G03B 27/522
Projection optics
Official title: {Projection optics (for electro-photographic copiers in particular G03G15/04)}
G03B27/522 (Projection optics) appears on 432 US grants and 43 published applications in this corpus.
Search patents in G03B- Granted patents
- 432
- Published applications
- 43
- Assignees
- 92
- Inventors
- 641
- Latest grant
- 2 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 21 | 0 |
| 1977 | 16 | 0 |
| 1978 | 28 | 0 |
| 1979 | 16 | 0 |
| 1980 | 19 | 0 |
| 1981 | 21 | 0 |
| 1982 | 33 | 0 |
| 1983 | 41 | 0 |
| 1984 | 34 | 0 |
| 1985 | 21 | 0 |
| 1986 | 23 | 0 |
| 1987 | 19 | 0 |
| 1988 | 15 | 0 |
| 1989 | 8 | 0 |
| 1990 | 14 | 0 |
| 1991 | 14 | 0 |
| 1992 | 12 | 0 |
| 1993 | 15 | 0 |
| 1994 | 7 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 4 |
| 2006 | 1 | 1 |
| 2007 | 3 | 2 |
| 2008 | 1 | 4 |
| 2009 | 1 | 1 |
| 2010 | 2 | 3 |
| 2011 | 1 | 2 |
| 2012 | 3 | 2 |
| 2013 | 4 | 5 |
| 2014 | 2 | 0 |
| 2015 | 0 | 2 |
| 2016 | 8 | 3 |
| 2017 | 2 | 1 |
| 2018 | 1 | 2 |
| 2019 | 3 | 1 |
| 2020 | 3 | 4 |
| 2021 | 2 | 1 |
| 2022 | 0 | 1 |
| 2023 | 1 | 1 |
| 2024 | 0 | 1 |
| 2025 | 2 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Optical device2 Sep 2025US 12,405,548 B2Toshiba Tec Kabushiki Kaisha
- Image forming apparatus18 Feb 2025US 12,228,865 B2Canon Kabushiki Kaisha
- Image forming apparatus3 Jan 2023US 11,543,759 B2Canon Kabushiki Kaisha
- Lens unit, exposure device, reading head, image forming apparatus, and image reading apparatus14 Dec 2021US 11,199,650 B2Oki Electric Industry Co., Ltd.
- Image exposure device and image exposure method9 Nov 2021US 11,169,451 B2FUJIFILM Corporation
- Optical device4 Dec 2025US 2025/0370366 A1Toshiba Tec Kabushiki Kaisha
- Image forming apparatus8 May 2025US 2025/0147448 A1Canon Kabushiki Kaisha
- Optical device8 Aug 2024US 2024/0264549 A1Toshiba Tec Kabushiki Kaisha
- Image forming apparatus2 Mar 2023US 2023/0069503 A1Canon Kabushiki Kaisha
- Printing system using a projection device14 Jul 2022US 2022/0221781 A1OSWAL, Ashok
Most cited
By later US patents
- Microfilm camera having a moving lens70US 4,374,618 AIBM Corporation · 1983
- Linear driving apparatus70US 5,208,497 ASharp Kabushiki Kaisha · 1993
- Uniformly intense imaging by close-packed lens array57US 4,447,126 AInternational Business Machines Corporation · 1984
- Copying apparatus for copying a plurality of original surfaces with a single scan41US 4,017,173 ACanon Kabushiki Kaisha · 1977
- Compact erect optical imaging copier system and method40US 4,168,900 AMinolta Camera Kabushiki Kaisha · 1979