H03F 3/4508
Using bipolar transistors as the active amplifying circuit
Official title: {using bipolar transistors as the active amplifying circuit (H03F3/45278 takes precedence)}
H03F3/4508 (Using bipolar transistors as the active amplifying circuit) appears on 1,530 US grants and 1,105 published applications in this corpus.
Search patents in H03F- Granted patents
- 1,530
- Published applications
- 1,105
- Assignees
- 460
- Inventors
- 2,098
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 8 | 0 |
| 1980 | 4 | 0 |
| 1981 | 12 | 0 |
| 1982 | 8 | 0 |
| 1983 | 9 | 0 |
| 1984 | 10 | 0 |
| 1985 | 13 | 0 |
| 1986 | 10 | 0 |
| 1987 | 19 | 0 |
| 1988 | 10 | 0 |
| 1989 | 6 | 0 |
| 1990 | 11 | 0 |
| 1991 | 7 | 0 |
| 1992 | 9 | 0 |
| 1993 | 13 | 0 |
| 1994 | 19 | 0 |
| 1995 | 32 | 0 |
| 1996 | 29 | 0 |
| 1997 | 18 | 0 |
| 1998 | 31 | 0 |
| 1999 | 35 | 0 |
| 2000 | 20 | 0 |
| 2001 | 57 | 11 |
| 2002 | 53 | 70 |
| 2003 | 50 | 54 |
| 2004 | 65 | 48 |
| 2005 | 52 | 70 |
| 2006 | 67 | 63 |
| 2007 | 50 | 60 |
| 2008 | 68 | 55 |
| 2009 | 64 | 58 |
| 2010 | 67 | 43 |
| 2011 | 33 | 26 |
| 2012 | 43 | 25 |
| 2013 | 27 | 29 |
| 2014 | 41 | 29 |
| 2015 | 25 | 30 |
| 2016 | 33 | 22 |
| 2017 | 40 | 45 |
| 2018 | 40 | 36 |
| 2019 | 55 | 58 |
| 2020 | 50 | 63 |
| 2021 | 49 | 41 |
| 2022 | 50 | 26 |
| 2023 | 30 | 39 |
| 2024 | 19 | 31 |
| 2025 | 25 | 35 |
| 2026 | 26 | 38 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H03F 3/45085Long tailed pairs994
- H03F 3/45098Pi types269
- H03F 3/45112Complementary long tailed pairs having parallel inputs and being supplied in parallel59
- H03F 3/45174Mirror types56
- H03F 3/45139Complementary long tailed pairs having parallel inputs and being supplied in series21
- H03F 3/4517Complementary non-cross coupled types15
- H03F 3/45125Complementary pi types having parallel inputs and being supplied in parallel13
- H03F 3/45165Complementary cross coupled types13
All 9 subgroupsShow fewer
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