F21S 41/321
The reflector being a surface of revolution or a planar surface
Official title: {the reflector being a surface of revolution or a planar surface, e.g. truncated}
F21S41/321 (The reflector being a surface of revolution or a planar surface) appears on 988 US grants and 997 published applications in this corpus.
Search patents in F21S- Granted patents
- 988
- Published applications
- 997
- Assignees
- 234
- Inventors
- 1,447
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 6 | 0 |
| 1987 | 8 | 0 |
| 1988 | 5 | 0 |
| 1989 | 7 | 0 |
| 1990 | 8 | 0 |
| 1991 | 9 | 0 |
| 1992 | 9 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 5 | 0 |
| 2000 | 4 | 0 |
| 2001 | 1 | 8 |
| 2002 | 10 | 11 |
| 2003 | 11 | 12 |
| 2004 | 6 | 17 |
| 2005 | 8 | 17 |
| 2006 | 19 | 35 |
| 2007 | 21 | 33 |
| 2008 | 26 | 23 |
| 2009 | 22 | 17 |
| 2010 | 18 | 18 |
| 2011 | 12 | 19 |
| 2012 | 12 | 27 |
| 2013 | 26 | 41 |
| 2014 | 37 | 45 |
| 2015 | 34 | 60 |
| 2016 | 45 | 49 |
| 2017 | 53 | 76 |
| 2018 | 64 | 64 |
| 2019 | 94 | 78 |
| 2020 | 77 | 53 |
| 2021 | 54 | 51 |
| 2022 | 53 | 68 |
| 2023 | 56 | 50 |
| 2024 | 44 | 55 |
| 2025 | 56 | 41 |
| 2026 | 27 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
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