H03B 21/04
Using several similar stages
Official title: using several similar stages
H03B21/04 (Using several similar stages) appears on 18 US grants and 9 published applications in this corpus.
Search patents in H03B- Granted patents
- 18
- Published applications
- 9
- Assignees
- 18
- Inventors
- 38
- Latest grant
- 21 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 2 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 1 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 2 |
| 2025 | 2 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Stable scalable digital frequency reference21 Oct 2025US 12,451,893 B2National Research Council of Canada
- Stable scalable digital frequency reference17 Jun 2025US 12,334,940 B2National Research Council of Canada
- Apparatus and method for frequency multiplication26 Dec 2023US 11,855,650 B2Electronics and Telecommunications Research Institute
- Frequency synthesis and noise reduction23 Jun 2015US 9,065,458 B2BAE SYSTEMS plc
- Device and method for removing harmonic components9 Dec 2014US 8,907,713 B2Samsung Electronics Co., Ltd.
- Stable scalable digital frequency reference20 Jun 2024US 2024/0204787 A1National Research Council of Canada
- Stable scalable digital frequency reference23 May 2024US 2024/0171183 A1National Research Council of Canada
- Stable scalable digital frequency reference15 Dec 2022US 2022/0399896 A1National Research Council of Canada
- Apparatus and method for frequency multiplication25 Nov 2021US 2021/0367606 A1Electronics and Telecommunications Research Institute
- Device and method for removing harmonic components4 Jul 2013US 2013/0169342 A1Samsung Electronics Co., Ltd.
Most cited
By later US patents
- High spectral purity digital waveform synthesizer119US 5,495,202 AHughes Aircraft Company · 1996
- Frequency hopping synthesizer using dual gate amplifiers114US 5,661,424 AGTE Laboratories Incorporated · 1997
- Direct frequency synthesizer18US 4,791,377 AGTE Government Systems Corporation · 1988
- Direct frequency synthesizer using powers of two synthesis techniques12US 4,878,027 AHewlett-Packard Company · 1989
- Direct frequency synthesizer11US 5,166,629 AWestinghouse Electric Corp. · 1992