G04C 21/28
By closing a contact to put into action electro-acoustic means
Official title: by closing a contact to put into action electro-acoustic means, e.g. awakening by music
G04C21/28 (By closing a contact to put into action electro-acoustic means) appears on 7 US grants and 2 published applications in this corpus.
Search patents in G04C- Granted patents
- 7
- Published applications
- 2
- Assignees
- 5
- Inventors
- 13
- Latest grant
- 9 Feb 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 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 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Quartz clock type timer movement9 Feb 2021US 10,915,068 B2Hangzhou Jingcheng Sanhe Timer Industry Co., Ltd.
- Method and system for managing an alarm signal, alarm clock comprising such a system2 Jun 2015US 9,046,877 B2Woox Innovations Belgium NV
- Alarm clock having on-off switch timer26 May 1998US 5,757,732 A
- Truck driver's wake-up device12 Mar 1991US 4,999,821 A
- Alarm switch for an alarm circuit in a horological device29 Apr 1980US 4,199,930 AThe Gillette Company
Most cited
By later US patents
- Alarm switch for an alarm circuit in a horological device79US 4,199,930 AThe Gillette Company · 1980
- Switching circuit for power supply to electronic apparatus13US 3,949,240 ASony Corporation · 1976
- Alarm clock having on-off switch timer5US 5,757,732 A1998
- Truck driver's wake-up device2US 4,999,821 A1991