H01F 29/14
Variable transformers or inductances not covered by group h01f21/00: with variable magnetic
Official title: with variable magnetic bias
H01F29/14 (Variable transformers or inductances not covered by group h01f21/00: with variable magnetic) appears on 329 US grants and 167 published applications in this corpus.
Search patents in H01F- Granted patents
- 329
- Published applications
- 167
- Assignees
- 181
- Inventors
- 544
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 14 | 0 |
| 1978 | 7 | 0 |
| 1979 | 10 | 0 |
| 1980 | 8 | 0 |
| 1981 | 7 | 0 |
| 1982 | 7 | 0 |
| 1983 | 8 | 0 |
| 1984 | 7 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 5 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 7 | 0 |
| 1995 | 4 | 0 |
| 1996 | 10 | 0 |
| 1997 | 3 | 0 |
| 1998 | 11 | 0 |
| 1999 | 11 | 0 |
| 2000 | 14 | 0 |
| 2001 | 11 | 6 |
| 2002 | 14 | 24 |
| 2003 | 9 | 5 |
| 2004 | 14 | 12 |
| 2005 | 12 | 6 |
| 2006 | 7 | 4 |
| 2007 | 7 | 7 |
| 2008 | 6 | 8 |
| 2009 | 2 | 5 |
| 2010 | 3 | 2 |
| 2011 | 4 | 6 |
| 2012 | 3 | 3 |
| 2013 | 6 | 8 |
| 2014 | 0 | 8 |
| 2015 | 8 | 4 |
| 2016 | 3 | 3 |
| 2017 | 4 | 11 |
| 2018 | 12 | 12 |
| 2019 | 9 | 9 |
| 2020 | 11 | 4 |
| 2021 | 4 | 6 |
| 2022 | 5 | 5 |
| 2023 | 3 | 3 |
| 2024 | 2 | 2 |
| 2025 | 3 | 3 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Transformer-hybrid variable reactance6 Oct 2026US 12,754,576 B2Clark Power Systems, Inc.
- Coil component3 Mar 2026US 12,567,531 B2Murata Manufacturing Co., Ltd.
- Electrical power transformation system and process15 Apr 2025US 12,278,042 B2Ionate Limited
- Magnetically controllable choke coil having central connection8 Apr 2025US 12,272,490 B2Siemens Energy Global GmbH & Co. KG
- Multi-phase transformer28 Jan 2025US 12,211,640 B2Fanuc Corporation
- Magnetic component29 Jan 2026US 2026/0031270 A1Delta Electronics, Inc.
- Multi-core segment variable inductor with different core materials, and control circuit and control method thereof7 Aug 2025US 2025/0253081 A1Guangdong University of Technology
- Electrical power transformation system and process26 Jun 2025US 2025/0206741 A1Ionate Limited
- Tunable inductor and methods to realize tunable inductor24 Apr 2025US 2025/0132088 A1Hamilton Sundstrand Corporation
- Charging Station for Electric Vehicles15 Aug 2024US 2024/0270093 A1Siemens Aktiengesellschaft
Most cited
By later US patents
- Vacuum processing chamber having multi-mode access485US 6,095,083 AApplied Materiels, Inc. · 2000
- Silicon scavenger in an inductively coupled RF plasma reactor249US 5,556,501 AAPPLIED Materials.Inc. · 1996
- Integrated-magnetic apparatus210US 5,726,615 A1998
- Inductively coupled RF plasma reactor having an overhead solenoidal antenna and modular confinement magnet liners190US 6,074,512 AAPPLIED Materials.Inc. · 2000
- Resonant converter with controlled inductor145US 5,684,678 ADelco Electronics Corporation · 1997