G04C 21/20
By closing a contact to ring an electromechanical alarm
Official title: by closing a contact to ring an electromechanical alarm
G04C21/20 (By closing a contact to ring an electromechanical alarm) appears on 35 US grants and 1 published applications in this corpus.
Search patents in G04C- Granted patents
- 35
- Published applications
- 1
- Assignees
- 20
- Inventors
- 44
- Latest grant
- 2 Jul 2019
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Method for unlocking a function using a timepiece2 Jul 2019US 10,338,535 B2ETA SA Manufacture Horlogere Suisse
- Alarm system for desktop clock19 Feb 2002US 6,349,074 B1
- Alarm clock1 Dec 1992US 5,168,476 AJunghans Uhren GmbH
- Alarm arrangement for a timepiece26 Mar 1991US 5,003,519 AETA SA Fabriques d'Ebauches
- Alarm clock having means for bridging two circular conducting paths via an adjustable contact means thereby causing generation of an acoustic alarm system1 May 1990US 4,922,475 A
Most cited
By later US patents
- Alarm arrangement for a timepiece129US 5,003,519 AETA SA Fabriques d'Ebauches · 1991
- Alarm switch for an alarm circuit in a horological device79US 4,199,930 AThe Gillette Company · 1980
- Minute-interval alarming device for a clock or the like10US 3,996,734 ASeiko Koki Kabushiki Kaisha · 1976
- Alarm setting device for timepieces10US 4,069,658 ARhythm Watch Co., Ltd. · 1978
- Unlocking mechanism9US 4,000,384 ASeikosha Co., Ltd. · 1976