H03B 21/00
Generation of oscillations by combining unmodulated signals of different frequencies
Official title: Generation of oscillations by combining unmodulated signals of different frequencies (H03B19/00 takes precedence; frequency changing circuits in general H03D)
H03B21/00 (Generation of oscillations by combining unmodulated signals of different frequencies) appears on 362 US grants and 230 published applications in this corpus.
Search patents in H03B- Granted patents
- 362
- Published applications
- 230
- Assignees
- 216
- Inventors
- 633
- Latest grant
- 2 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 6 | 0 |
| 1986 | 5 | 0 |
| 1987 | 10 | 0 |
| 1988 | 5 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 5 | 0 |
| 1993 | 7 | 0 |
| 1994 | 1 | 0 |
| 1995 | 7 | 0 |
| 1996 | 4 | 0 |
| 1997 | 6 | 0 |
| 1998 | 10 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 9 | 5 |
| 2002 | 10 | 13 |
| 2003 | 9 | 6 |
| 2004 | 14 | 13 |
| 2005 | 12 | 13 |
| 2006 | 11 | 11 |
| 2007 | 9 | 17 |
| 2008 | 6 | 16 |
| 2009 | 13 | 18 |
| 2010 | 25 | 10 |
| 2011 | 15 | 7 |
| 2012 | 9 | 7 |
| 2013 | 12 | 20 |
| 2014 | 21 | 17 |
| 2015 | 16 | 4 |
| 2016 | 9 | 5 |
| 2017 | 6 | 3 |
| 2018 | 5 | 8 |
| 2019 | 4 | 8 |
| 2020 | 16 | 10 |
| 2021 | 5 | 4 |
| 2022 | 5 | 4 |
| 2023 | 5 | 3 |
| 2024 | 2 | 5 |
| 2025 | 6 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Oscillator arrangement with improved phase-noise properties2 Dec 2025US 12,489,449 B2Telefonaktiebolaget LM Ericsson (publ)
- Stable scalable digital frequency reference21 Oct 2025US 12,451,893 B2National Research Council of Canada
- System for selectively adding noise pedestal to generated signal5 Aug 2025US 12,381,542 B2Keysight Technologies, Inc.
- Duffing oscillator reservoir computer8 Jul 2025US 12,353,845 B2Raytheon BBN Technologies Corp.
- Stable scalable digital frequency reference17 Jun 2025US 12,334,940 B2National Research Council of Canada
- Sine-wave generator including finite impulse response filter-based harmonic cancellation12 Feb 2026US 2026/0045935 A1NXP B. V.
- Oscillator array coupling through ferroelectric capacitors3 Jul 2025US 2025/0219581 A1Intel Corporation
- System for selectively adding noise pedestal to generated signal1 May 2025US 2025/0141437 A1Keysight Technologies, Inc.
- Oscillator arrangement with improved phase-noise properties5 Dec 2024US 2024/0405779 A1Telefonaktiebolaget LM Ericsson (publ)
- Stable scalable digital frequency reference20 Jun 2024US 2024/0204787 A1National Research Council of Canada
Most cited
By later US patents
- Adaptive radio transceiver with low noise amplification211US 6,417,737 B1Broadcom Corporation · 2002
- Direct conversion FM receiver with offset196US 4,944,025 AAT&E Corporation · 1990
- Variable frequency synthesizer with reduced phase noise134US 4,602,220 AAdvantest Corporation · 1986
- High spectral purity digital waveform synthesizer119US 5,495,202 AHughes Aircraft Company · 1996
- Frequency signal generator apparatus and method for simulating interference in mobile communication systems118US 5,220,680 APacTel Corporation · 1993