H01F 1/44
Magnets or magnetic bodies characterised by the magnetic materials therefor: of magnetic
Official title: of magnetic liquids, e.g. ferrofluids (particles in a bonding agent H01F1/28, H01F1/36, {H01F1/37})
H01F1/44 (Magnets or magnetic bodies characterised by the magnetic materials therefor: of magnetic) appears on 539 US grants and 434 published applications in this corpus.
Search patents in H01F- Granted patents
- 539
- Published applications
- 434
- Assignees
- 346
- Inventors
- 1,209
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 8 | 0 |
| 1984 | 6 | 0 |
| 1985 | 1 | 0 |
| 1986 | 8 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 7 | 0 |
| 1990 | 9 | 0 |
| 1991 | 8 | 0 |
| 1992 | 10 | 0 |
| 1993 | 7 | 0 |
| 1994 | 6 | 0 |
| 1995 | 6 | 0 |
| 1996 | 16 | 0 |
| 1997 | 16 | 0 |
| 1998 | 18 | 0 |
| 1999 | 23 | 0 |
| 2000 | 16 | 0 |
| 2001 | 13 | 4 |
| 2002 | 12 | 8 |
| 2003 | 16 | 23 |
| 2004 | 20 | 24 |
| 2005 | 12 | 17 |
| 2006 | 9 | 15 |
| 2007 | 5 | 12 |
| 2008 | 11 | 10 |
| 2009 | 6 | 11 |
| 2010 | 5 | 20 |
| 2011 | 9 | 15 |
| 2012 | 15 | 18 |
| 2013 | 15 | 23 |
| 2014 | 16 | 11 |
| 2015 | 9 | 19 |
| 2016 | 10 | 18 |
| 2017 | 16 | 19 |
| 2018 | 14 | 10 |
| 2019 | 13 | 23 |
| 2020 | 22 | 21 |
| 2021 | 19 | 20 |
| 2022 | 17 | 24 |
| 2023 | 19 | 20 |
| 2024 | 21 | 17 |
| 2025 | 11 | 18 |
| 2026 | 12 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Anisotropic iron nitride permanent magnets6 Oct 2026US 12,755,878 B2Niron Magnetics, Inc.
- Directional control on a microfluidic chip30 Jun 2026US 12,667,842 B2Seagate Technology LLC
- Magnetic liquid metal processing method, liquid gripper and manipulation method23 Jun 2026US 12,662,334 B2Suzhou University
- Magnetorheological fluid2 Jun 2026US 12,646,643 B2Honda Motor Co., Ltd.
- Combining electropermanent magnets and magnetorheological fluid to modify an operation of an input device21 Apr 2026US 12,608,088 B2Logitech Europe S. A.
- Magnetic material, magnetic fluid, standard sample for particle size distribution measurement, method for producing a magnetic material and method for producing a magnetic fluid1 Oct 2026US 2026/0302021 A1Somar Corporation
- Magnetic Fluid Composition1 Oct 2026US 2026/0302022 A1Seiko Epson Corporation
- Magnetic Fluid Composition1 Oct 2026US 2026/0302023 A1Seiko Epson Corporation
- Magnetic Fluid Composition17 Sep 2026US 2026/0279634 A1Seiko Epson Corporation
- Real-time updateable ferrofluid specular holographic display10 Sep 2026US 2026/0268869 A1Lenovo Global Technology (United States) Inc.
Most cited
By later US patents
- Intravascular pressure and flow sensor523US 5,873,835 ASciMed Life Systems, Inc. · 1999
- Magnetic iron-dextran microspheres466US 4,452,773 ACanadian Patents and Development Limited · 1984
- Magnetorheological fluid devices267US 5,284,330 ALord Corporation · 1994
- Magnetorheological fluid dampers244US 5,277,281 ALord Corporation · 1994
- Magnetorheological materials based on alloy particles186US 5,382,373 ALord Corporation · 1995