H01F 41/026
Protecting methods against environmental influences
Official title: {protecting methods against environmental influences, e.g. oxygen, by surface treatment (magnetic particles with skin H01F1/061, H01F1/09, H01F1/24, H01F1/33 and G11B5/706)}
H01F41/026 (Protecting methods against environmental influences) appears on 210 US grants and 199 published applications in this corpus.
Search patents in H01F- Granted patents
- 210
- Published applications
- 199
- Assignees
- 104
- Inventors
- 481
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 8 | 0 |
| 1990 | 6 | 0 |
| 1991 | 4 | 0 |
| 1992 | 6 | 0 |
| 1993 | 2 | 0 |
| 1994 | 10 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 9 | 2 |
| 2002 | 12 | 15 |
| 2003 | 4 | 8 |
| 2004 | 8 | 11 |
| 2005 | 8 | 12 |
| 2006 | 2 | 9 |
| 2007 | 10 | 11 |
| 2008 | 9 | 13 |
| 2009 | 4 | 9 |
| 2010 | 8 | 12 |
| 2011 | 7 | 10 |
| 2012 | 7 | 9 |
| 2013 | 5 | 5 |
| 2014 | 4 | 5 |
| 2015 | 5 | 2 |
| 2016 | 5 | 9 |
| 2017 | 5 | 6 |
| 2018 | 7 | 7 |
| 2019 | 4 | 6 |
| 2020 | 5 | 3 |
| 2021 | 6 | 7 |
| 2022 | 3 | 6 |
| 2023 | 5 | 7 |
| 2024 | 7 | 6 |
| 2025 | 4 | 4 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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