
| 05/20/1992 | CN2105088U Phonetic time alarmer of analog-type clock and watch |
| 04/29/1992 | CN2103157U Multipurpose machinery auto-control clock |
| 04/15/1992 | CN2101898U Chronopher with imitating cuckoo sound for quartz clock |
| 04/01/1992 | CN2100656U Paired alarming means of quartz alarm clock |
| 03/10/1992 | US5095468 Alarm clock |
| 03/04/1992 | CN2098058U Speech sounds chronopher |
| 01/08/1992 | CN2092773U Autocontrol electronic luminous watch (clock) |
| 12/25/1991 | CN2091470U Ultrasonic remote quartz with language chronopher |
| 12/18/1991 | CN2091001U Contactor for time signal of quartz clock |
| 12/04/1991 | CN1015026B Alarm mechanism |
| 11/27/1991 | CN2089640U Programmable music alarm quartz clock |
| 09/18/1991 | EP0446770A1 Alarm-clock |
| 09/17/1991 | US5050140 Alarm clock |
| 09/17/1991 | CA1288957C Alarm mechanism |
| 09/04/1991 | CN2084207U Timed auto-control electric bell clock |
| 09/04/1991 | CN2084206U 35 sign electronic music awakening clock |
| 07/31/1991 | CN2081989U Electronic clock with function of analogue in four tones of classical chinese phonetics |
| 07/17/1991 | EP0437033A2 Time keeping device with vibrational alarm |
| 07/10/1991 | CN2080683U Electro-mechanic squeaking device for quartz clock |
| 07/03/1991 | EP0434937A2 Bistable switching device for an alarm clock |
| 07/03/1991 | CN1013064B Alarm mechanism |
| 06/11/1991 | US5023853 Electric apparatus with silent alarm |
| 05/29/1991 | CN2078016U Additional alarm chronopher |
| 05/23/1991 | DE3153602C2 Dual function switch for snooze control alarm |
| 05/01/1991 | CN2076251U Multipurpose alarm clock with timing feeler lever |
| 04/24/1991 | EP0423586A2 Alarm clock |
| 04/24/1991 | EP0423576A2 Electromechanical schedule-clock |
| 04/24/1991 | EP0423277A1 Safety wrist-watch with a warning system |
| 03/26/1991 | US5003519 Alarm arrangement for a timepiece |
| 03/13/1991 | CN2073126U Magnetic-control time signal indicator of pointer-type timer clock |
| 03/12/1991 | US4999821 Truck driver's wake-up device |
| 02/27/1991 | CN2072241U Quartz clock with double alarm |
| 02/06/1991 | CN2070921U Alarm clock with automatic stopping alarm after knocking over |
| 01/30/1991 | CN2070497U Alarm clock composite switch |
| 01/09/1991 | CN2069128U Full automatic arrangement knocking bell according to giving indications |
| 12/26/1990 | CN2068063U Multi-functional clock-control alarm for vehicle |
| 12/19/1990 | CN2067845U Mechanical clock-controlled timer |
| 12/13/1990 | DE3918344A1 Electronic alarm clock with selectable sound - has programmable sound carrier e.g. transistor reproducing digitised original sounds and/or voices |
| 10/31/1990 | CN2064902U Multipoint preselection timing machinery clock |
| 10/26/1990 | WO1990013070A1 Safety wrist-watch with a warning system |
| 10/26/1990 | CA2031188A1 Safety wrist-watch with alarm |
| 10/23/1990 | US4965779 Multi-functional electronic timepiece |
| 10/10/1990 | CN1046055A Quartz clock being able alarm at any moment of 24 hrs |
| 10/03/1990 | CN2063245U Electronic lock with animal chronopher |
| 10/03/1990 | CN1045873A Chronopher activated by pointers contact for quartz clock |
| 09/26/1990 | CN2062868U Clock with "shengxiao" |
| 05/02/1990 | EP0366422A2 Electronic timepiece |
| 05/02/1990 | EP0269684B1 Alarm clock with an alarm signal device and an adjustable contact for actuating the latter |
| 05/01/1990 | US4922475 Alarm clock having means for bridging two circular conducting paths via an adjustable contact means thereby causing generation of an acoustic alarm system |
| 04/17/1990 | US4918674 Alarm timepiece |
| 02/28/1990 | CN2053763U Distance control time signal clock |
| 02/21/1990 | CN1039906A Electronic watch with alarm |
| 01/03/1990 | EP0349230A2 Alarm apparatus |
| 12/20/1989 | CN2049792U Quartz clock capable of timing and alarm once for every 24 hours |
| 12/20/1989 | CN1038177A Alarm arrangement for timepiece |
| 12/06/1989 | CN2048985U Punctual time apparatus with improved structure |
| 11/29/1989 | EP0343494A1 Alarm device for a time piece |
| 11/22/1989 | CN2048203U Automatic chronopher of distinguishable signal for work and rest |
| 11/22/1989 | CN2048202U Quartz electric alarm clock |
| 11/22/1989 | CN2048201U Control timing musical device |
| 11/15/1989 | CN2047803U Quartz clock with programmable timing and illumination |
| 11/08/1989 | CN2047402U Multifunctional timing clock |
| 11/08/1989 | CN2047401U Clock-controlled automatic chronopher |
| 11/08/1989 | CN2047400U Time alarm for point type clock |
| 11/02/1989 | EP0339316A2 Electronic alarm clock |
| 08/23/1989 | CN1035017A Display-sound converting method and its device |
| 08/02/1989 | CN2042212U Timer of point-type electronic quartz alarm clock |
| 08/02/1989 | CN2042210U Analog quartz alarm clock |
| 07/26/1989 | CN2041826U Quartz time signal clock without time ic |