| Patents for G04C 21 - Producing acoustic time signals by electrical means (1,026) |
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| 06/04/1997 | CN2255623Y Wide-domain music correct-time-giving electronic timer |
| 06/03/1997 | US5635788 Control circuit for a piezoelectric vibrator |
| 05/28/1997 | DE19543586A1 Radio alarm with analog time display and quartz control circuit |
| 05/21/1997 | CN2254561Y Sound answering time signal clock |
| 05/20/1997 | US5632026 System and method for managing the routine execution in a computer system |
| 05/14/1997 | CN2254201Y Adjustable contact mechanism for timer sound |
| 04/08/1997 | US5619478 Analog timepiece having means for signaling an alarm time and a change of mode |
| 04/02/1997 | CN2251155Y Auto-controlled electric winding up spring time signal clock |
| 03/26/1997 | EP0764895A1 Sound generator, in particular for time piece |
| 03/22/1997 | CA2186069A1 Sound generator in particular for a timepiece |
| 03/19/1997 | CN2249915Y Programmable alarm quartz clock and its core |
| 02/26/1997 | CN1143762A Timing alarm apparatus |
| 02/18/1997 | US5604718 Timepiece Comprising an electro-acoustic transducer |
| 02/12/1997 | EP0758107A1 Timer alarm device |
| 02/11/1997 | US5602802 Medication reminder system and apparatus |
| 02/05/1997 | CN2246816Y Recording and timing clock |
| 01/22/1997 | CN2245775Y Timing alarm quartz with self-programming |
| 01/15/1997 | CN1140288A Acoustic alarm safety device |
| 01/08/1997 | CN2244737Y Alarm clock apparatus for preventing lazying on bed |
| 12/18/1996 | CN2243090Y Singing timer |
| 11/06/1996 | EP0741344A1 Security device with acoustic alarm |
| 10/30/1996 | CN2239047Y Alarm clock |
| 10/29/1996 | US5570327 Ting actuating device for clock mechanism |
| 10/22/1996 | US5568452 Alarm clock |
| 10/01/1996 | US5561413 Sound generator |
| 09/18/1996 | CN2235634Y Self-recording type time piece with phonetic reporting |
| 09/11/1996 | CN2235134Y Multifunctional alarm clock sound controller |
| 08/28/1996 | CN1129821A Control circuit for a piezoelectric vibrator |
| 08/28/1996 | CN1129820A Timepiece comprising an electro-acoustic transducer |
| 08/21/1996 | CN2233597Y Multiple timing alarm quartz clock |
| 08/21/1996 | CN1032612C Speech-asking type chronopher |
| 08/08/1996 | DE4445646C1 Electric alarm clock with switching slider movable in vertical plane |
| 07/24/1996 | CN2231803Y Non-hand lighting quartz clock |
| 06/04/1996 | US5524101 Motion controlled clock with alarm and flashlight features |
| 05/15/1996 | EP0712059A1 Command circuit for piezo-electric vibrator |
| 04/16/1996 | US5508688 Selective pager receiver |
| 03/10/1996 | CA2131783A1 Medication reminder system and apparatus |
| 02/14/1996 | CN1116737A Toner cartridge for a developing device including in an image forming apparatus |
| 02/07/1996 | CN1116328A Electronic watch with minute repeater function |
| 02/07/1996 | CN1116327A 闹钟 Alarm Clock |
| 02/07/1996 | CN1030942C Melody alarm timepiece |
| 01/31/1996 | EP0694824A1 Timepiece with electro acoustic transducer |
| 01/31/1996 | EP0694823A2 Analog electronic timepiece |
| 12/27/1995 | CN2216263Y Acoustic time signal producing device for quartz clock |
| 12/26/1995 | US5479379 Alarm clock |
| 11/22/1995 | EP0683441A1 Electronic watch with minute repetition function |
| 11/15/1995 | CN2212797Y Improved alarm clock with lift cover |
| 10/25/1995 | EP0678795A1 Alarm clock |
| 09/19/1995 | US5452270 Melody alarm timepiece |
| 09/06/1995 | CN2206972Y Contacting device for quartz alarm |
