G03G 15/0291
Corona discharge devices
Official title: {corona discharge devices, e.g. wires, pointed electrodes, means for cleaning the corona discharge device}
G03G15/0291 (Corona discharge devices) appears on 733 US grants and 394 published applications in this corpus.
Search patents in G03G- Granted patents
- 733
- Published applications
- 394
- Assignees
- 120
- Inventors
- 1,227
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 21 | 0 |
| 1977 | 11 | 0 |
| 1978 | 13 | 0 |
| 1979 | 6 | 0 |
| 1980 | 11 | 0 |
| 1981 | 9 | 0 |
| 1982 | 10 | 0 |
| 1983 | 4 | 0 |
| 1984 | 9 | 0 |
| 1985 | 10 | 0 |
| 1986 | 15 | 0 |
| 1987 | 13 | 0 |
| 1988 | 19 | 0 |
| 1989 | 16 | 0 |
| 1990 | 10 | 0 |
| 1991 | 16 | 0 |
| 1992 | 23 | 0 |
| 1993 | 16 | 0 |
| 1994 | 18 | 0 |
| 1995 | 19 | 0 |
| 1996 | 23 | 0 |
| 1997 | 13 | 0 |
| 1998 | 23 | 0 |
| 1999 | 19 | 0 |
| 2000 | 13 | 0 |
| 2001 | 14 | 3 |
| 2002 | 15 | 6 |
| 2003 | 11 | 17 |
| 2004 | 12 | 14 |
| 2005 | 7 | 13 |
| 2006 | 18 | 22 |
| 2007 | 18 | 23 |
| 2008 | 11 | 22 |
| 2009 | 12 | 29 |
| 2010 | 26 | 33 |
| 2011 | 24 | 21 |
| 2012 | 20 | 35 |
| 2013 | 23 | 35 |
| 2014 | 53 | 21 |
| 2015 | 32 | 10 |
| 2016 | 10 | 7 |
| 2017 | 13 | 17 |
| 2018 | 11 | 10 |
| 2019 | 15 | 9 |
| 2020 | 8 | 4 |
| 2021 | 2 | 2 |
| 2022 | 3 | 3 |
| 2023 | 2 | 3 |
| 2024 | 4 | 10 |
| 2025 | 6 | 6 |
| 2026 | 3 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electrophotographic conductive roller, process cartridge, and electrophotographic image forming apparatus15 Sep 2026US 12,736,893 B2Canon Kabushiki Kaisha
- Electrophotographic roller, process cartridge, electrophotographic image forming apparatus, and method for manufacturing electrophotographic roller11 Aug 2026US 12,704,799 B2Canon Kabushiki Kaisha
- Charge removing apparatus of sheet in image forming apparatus, method of controlling the same, and storage medium19 May 2026US 12,631,997 B2Canon Kabushiki Kaisha
- Image forming apparatus4 Nov 2025US 12,461,486 B2Konica Minolta, Inc.
- Movable member and image forming apparatus19 Aug 2025US 12,393,134 B2Canon Kabushiki Kaisha
- Charging device and image forming apparatus1 Oct 2026US 2026/0299455 A1FUJIFILM Business Innovation Corp.
- Charging device and image forming apparatus1 Oct 2026US 2026/0299456 A1FUJIFILM Business Innovation Corp.
- Charging device and image forming apparatus1 Oct 2026US 2026/0299457 A1FUJIFILM Business Innovation Corp.
- Charging device and image forming apparatus1 Oct 2026US 2026/0299458 A1FUJIFILM Business Innovation Corp.
- Cleaning apparatus and image forming apparatus27 Aug 2026US 2026/0251995 A1KYOCERA Document Solutions Inc.
Most cited
By later US patents
- Corona charging device68US 4,086,650 AXerox Corporation · 1978
- Contaminant preventing structure for image forming apparatus and process cartridge65US 6,385,414 B1Brother Kogyo Kabushiki Kaisha · 2002
- Printing system58US 6,438,352 B1Indigo N.V. · 2002
- Electrostatic charging apparatus and method54US 5,118,942 A1992
- Image-forming apparatus comprising a process unit40US 5,835,822 AFujitsu Limited · 1998