H01F 7/20
Without armatures
Official title: without armatures (cores H01F3/00; coils H01F5/00 {; shaping metal by applying magnetic forces B21D26/14; electromagnets specially adapted for NMR applications G01R33/381})
H01F7/20 (Without armatures) appears on 1,009 US grants and 983 published applications in this corpus.
Search patents in H01F- Granted patents
- 1,009
- Published applications
- 983
- Assignees
- 669
- Inventors
- 2,367
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 10 | 0 |
| 1978 | 18 | 0 |
| 1979 | 6 | 0 |
| 1980 | 11 | 0 |
| 1981 | 5 | 0 |
| 1982 | 7 | 0 |
| 1983 | 2 | 0 |
| 1984 | 13 | 0 |
| 1985 | 14 | 0 |
| 1986 | 8 | 0 |
| 1987 | 19 | 0 |
| 1988 | 16 | 0 |
| 1989 | 24 | 0 |
| 1990 | 14 | 0 |
| 1991 | 11 | 0 |
| 1992 | 9 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 7 | 0 |
| 1998 | 5 | 0 |
| 1999 | 11 | 0 |
| 2000 | 12 | 0 |
| 2001 | 7 | 3 |
| 2002 | 13 | 1 |
| 2003 | 5 | 11 |
| 2004 | 12 | 13 |
| 2005 | 9 | 18 |
| 2006 | 12 | 17 |
| 2007 | 5 | 9 |
| 2008 | 11 | 26 |
| 2009 | 8 | 28 |
| 2010 | 11 | 23 |
| 2011 | 19 | 16 |
| 2012 | 19 | 22 |
| 2013 | 21 | 17 |
| 2014 | 18 | 19 |
| 2015 | 22 | 52 |
| 2016 | 28 | 54 |
| 2017 | 46 | 58 |
| 2018 | 51 | 51 |
| 2019 | 50 | 74 |
| 2020 | 60 | 66 |
| 2021 | 52 | 71 |
| 2022 | 70 | 85 |
| 2023 | 54 | 71 |
| 2024 | 64 | 80 |
| 2025 | 72 | 54 |
| 2026 | 25 | 44 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Magnetic field nulling6 Oct 2026US 12,755,881 B2Shimadzu Corporation
- Magnetic device for sorting biological objects29 Sep 2026US 12,749,606 B2Applied Cells Inc.
- Operating device intended to be installed in a vehicle15 Sep 2026US 12,739,983 B2Behr-Hella Thermocontrol GmbH
- Substrate processing system and substrate transfer method8 Sep 2026US 12,733,437 B2Tokyo Electron Limited
- Pulsed electromagnetic field system25 Aug 2026US 12,714,874 B2Hofmeir Magnetics Limited
- Space electromagnetic field generator and freshness maintenance device using the same8 Oct 2026US 2026/0311923 A1
- Magnetism generation coil that provides non-invasive treatment24 Sep 2026US 2026/0290668 A1Remed Brainstim Co., Ltd.
- Self-adaptive cooling system for moving coil of high-thrust electrodynamic vibration table and control method thereof27 Aug 2026US 2026/0251527 A1China University of Mining and Technology
- Magnetic clamping device20 Aug 2026US 2026/0241625 A1Kosmek Ltd.
- Medication Delivery Device13 Aug 2026US 2026/0232976 A1National University Corporation, Iwate University
Most cited
By later US patents
- Magnetic arrays171US 5,631,618 AMassachusetts Institute of Technology · 1997
- System and method for magnetic scanning, accelerating, and implanting of an ion beam122US 5,483,077 ANissin Electric Co., Ltd. · 1996
- Electromagnet and magnetic field generating apparatus109US 6,365,894 B2Hitachi, Ltd. · 2002
- Electromagnet and magnetic field generating apparatus108US 6,236,043 B1Hitachi, Ltd. · 2001
- Ferrofluidic cooling and acoustical noise reduction in magnetic stimulators108US 7,396,326 B2Neuronetics, Inc. · 2008