H01F 3/14
Constrictions
Official title: Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12)
H01F3/14 (Constrictions) appears on 846 US grants and 1,170 published applications in this corpus.
Search patents in H01F- Granted patents
- 846
- Published applications
- 1,170
- Assignees
- 453
- Inventors
- 2,054
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 6 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 10 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 7 | 6 |
| 2002 | 8 | 34 |
| 2003 | 17 | 16 |
| 2004 | 16 | 21 |
| 2005 | 22 | 23 |
| 2006 | 19 | 33 |
| 2007 | 23 | 25 |
| 2008 | 13 | 31 |
| 2009 | 15 | 42 |
| 2010 | 29 | 41 |
| 2011 | 38 | 34 |
| 2012 | 33 | 27 |
| 2013 | 30 | 40 |
| 2014 | 19 | 35 |
| 2015 | 28 | 45 |
| 2016 | 24 | 29 |
| 2017 | 27 | 44 |
| 2018 | 36 | 80 |
| 2019 | 50 | 76 |
| 2020 | 61 | 71 |
| 2021 | 42 | 65 |
| 2022 | 52 | 72 |
| 2023 | 55 | 92 |
| 2024 | 49 | 73 |
| 2025 | 41 | 70 |
| 2026 | 41 | 45 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Power unit27 Aug 2026US 2026/0254365 A1Delta Electronics (Shanghai) Co., Ltd.
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Most cited
By later US patents
- Inductive power coupling with constant voltage output258US 4,800,328 AInductran Corporation · 1989
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