G03B 27/725
Optical projection devices wherein the contrast is controlled electrically
Official title: {Optical projection devices wherein the contrast is controlled electrically (e.g. cathode ray tube masking)}
G03B27/725 (Optical projection devices wherein the contrast is controlled electrically) appears on 70 US grants and 8 published applications in this corpus.
Search patents in G03B- Granted patents
- 70
- Published applications
- 8
- Assignees
- 27
- Inventors
- 107
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
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| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 6 | 0 |
| 1996 | 4 | 0 |
| 1997 | 7 | 0 |
| 1998 | 5 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 2 | 2 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 1 |
| 2020 | 1 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 2 |
| 2023 | 0 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Method and apparatus for exposure control in light valves93US 5,132,723 ACreo Products Inc. · 1992
- Method and apparatus for producing modified photographic prints88US 4,933,754 ACiba-Geigy Corporation · 1990
- Apparatus and method for enhancement of image viewing by modulated illumination of a transparency62US 4,908,876 ADigivision, Inc. · 1990
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- Video printer for making video image hard copies37US 4,965,662 AFuji Photo Film Co., Ltd. · 1990