G04R 20/08
The radio signal being broadcast from a long-wave call sign
Official title: the radio signal being broadcast from a long-wave call sign, e.g. DCF77, JJY40, JJY60, MSF60 or WWVB
G04R20/08 (The radio signal being broadcast from a long-wave call sign) appears on 195 US grants and 218 published applications in this corpus.
Search patents in G04R- Granted patents
- 195
- Published applications
- 218
- Assignees
- 55
- Inventors
- 233
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 6 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 4 | 1 |
| 2002 | 2 | 1 |
| 2003 | 2 | 8 |
| 2004 | 0 | 6 |
| 2005 | 2 | 27 |
| 2006 | 7 | 14 |
| 2007 | 5 | 12 |
| 2008 | 15 | 15 |
| 2009 | 12 | 11 |
| 2010 | 11 | 9 |
| 2011 | 8 | 24 |
| 2012 | 18 | 26 |
| 2013 | 19 | 17 |
| 2014 | 12 | 13 |
| 2015 | 13 | 4 |
| 2016 | 10 | 7 |
| 2017 | 3 | 5 |
| 2018 | 6 | 6 |
| 2019 | 3 | 3 |
| 2020 | 3 | 2 |
| 2021 | 2 | 2 |
| 2022 | 3 | 3 |
| 2023 | 2 | 0 |
| 2024 | 1 | 2 |
| 2025 | 1 | 0 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electronic timepiece, wireless device, wireless communication system, time correction method, and non-transitory recording medium16 Jun 2026US 12,656,743 B2Casio Computer Co., Ltd.
- Radio-controlled timepiece and method of controlling radio-controlled timepiece17 Feb 2026US 12,554,231 B2Seiko Epson Corporation
- Electronic watch and control method for electronic watch21 Jan 2025US 12,204,290 B2Seiko Epson Corporation
- Electronic timepiece10 Dec 2024US 12,164,269 B2Seiko Epson Corporation
- Electronic timepiece7 Mar 2023US 11,599,068 B2Seiko Epson Corporation
- Analog electronic timepiece5 Dec 2024US 2024/0402652 A1
- Radio-Controlled Timepiece And Method Of Controlling Radio-Controlled Timepiece21 Mar 2024US 2024/0094682 A1Seiko Epson Corporation
- Electronic Watch6 Oct 2022US 2022/0317629 A1Seiko Epson Corporation
- Electronic Timepiece25 Aug 2022US 2022/0269224 A1Seiko Epson Corporation
- Electronic Watch And Control Method For Electronic Watch11 Aug 2022US 2022/0253018 A1Seiko Epson Corporation
Most cited
By later US patents
- Navigation wristwear198US 5,627,548 ATrimble Navigation Limited · 1997
- Navigation wristwear84US 5,781,155 ATrimble Navigation Limited · 1998
- Synchronization method and apparatus for isolated clock system51US 5,999,493 ASurVivaLink Corporation · 1999
- High precision radio signal controlled continuously updated digital clock47US 4,768,178 APrecision Standard Time, Inc. · 1988
- Disciplined oscillator system with frequency control and accumulated time control45US 4,525,685 ASpectracom Corporation · 1985