G03B 21/42
Preventing damage to film due to abnormal operation of projector
G03B21/42 (Preventing damage to film due to abnormal operation of projector) appears on 8 US grants and 3 published applications in this corpus.
Search patents in G03B- Granted patents
- 8
- Published applications
- 3
- Assignees
- 5
- Inventors
- 9
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 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 | 1 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 1 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Projector assembly5 May 2026US 12,619,139 B1
- Manufacturing method of wavelength-converting component9 Jan 2024US 11,865,575 B2Coretronic Corporation
- Wavelength-converting component, projection apparatus and manufacturing method of the wavelength-converting component31 Aug 2021US 11,106,123 B2Coretronic Corporation
- Dustproof member for image generation device and image projection apparatus5 Feb 2019US 10,197,894 B2Ricoh Company, Ltd.
- Cinematographic apparatus14 Mar 1978US 4,078,765 ABolex International SA
- Manufacturing method of wavelength-converting component14 Oct 2021US 2021/0318604 A1Coretronic Corporation
- Wavelength-converting component, projection apparatus and manufacturing method of the wavelength-converting component9 Jan 2020US 2020/0012179 A1Coretronic Corporation
- Image generation device and image projection apparatus7 Jun 2018US 2018/0157156 A1Ricoh Company, Ltd.
Most cited
By later US patents
- Turn-off interlock for tape and film machines3US 4,072,879 A1978
- Cinematographic apparatus3US 4,078,765 ABolex International SA · 1978
- Dustproof member for image generation device and image projection apparatus2US 10,197,894 B2Ricoh Company, Ltd. · 2019
- Wavelength-converting component, projection apparatus and manufacturing method of the wavelength-converting component2US 11,106,123 B2Coretronic Corporation · 2021
- Cinematograph projectors2US 3,932,033 AWestrex Company Limited · 1976