G04C 21/00
Producing acoustic time signals by electrical means
G04C21/00 (Producing acoustic time signals by electrical means) appears on 198 US grants and 74 published applications in this corpus.
Search patents in G04C- Granted patents
- 198
- Published applications
- 74
- Assignees
- 85
- Inventors
- 316
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 11 | 0 |
| 1978 | 7 | 0 |
| 1979 | 8 | 0 |
| 1980 | 15 | 0 |
| 1981 | 13 | 0 |
| 1982 | 5 | 0 |
| 1983 | 7 | 0 |
| 1984 | 11 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 5 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 5 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 2 |
| 2003 | 3 | 3 |
| 2004 | 0 | 0 |
| 2005 | 2 | 1 |
| 2006 | 2 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 2 | 2 |
| 2012 | 0 | 6 |
| 2013 | 1 | 1 |
| 2014 | 5 | 8 |
| 2015 | 4 | 2 |
| 2016 | 4 | 5 |
| 2017 | 8 | 5 |
| 2018 | 3 | 3 |
| 2019 | 5 | 5 |
| 2020 | 5 | 10 |
| 2021 | 2 | 5 |
| 2022 | 4 | 1 |
| 2023 | 4 | 3 |
| 2024 | 0 | 1 |
| 2025 | 2 | 1 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Medication assurance system and method14 Apr 2026US 12,603,167 B2Viavi Solutions Inc.
- Multifunction sleep training device with remote locking mechanism and methods of operation thereof31 Mar 2026US 12,589,217 B2Hatch Baby, Inc.
- Clock device with automatic simulation of sunrise or sunset24 Mar 2026US 12,585,227 B2Lutron Technology Company LLC
- Personal alarm apparatus, system, and method18 Nov 2025US 12,471,855 B2
- Musical or striking mechanism comprising an electric generator system4 Mar 2025US 12,242,229 B2The Swatch Group Research and Development Ltd
- Multifunction sleep training device with remote locking mechanism and methods of operation thereof9 Jul 2026US 2026/0192082 A1Hatch Baby, Inc.
- Clock Device with Automatic Simulation of Sunrise or Suset2 Jul 2026US 2026/0186448 A1Lutron Technology Company LLC
- Alert Wristband Device25 Jun 2026US 2026/0177990 A1
- Timer with a sound generator8 Jan 2026US 2026/0010121 A1
- Internal chime mechanism for an alarm clock28 Aug 2025US 2025/0271813 A1Nanu Design Inc.
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
- Smart watch and control method thereof78US 9,195,219 B2LG Electronics Inc. · 2015
- Alarm clock63US 5,568,452 A1996
- Slot machine alarm clock apparatus and method58US 6,657,923 B22003