| Patents for G04C 21 - Producing acoustic time signals by electrical means (1,026) |
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| 07/17/2003 | US20030133363 Clock with pressure sensitive signal source |
| 06/26/2003 | WO2003052527A1 Radio clockwork mechanism having a detector for setting the clock hands |
| 06/26/2003 | US20030117272 System and method of silent alarm |
| 05/28/2003 | CN2553405Y Multifunction alarm clock |
| 05/13/2003 | US6560802 Pillow with alarm |
| 04/17/2003 | DE20302510U1 Multifunction watch has programmable vibration alarm fits different straps |
| 04/02/2003 | CN2543107Y Programmable alarm-setting quartz clock |
| 03/25/2003 | US6536942 Alarm electronic timepiece |
| 02/26/2003 | CN1399175A Large electromechanical pointer clock |
| 02/20/2003 | US20030035346 Slot machine alarm clock apparatus and method |
| 02/12/2003 | CN2535833Y Alarming clock movement structure |
| 02/05/2003 | CN2534612Y Time signal clock |
| 01/29/2003 | CN2533497Y Alarm timing structure |
| 01/23/2003 | US20030016589 Clock movement with a display for world time zones |
| 01/14/2003 | US6507538 Alarm clock with wing-shaped snooze control |
| 11/06/2002 | CN1378108A Clock and alarm clock corrected by radio wave with ringing function |
| 10/10/2002 | US20020144351 Pillow |
| 10/03/2002 | US20020141291 Alarm clock with wing-shaped snooze control |
| 09/11/2002 | CN2510894Y Timer timing-sound amplifying device |
| 09/04/2002 | CN1090349C Electronic watch with minute repeater function |
| 09/04/2002 | CN1090348C Toner cartridge for developing device including in image forming apparatus |
| 07/10/2002 | CN2499871Y Alarm bell machine core |
| 06/26/2002 | CN2497349Y New-type alarm clock |
| 06/19/2002 | CN2496058Y Improvement of timpiece movement |
| 05/29/2002 | CN2493957Y Multi-function timing luminous clock |
| 05/22/2002 | CN1350214A Clock movement with time zone display |
| 05/01/2002 | CN1084001C Control circuit for piezoelectric vibrator and watch using said circuit |
| 03/13/2002 | CN2482117Y Full-automatic timer |
| 03/06/2002 | CN2480881Y Clock capable of sensing electromagnetic wave |
| 02/27/2002 | CN1337607A Method and system of self renewing appointment display of intelligent watch |
| 02/19/2002 | US6349074 Alarm system for desktop clock |
| 01/23/2002 | EP1174777A2 Pointer electronic timepiece, operating method and control program thereof |
| 01/17/2002 | US20020006080 Pointer electronic timepiece, operating method and control program thereof |
| 01/09/2002 | CN2470863Y Alarming on-off device of alarm clock |
| 12/19/2001 | CN2466688Y Signalling device of movement for sound signal machine |
| 12/19/2001 | CN2466687Y Mechanical programmable speech time signal clock |
| 12/12/2001 | CN2465215Y Alarm setting mechanism for quartz clock |
| 12/05/2001 | CN2463862Y Quartz clock movement with mechanical calendar and alarm mechanism |
| 12/04/2001 | US6325534 Medication reminder |
| 11/28/2001 | CN2462434Y Mono-contact type automatic alarming quartz clock movement |
| 11/27/2001 | US6321868 Watertight apparatus capable of being immersed and including an acoustic transducer |
| 10/17/2001 | CN2454795Y 'Double alarm clock' for students |
| 08/23/2001 | WO2001061424A1 Alarm system for desktop clock |
| 08/15/2001 | CN2443403Y Timing alarm mechanism for quartz clock |
| 08/15/2001 | CN2443402Y Clock movement with time zone display |
| 08/08/2001 | CN2442295Y Time telling mechanism for clock |
| 07/18/2001 | CN2439681Y Quantz clock movement with inner acoustic means |
| 07/11/2001 | CN2439050Y Musical time control device |
