G03G 15/02
Apparatus for electrographic processes using a charge pattern: for laying down a
Official title: for laying down a uniform charge, e.g. for sensitising; Corona discharge devices (G03G15/14 takes precedence)
G03G15/02 (Apparatus for electrographic processes using a charge pattern: for laying down a) appears on 3,358 US grants and 2,621 published applications in this corpus.
Search patents in G03G- Granted patents
- 3,358
- Published applications
- 2,621
- Assignees
- 261
- Inventors
- 4,462
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 30 | 0 |
| 1977 | 18 | 0 |
| 1978 | 14 | 0 |
| 1979 | 10 | 0 |
| 1980 | 12 | 0 |
| 1981 | 15 | 0 |
| 1982 | 21 | 0 |
| 1983 | 14 | 0 |
| 1984 | 22 | 0 |
| 1985 | 17 | 0 |
| 1986 | 21 | 0 |
| 1987 | 19 | 0 |
| 1988 | 25 | 0 |
| 1989 | 27 | 0 |
| 1990 | 28 | 0 |
| 1991 | 31 | 0 |
| 1992 | 50 | 0 |
| 1993 | 40 | 0 |
| 1994 | 57 | 0 |
| 1995 | 77 | 0 |
| 1996 | 93 | 0 |
| 1997 | 81 | 0 |
| 1998 | 98 | 0 |
| 1999 | 74 | 0 |
| 2000 | 73 | 0 |
| 2001 | 58 | 27 |
| 2002 | 63 | 63 |
| 2003 | 64 | 71 |
| 2004 | 58 | 68 |
| 2005 | 56 | 69 |
| 2006 | 64 | 91 |
| 2007 | 61 | 127 |
| 2008 | 54 | 118 |
| 2009 | 73 | 94 |
| 2010 | 123 | 115 |
| 2011 | 89 | 115 |
| 2012 | 94 | 132 |
| 2013 | 115 | 137 |
| 2014 | 155 | 108 |
| 2015 | 140 | 105 |
| 2016 | 113 | 124 |
| 2017 | 132 | 139 |
| 2018 | 132 | 158 |
| 2019 | 181 | 136 |
| 2020 | 144 | 99 |
| 2021 | 77 | 90 |
| 2022 | 74 | 87 |
| 2023 | 67 | 92 |
| 2024 | 77 | 98 |
| 2025 | 76 | 85 |
| 2026 | 51 | 73 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G03G 15/0208By contact, friction or induction1,750
- G03G 15/0266Arrangements for controlling the amount of charge851
- G03G 15/0291Corona discharge devices733
- G03G 15/0258Provided with means for the maintenance of the charging apparatus362
- G03G 15/0283Arrangements for supplying power to the sensitising device168
- G03G 15/0275Arrangements for controlling the area of the photoconductor to be charged75
Recent patents
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- Image forming apparatus that charges an image bearing member using a voltage set according to an environmental temperature22 Sep 2026US 12,743,038 B2Canon Kabushiki Kaisha
- Image-forming apparatus generating electrical discharge upstream of transfer portion22 Sep 2026US 12,743,041 B2Canon Kabushiki Kaisha
- System and method for evaluating components using thermography22 Sep 2026US 12,743,762 B2Pratt & Whitney Canada Corp.
- Image forming apparatus8 Oct 2026US 2026/0310115 A1Canon 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.
Most cited
By later US patents
- Image forming apparatus with a contact member contacting an image carrier301US 5,585,896 ARicoh Company, Ltd. · 1996
- Space securing member, developing device, charging device and process cartridge201US 6,385,416 B1Canon Kabushiki Kaisha · 2002
- Charging device135US 4,851,960 ACanon Kabushiki Kaisha · 1989
- Image forming apparatus rotationally driving image bearing member and contact electrifying member of process cartridge and process cartridge comprising image bearing member and contact electrifying member120US 6,714,746 B2Canon Kabushiki Kaisha · 2004
- Electric contact member applying voltage to charger, process cartridge, and image forming apparatus119US 6,954,600 B2Canon Kabushiki Kaisha · 2005