F21S 4/28
Rigid
Official title: rigid, e.g. LED bars
F21S4/28 (Rigid) appears on 1,563 US grants and 1,799 published applications in this corpus.
Search patents in F21S- Granted patents
- 1,563
- Published applications
- 1,799
- Assignees
- 773
- Inventors
- 2,834
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 10 | 0 |
| 2001 | 4 | 1 |
| 2002 | 10 | 16 |
| 2003 | 15 | 14 |
| 2004 | 9 | 10 |
| 2005 | 8 | 22 |
| 2006 | 7 | 14 |
| 2007 | 23 | 14 |
| 2008 | 7 | 37 |
| 2009 | 10 | 47 |
| 2010 | 27 | 58 |
| 2011 | 36 | 84 |
| 2012 | 39 | 82 |
| 2013 | 41 | 71 |
| 2014 | 74 | 90 |
| 2015 | 61 | 78 |
| 2016 | 73 | 77 |
| 2017 | 85 | 114 |
| 2018 | 102 | 111 |
| 2019 | 129 | 129 |
| 2020 | 120 | 116 |
| 2021 | 149 | 143 |
| 2022 | 123 | 140 |
| 2023 | 132 | 97 |
| 2024 | 112 | 91 |
| 2025 | 91 | 86 |
| 2026 | 53 | 57 |
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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- Smart light bulb852US 6,528,954 B1Color Kinetics Incorporated · 2003