A61F 9/022
Use of special optical filters
Official title: {Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs (optical filters per se G02B5/20)}
A61F9/022 (Use of special optical filters) appears on 285 US grants and 231 published applications in this corpus.
Search patents in A61F- Granted patents
- 285
- Published applications
- 231
- Assignees
- 181
- Inventors
- 554
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 5 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 11 | 0 |
| 1993 | 7 | 0 |
| 1994 | 9 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 7 | 0 |
| 1998 | 12 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 6 | 1 |
| 2002 | 4 | 3 |
| 2003 | 3 | 3 |
| 2004 | 3 | 5 |
| 2005 | 4 | 11 |
| 2006 | 6 | 5 |
| 2007 | 4 | 3 |
| 2008 | 4 | 5 |
| 2009 | 3 | 9 |
| 2010 | 6 | 7 |
| 2011 | 7 | 6 |
| 2012 | 4 | 11 |
| 2013 | 6 | 10 |
| 2014 | 4 | 14 |
| 2015 | 7 | 10 |
| 2016 | 8 | 15 |
| 2017 | 8 | 16 |
| 2018 | 13 | 13 |
| 2019 | 11 | 17 |
| 2020 | 15 | 12 |
| 2021 | 15 | 12 |
| 2022 | 10 | 8 |
| 2023 | 7 | 8 |
| 2024 | 7 | 14 |
| 2025 | 8 | 9 |
| 2026 | 5 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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Most cited
By later US patents
- Intelligent electro-optical system and method for automatic glare reduction598US 5,305,012 AReveo, Inc. · 1994
- Fiber optic ocular endoscope428US 4,607,622 A1986
- Spectacle lens having continuously variable controlled density and fast response time257US 4,279,474 A1981
- Optical lens structure and control system for maintaining a selected constant level of transmitted light at a wearer's eyes218US 5,654,786 A1997
- Eyewear for ballistic and light protection216US 6,637,877 B1Gentex Corporation · 2003