H03F 3/21
With semiconductor devices only
Official title: with semiconductor devices only {(H03F3/245 takes precedence)}
H03F3/21 (With semiconductor devices only) appears on 7,563 US grants and 7,712 published applications in this corpus.
Search patents in H03F- Granted patents
- 7,563
- Published applications
- 7,712
- Assignees
- 1,651
- Inventors
- 9,360
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 19 | 0 |
| 1978 | 14 | 0 |
| 1979 | 10 | 0 |
| 1980 | 9 | 0 |
| 1981 | 6 | 0 |
| 1982 | 11 | 0 |
| 1983 | 9 | 0 |
| 1984 | 16 | 0 |
| 1985 | 16 | 0 |
| 1986 | 10 | 0 |
| 1987 | 17 | 0 |
| 1988 | 13 | 0 |
| 1989 | 8 | 0 |
| 1990 | 16 | 0 |
| 1991 | 18 | 0 |
| 1992 | 18 | 0 |
| 1993 | 21 | 0 |
| 1994 | 11 | 0 |
| 1995 | 30 | 0 |
| 1996 | 17 | 0 |
| 1997 | 24 | 0 |
| 1998 | 29 | 0 |
| 1999 | 37 | 0 |
| 2000 | 52 | 0 |
| 2001 | 62 | 24 |
| 2002 | 73 | 75 |
| 2003 | 75 | 76 |
| 2004 | 111 | 127 |
| 2005 | 91 | 194 |
| 2006 | 165 | 194 |
| 2007 | 172 | 246 |
| 2008 | 174 | 234 |
| 2009 | 174 | 210 |
| 2010 | 229 | 218 |
| 2011 | 235 | 232 |
| 2012 | 243 | 231 |
| 2013 | 238 | 286 |
| 2014 | 284 | 372 |
| 2015 | 375 | 431 |
| 2016 | 418 | 456 |
| 2017 | 512 | 470 |
| 2018 | 513 | 501 |
| 2019 | 523 | 507 |
| 2020 | 514 | 561 |
| 2021 | 438 | 439 |
| 2022 | 371 | 379 |
| 2023 | 307 | 387 |
| 2024 | 303 | 364 |
| 2025 | 306 | 280 |
| 2026 | 214 | 218 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Power amplifier6 Oct 2026US 12,756,362 B2Himax Technologies Limited
- Doherty amplifier system6 Oct 2026US 12,756,363 B2Qorvo US, Inc.
- Headset device with speakers, signal processing method and analysis system thereof29 Sep 2026US 12,749,473 B2Luxshare Precision Technology (Nanjing) Co., Ltd
- Group III nitride Doherty amplifier using different epitaxial structures29 Sep 2026US 12,750,010 B2MACOM Technology Solutions Holdings, Inc.
- Class-D audio amplifier29 Sep 2026US 12,750,017 B2Elite Semiconductor Microelectronics Technology Inc.
- High-frequency power supply device8 Oct 2026US 2026/0312541 A1Kyosan Electric Mfg. Co., Ltd.
- Power protection loop for amplifier chain elements8 Oct 2026US 2026/0312544 A1Qorvo US, Inc.
- Load impedance circuit for amplifier8 Oct 2026US 2026/0312545 A1STMicroelectronics International N. V.
- Power amplifier systems with load control8 Oct 2026US 2026/0312548 A1Skyworks Solutions, Inc.
- Cascode amplifier circuit1 Oct 2026US 2026/0303022 A1Murata Manufacturing Co., Ltd.
Most cited
By later US patents
- Electronic device having sound output module1,021US 7,046,082 B2Rohm Co., Ltd. · 2006
- Efficient parallel-stage power amplifier252US 5,872,481 AQUALCOMM Incorporated · 1999
- Power waveform synthesis using bilateral devices243US 5,930,128 AEricsson Inc. · 1999
- Multi-stage high efficiency linear power amplifier and method therefor219US 5,786,727 AMotorola, Inc. · 1998
- High-frequency amplifier, transmitting device and receiving device216US 5,903,854 ASony Corporation · 1999