| 08/30/1995 | CN2206468Y Improved acoustic time signal mechanism for quartz alarm clock movement |
| 08/16/1995 | CN2205568Y Electromagnet coil for alarm clock with improvement of combining structure |
| 07/05/1995 | CN1104779A Silent electromagnetic alarm |
| 06/13/1995 | US5425006 Alarm clock |
| 06/07/1995 | CN2200194Y Watch or clock with striking mechanism |
| 05/18/1995 | WO1995013570A1 Alarm clock |
| 05/16/1995 | US5416751 Electroacoustic transducer |
| 04/19/1995 | CN2195108Y Crossbar programmed timing controller |
| 02/15/1995 | CN2189757Y Automatic bell controllor for school |
| 02/15/1995 | CN2189756Y Wireless telecontrol language timing device |
| 01/18/1995 | CN2187807Y Pointer type speech reporting quartz wristwatch |
| 11/30/1994 | CN2184217Y Automatic time-reporting quartz clock |
| 11/23/1994 | EP0625738A1 Silent electromagnetic alarm |
| 11/23/1994 | EP0625736A1 Chronographic watch with two push buttons and without any crown-stem |
| 11/16/1994 | CN2183004Y Quartz clock with self-control ringing bell |
| 11/15/1994 | US5365497 Silent electromagnetic alarm |
| 11/08/1994 | US5363349 Clock assembly having a rotating device |
| 09/14/1994 | CN1092238A Electroacoustic transducer |
| 08/16/1994 | US5339296 Electric alarm clock with battery back-up |
| 08/09/1994 | US5337291 Easy setting hour repeating device |
| 08/03/1994 | CN2173421Y Open-lid type alarm clock |
| 07/13/1994 | CN1025459C Electronic watch with alarm |
| 06/15/1994 | CN2169153Y Alarm clock with schedule |
| 05/25/1994 | EP0598556A1 Electroacoustic transducer |
| 05/18/1994 | CN2165469Y Automatic awakening timepiece |
| 05/18/1994 | CN2165468Y Alarm bell control structure for quartz alarm clock |
| 04/27/1994 | CN2163397Y Alarm clock timing mechanism |
| 04/19/1994 | US5305291 Alarm setting and actuating mechanism for analog timepiece |
| 04/13/1994 | CN2161942Y Setting device for bell of alarm clock |
| 04/06/1994 | CN2160932Y Alarm time-piece with twelve animals |
| 03/23/1994 | CN2159582Y Electronic programable timer |
| 03/08/1994 | US5293356 Vocal reporting device for pointer type timers with photoelectric calibration device |
| 02/23/1994 | CN2157534Y Animal sound imitation clock |
| 01/26/1994 | CN2154502Y Time striking clock for islam |
| 01/26/1994 | CN2154501Y Movement structure of alarm clock with time |
| 01/19/1994 | CN2153825Y Full plastic quartz alarm clock movement |
| 01/12/1994 | CN2153077Y Structure of alarm clock movement |
| 01/05/1994 | CN2152229Y Automatic clock ringing device |
| 01/05/1994 | CN2152228Y Voice-operated time announcement clock |
| 11/24/1993 | CN2147566Y Multi-programming time controller |
| 11/24/1993 | CN2147565Y Self-programming programme control timing clock |
| 10/12/1993 | US5253230 Alarm clock with a switch button asembly |
| 10/06/1993 | EP0564407A1 Pocket- or wristwatch |
| 08/24/1993 | US5239523 Vocal reporting device for pointer type timers with accumulative timing transformation |
| 08/18/1993 | EP0555506A1 Vocal reporting device for pointer type timers with photoelectric calibration device |
| 08/18/1993 | EP0555505A1 Vocal reporting device for pointer type timers with accumulative timing transformation |
| 07/21/1993 | CN2138806Y Computer program controller with synchronous pointer and digital display |
| 07/20/1993 | US5229982 Switch assembly of an alarm clock with a snooze feature mounted thereto |
| 07/06/1993 | US5226021 Train simulation alarm clock apparatus |
| 06/30/1993 | CN2137371Y Automatically controlled clock with electric bell |