H01F 21/02
Continuously variable
Official title: continuously variable, e.g. variometers
H01F21/02 (Continuously variable) appears on 332 US grants and 284 published applications in this corpus.
Search patents in H01F- Granted patents
- 332
- Published applications
- 284
- Assignees
- 256
- Inventors
- 680
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 7 | 0 |
| 1978 | 4 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 6 | 0 |
| 1982 | 4 | 0 |
| 1983 | 7 | 0 |
| 1984 | 6 | 0 |
| 1985 | 9 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 4 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 1 |
| 2002 | 3 | 7 |
| 2003 | 5 | 3 |
| 2004 | 4 | 11 |
| 2005 | 5 | 6 |
| 2006 | 7 | 18 |
| 2007 | 9 | 12 |
| 2008 | 11 | 11 |
| 2009 | 8 | 13 |
| 2010 | 7 | 9 |
| 2011 | 11 | 15 |
| 2012 | 9 | 7 |
| 2013 | 11 | 5 |
| 2014 | 6 | 17 |
| 2015 | 11 | 12 |
| 2016 | 9 | 14 |
| 2017 | 15 | 22 |
| 2018 | 11 | 7 |
| 2019 | 15 | 13 |
| 2020 | 7 | 16 |
| 2021 | 21 | 11 |
| 2022 | 10 | 13 |
| 2023 | 14 | 17 |
| 2024 | 15 | 9 |
| 2025 | 10 | 11 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Tunable integrated voltage regulator25 Aug 2026US 12,719,362 B2APPLIED Materials.Inc.
- Device having a multimode antenna with variable width of conductive wire27 Jan 2026US 12,537,132 B2NuCurrent, Inc.
- Lossless continuously adjustable devices16 Dec 2025US 12,498,022 B2Cambridge Enterprise Limited
- Wireless power transmission device and operating method therefor4 Nov 2025US 12,463,471 B2Samsung Electronics Co., Ltd.
- EMC filter for electromagnetic regulation of converter and manufacturing method thereof14 Oct 2025US 12,445,049 B2Hyundai Mobis Co., Ltd.
- Device Having a Multimode Antenna With Variable Width of Conductive Wire17 Sep 2026US 2026/0279661 A1NuCurrent, Inc.
- System and method for high efficiency wide-voltage-gain power conversion19 Mar 2026US 2026/0081516 A1Arizona Board of Regents on behalf of Arizona State University
- Superconducting tunable inductance12 Mar 2026US 2026/0074102 A1D-Wave Systems Inc.
- Planar coil array and displacement sensor15 Jan 2026US 2026/0016277 A1Hitachi Astemo, Ltd.
- Simultaneous wound solenoid position indicator and nuclear power plant comprising same25 Dec 2025US 2025/0391580 A1Korea Atomic Energy Research Institute
Most cited
By later US patents
- Intravascular pressure and flow sensor523US 5,873,835 ASciMed Life Systems, Inc. · 1999
- Inductive structures for semiconductor integrated circuits217US 5,095,357 AMitsubishi Denki Kabushiki Kaisha · 1992
- Resonant converter with controlled inductor145US 5,684,678 ADelco Electronics Corporation · 1997
- Orthogonal-field electrically variable magnetic device79US 5,534,837 ARockwell International Corporation · 1996
- Self isolating high frequency saturable reactor67US 5,770,982 ASematech, Inc. · 1998