| 07/04/2001 | CN2438150Y 24 hour indicator type movement of quartz clock |
| 06/20/2001 | CN2435767Y Analog-type alarm clock capable of telling what day of the week |
| 04/17/2001 | US6219304 Device capable of being submerged and including an acoustic transducer |
| 04/11/2001 | CN1291064A Water-proof device with sound energy convertor capable of immersing |
| 02/06/2001 | US6185159 Radio control alarm device |
| 01/17/2001 | EP1069485A2 Alarm clock, in particular radio alarm with digital display |
| 12/20/2000 | CN2411500Y Movement of quartz alarm clock with plument |
| 12/13/2000 | EP1059575A2 Alarm clock and alarm clock simulating indicator |
| 12/13/2000 | CN2410663Y Clocks and watches |
| 11/15/2000 | CN1273379A Belling device of clock |
| 10/17/2000 | US6134190 Alarm setting mechanism for an electronic timepiece having an alarm status pattern on the front of the timepiece dial |
| 07/19/2000 | CN2388626Y Timing reminding medicine case |
| 07/12/2000 | CN2386802Y Electronic indication health box |
| 06/14/2000 | CN2383091Y Waking device for alarm clock |
| 05/24/2000 | CN2379822Y Novel clock |
| 04/05/2000 | CN2372708Y Electronic adjusting contactless quartz pointer alarm clock |
| 03/23/2000 | DE19843332A1 Alarm clock for sliding an off-switch and showing alarm calls in a window includes an off-switch fitted on the case side not visible on the clock face and switch positions visible through a window in the clock face. |
| 02/23/2000 | CN1049746C Timepiece comprising electro-acoustic transducer |
| 02/16/2000 | CN2364486Y Clock with electro-acoustic time announcement |
| 12/28/1999 | US6008720 Portable timer alarm device with ear attachment |
| 12/02/1999 | DE19824274A1 Alarm clock with radio and analogue display |
| 11/17/1999 | CN2349601Y Multi-sound electric clock |
| 10/12/1999 | US5966346 Alarm clock |
| 10/06/1999 | CN1045493C 闹钟 Alarm Clock |
| 09/09/1999 | DE19808469A1 Radio controlled analogue alarm clock |
| 08/17/1999 | US5940348 Electronic timepiece |
| 05/26/1999 | CN1043489C Vibration promptor |
| 04/28/1999 | CN1214965A Device capable immersing and containing sound transducer |
| 02/02/1999 | CA2061532C Selective pager receiver |
| 09/23/1998 | CN2292300Y Daily schedule alarm device by timing playing music |
| 09/09/1998 | CN2290875Y Alarm control device of alarm clock |
| 08/26/1998 | EP0860757A1 Electronic timepiece |
| 08/25/1998 | US5798986 Alarm mechanism system |
| 07/15/1998 | CN1187644A Alarm clock |
| 05/26/1998 | US5757732 Alarm clock having on-off switch timer |
| 05/13/1998 | EP0678795B1 Alarm clock |
| 04/15/1998 | EP0836126A2 Alarm electronic timepiece |
| 04/15/1998 | EP0836125A2 Alarm electronic timepiece |
| 04/02/1998 | WO1998013734A1 Time equipment |
| 04/01/1998 | CN2277534Y Computer time and alarm device |
| 03/18/1998 | CN1037807C Electroacoustic transducer |
| 03/10/1998 | US5726626 Waterproof acoustic alarm safety device embodied in a wristwatch |
| 03/05/1998 | WO1998009202A1 Electronic timepiece |
| 02/25/1998 | CN2275256Y Buzzer timer |
| 01/13/1998 | US5708629 Structure of alarm clock |
| 11/19/1997 | CN2268269Y Speech-sound random-access device for watch |
| 10/29/1997 | CN2266143Y Hypnogenetic clock capable of optionally timing |
| 10/29/1997 | CN2266142Y Electronic watch with recording and playback functions |
| 09/30/1997 | US5673238 Electronic watch with minute-repeater function |
| 09/16/1997 | US5668783 For use in an alarm |
| 09/10/1997 | CN2262252Y Electric clock |
| 08/27/1997 | CN2261034Y Auxiliary lighting device for photo-acoustical combined-contral speech-voice time teller |