H03F 3/00
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F3/00 (Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements) appears on 29,930 US grants and 26,748 published applications in this corpus.
Search patents in H03F- Granted patents
- 29,930
- Published applications
- 26,748
- Assignees
- 4,482
- Inventors
- 32,402
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 143 | 0 |
| 1977 | 166 | 0 |
| 1978 | 131 | 0 |
| 1979 | 85 | 0 |
| 1980 | 101 | 0 |
| 1981 | 136 | 0 |
| 1982 | 139 | 0 |
| 1983 | 119 | 0 |
| 1984 | 153 | 0 |
| 1985 | 204 | 0 |
| 1986 | 165 | 0 |
| 1987 | 144 | 0 |
| 1988 | 169 | 0 |
| 1989 | 163 | 0 |
| 1990 | 152 | 0 |
| 1991 | 183 | 0 |
| 1992 | 218 | 0 |
| 1993 | 169 | 0 |
| 1994 | 231 | 0 |
| 1995 | 257 | 0 |
| 1996 | 255 | 0 |
| 1997 | 241 | 0 |
| 1998 | 300 | 0 |
| 1999 | 353 | 0 |
| 2000 | 375 | 0 |
| 2001 | 433 | 120 |
| 2002 | 476 | 512 |
| 2003 | 568 | 537 |
| 2004 | 608 | 654 |
| 2005 | 532 | 854 |
| 2006 | 767 | 912 |
| 2007 | 798 | 972 |
| 2008 | 822 | 1031 |
| 2009 | 870 | 944 |
| 2010 | 984 | 916 |
| 2011 | 924 | 898 |
| 2012 | 921 | 948 |
| 2013 | 996 | 1008 |
| 2014 | 1053 | 1126 |
| 2015 | 1120 | 1183 |
| 2016 | 1272 | 1151 |
| 2017 | 1359 | 1178 |
| 2018 | 1224 | 1222 |
| 2019 | 1433 | 1425 |
| 2020 | 1466 | 1628 |
| 2021 | 1265 | 1410 |
| 2022 | 1247 | 1349 |
| 2023 | 1090 | 1334 |
| 2024 | 1054 | 1353 |
| 2025 | 1054 | 1146 |
| 2026 | 842 | 937 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H03F 3/20Power amplifiers12,250
- H03F 3/45Differential amplifiers11,349
- H03F 3/189High-frequency amplifiers9,536
- H03F 3/72Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means2,596
- H03F 3/30Single-ended push-pull [sepp] amplifiers2,194
- H03F 3/04Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements2,131
- H03F 3/60Amplifiers in which coupling networks have distributed constants2,052
- H03F 3/181Low-frequency amplifiers2,007
All 21 subgroupsShow fewer
- H03F 3/68Combinations of amplifiers1,780
- H03F 3/34Dc amplifiers in which all stages are dc-coupled1,134
- H03F 3/26Push-pull amplifiers663
- H03F 3/50Amplifiers in which input is applied to, or output is derived from572
- H03F 3/38Dc amplifiers with modulator at input and demodulator at output494
- H03F 3/005Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements487
- H03F 3/70Charge amplifiers185
- H03F 3/54Amplifiers using transit-time effect in tubes or semiconductor devices157
- H03F 3/42Amplifiers with two or more amplifying elements having their dc paths in94
- H03F 3/62Two-way amplifiers92
- H03F 3/02Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements27
- H03F 3/66Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another23
- H03F 3/46Reflex amplifiers4
Recent patents
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- Power amplifier6 Oct 2026US 12,756,362 B2Himax Technologies Limited
- Doherty amplifier system6 Oct 2026US 12,756,363 B2Qorvo US, Inc.
- Method and Apparatus for Computing Operations on a Non-volatile Memory Device8 Oct 2026US 2026/0311756 A1Singapore University of Technology and Design
- High-frequency power supply device8 Oct 2026US 2026/0312541 A1Kyosan Electric Mfg. Co., Ltd.
- Multistage amplifier8 Oct 2026US 2026/0312542 A1NTT, Inc.
- Doherty power amplifiers with controllable capacitor for tuning harmonic termination and inverter8 Oct 2026US 2026/0312543 A1Skyworks Solutions, Inc.
- Power protection loop for amplifier chain elements8 Oct 2026US 2026/0312544 A1Qorvo US, Inc.
Most cited
By later US patents
- Wireless medical diagnosis and monitoring equipment1,499US 5,957,854 A1999
- Electronic device having sound output module1,021US 7,046,082 B2Rohm Co., Ltd. · 2006
- Wireless medical diagnosis and monitoring equipment692US 5,862,803 A1999
- Wireless medical diagnosis and monitoring equipment582US 7,215,991 B2Motorola, Inc. · 2007
- Wireless medical diagnosis and monitoring equipment485US 6,289,238 B1Motorola, Inc. · 2001