H01F
Magnets
Official title: Magnets; inductances; transformers; selection of materials for their magnetic properties
H01F (Magnets) appears on 45,267 US grants and 45,848 published applications in this corpus.
Search patents in H01F- Granted patents
- 45,267
- Published applications
- 45,848
- Assignees
- 10,260
- Inventors
- 69,602
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 351 | 0 |
| 1977 | 318 | 0 |
| 1978 | 314 | 0 |
| 1979 | 265 | 0 |
| 1980 | 293 | 0 |
| 1981 | 320 | 0 |
| 1982 | 315 | 0 |
| 1983 | 297 | 0 |
| 1984 | 348 | 0 |
| 1985 | 403 | 0 |
| 1986 | 320 | 0 |
| 1987 | 415 | 0 |
| 1988 | 343 | 0 |
| 1989 | 460 | 0 |
| 1990 | 440 | 0 |
| 1991 | 442 | 0 |
| 1992 | 404 | 0 |
| 1993 | 386 | 0 |
| 1994 | 431 | 0 |
| 1995 | 447 | 0 |
| 1996 | 474 | 0 |
| 1997 | 453 | 0 |
| 1998 | 570 | 0 |
| 1999 | 586 | 0 |
| 2000 | 640 | 0 |
| 2001 | 675 | 261 |
| 2002 | 762 | 941 |
| 2003 | 820 | 945 |
| 2004 | 833 | 1146 |
| 2005 | 790 | 996 |
| 2006 | 846 | 1060 |
| 2007 | 724 | 1044 |
| 2008 | 659 | 1177 |
| 2009 | 665 | 1306 |
| 2010 | 911 | 1403 |
| 2011 | 979 | 1339 |
| 2012 | 1060 | 1537 |
| 2013 | 1125 | 1816 |
| 2014 | 1205 | 2106 |
| 2015 | 1379 | 2345 |
| 2016 | 1602 | 2213 |
| 2017 | 1932 | 2301 |
| 2018 | 1918 | 2588 |
| 2019 | 2305 | 2788 |
| 2020 | 2268 | 2806 |
| 2021 | 2115 | 2655 |
| 2022 | 2188 | 2657 |
| 2023 | 2118 | 2371 |
| 2024 | 2186 | 2427 |
| 2025 | 1944 | 2071 |
| 2026 | 1223 | 1549 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- H01F 27/00Details of transformers or inductances, in general15,342
- H01F 41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or10,840
- H01F 1/00Magnets or magnetic bodies characterised by the magnetic materials therefor8,420
- H01F 7/00Magnets8,277
- H01F 38/00Adaptations of transformers or inductances for specific applications or functions7,181
- H01F 17/00Fixed inductances of the signal type7,130
- H01F 10/00Thin magnetic films4,278
- H01F 5/00Coils2,662
All 17 main groupsShow fewer
- H01F 3/00Cores, yokes, or armatures2,543
- H01F 6/00Superconducting magnets1,865
- H01F 30/00Fixed transformers not covered by group h01f19/001,065
- H01F 29/00Variable transformers or inductances not covered by group h01f21/00858
- H01F 37/00Fixed inductances not covered by group h01f17/00849
- H01F 21/00Variable inductances or transformers of the signal type699
- H01F 13/00Apparatus or processes for magnetising or demagnetising684
- H01F 19/00Fixed transformers or mutual inductances of the signal type651
- H01F 36/00Transformers with superconductive windings or with windings operating at cryogenic temperature54
Recent patents
- Dispersed iron oxide magnetic powder slurry and method for producing same6 Oct 2026US 12,753,089 B2Dowa Electronics Materials Co., Ltd.
- Soft magnetic alloy powder and production method therefor6 Oct 2026US 12,753,473 B2Mitsubishi Steel Mfg. Co., Ltd.
- Method and composition for lightning protection6 Oct 2026US 12,753,547 B2
- Systems and methods for a remote control actuator6 Oct 2026US 12,753,743 B2Trustees of Tufts College
- Monitoring a transformer comprising a tap changer6 Oct 2026US 12,754,255 B2Hitachi Energy Ltd
- Microelectromechanical systems (mems) actuator with magnetic latching and methods for manufacturing and using the same8 Oct 2026US 2026/0307980 A1Atomic Machines, Inc.
- Method for producing insulation coating treatment liquid for grain-oriented electrical steel sheet and method for producing grain-oriented electrical steel sheet8 Oct 2026US 2026/0308387 A1Nippon Steel Corporation
- Low iron loss fe-based amorphous alloy having high saturation magnetization value8 Oct 2026US 2026/0308737 A1Chang Sung Co.
- Additive manufacturing polymers with high metal inclusion content8 Oct 2026US 2026/0308813 A1The Research Foundation for The State University of New York
- Systems and methods for deploying and retrieving magnetically coupled temporary wireline fiber for broadside wave detection8 Oct 2026US 2026/0309022 A1
Most cited
By later US patents
- Surgical system instrument sterile adapter1,479US 9,096,033 B2Intuitive Surgical Operations, Inc. · 2015
- Combined position sensor and magnetic motor or bearing1,212US 4,652,820 ANorth American Philips Corporation · 1987
- Magnetically shielded assembly1,099US 7,091,412 B2Nanoset, LLC · 2006
- Magnetic device with optimized heat confinement1,021US 8,411,500 B2Crocus Technology SA · 2013
- Surgical sterilizer with integrated battery charging device1,015US 8,258,745 B2Syntheon, LLC · 2012