G03G 13/01
Electrographic processes using a charge pattern: for multicoloured copies
Official title: for multicoloured copies {(colour correction on photography G03B27/725; picture communication systems H04N1/46)}
G03G13/01 (Electrographic processes using a charge pattern: for multicoloured copies) appears on 429 US grants and 152 published applications in this corpus.
Search patents in G03G- Granted patents
- 429
- Published applications
- 152
- Assignees
- 89
- Inventors
- 800
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 7 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 5 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 9 | 0 |
| 1986 | 8 | 0 |
| 1987 | 7 | 0 |
| 1988 | 12 | 0 |
| 1989 | 18 | 0 |
| 1990 | 19 | 0 |
| 1991 | 29 | 0 |
| 1992 | 21 | 0 |
| 1993 | 20 | 0 |
| 1994 | 15 | 0 |
| 1995 | 9 | 0 |
| 1996 | 13 | 0 |
| 1997 | 15 | 0 |
| 1998 | 23 | 0 |
| 1999 | 20 | 0 |
| 2000 | 17 | 0 |
| 2001 | 9 | 7 |
| 2002 | 12 | 14 |
| 2003 | 15 | 26 |
| 2004 | 9 | 11 |
| 2005 | 9 | 6 |
| 2006 | 10 | 6 |
| 2007 | 2 | 0 |
| 2008 | 3 | 9 |
| 2009 | 2 | 3 |
| 2010 | 4 | 2 |
| 2011 | 2 | 5 |
| 2012 | 3 | 0 |
| 2013 | 3 | 5 |
| 2014 | 5 | 6 |
| 2015 | 8 | 3 |
| 2016 | 3 | 5 |
| 2017 | 4 | 3 |
| 2018 | 5 | 7 |
| 2019 | 6 | 4 |
| 2020 | 6 | 4 |
| 2021 | 2 | 7 |
| 2022 | 9 | 6 |
| 2023 | 2 | 3 |
| 2024 | 3 | 2 |
| 2025 | 1 | 5 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Toner, resin particles, developer, toner storage unit, image forming apparatus, method for producing toner, and image forming method14 Apr 2026US 12,601,986 B2Ricoh Company, Ltd.
- Electrostatic charge image developing green toner, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method7 Apr 2026US 12,596,313 B2FUJIFILM Business Innovation Corp.
- Image forming apparatus18 Nov 2025US 12,474,648 B2Oki Electric Industry Co., Ltd.
- Photoluminescent toner, electrostatic charge image developer, and toner cartridge17 Dec 2024US 12,169,389 B2FUJIFILM Business Innovation Corp.
- Electrophotographic printing devices, systems, and methods20 Aug 2024US 12,066,776 B2Neenah, Inc.
- Image forming apparatus25 Jun 2026US 2026/0177943 A1FUJIFILM Business Innovation Corp.
- Image forming apparatus, non-transitory computer readable medium storing program, and image forming method12 Mar 2026US 2026/0072390 A1FUJIFILM Business Innovation Corp.
- Image forming system, non-transitory computer readable medium storing program, and image forming method26 Feb 2026US 2026/0056502 A1FUJIFILM Business Innovation Corp.
- Image forming apparatus4 Dec 2025US 2025/0370378 A1FUJIFILM Business Innovation Corp.
- Image forming apparatus4 Dec 2025US 2025/0370388 A1FUJIFILM Business Innovation Corp.
Most cited
By later US patents
- Method for two-color development of a xerographic charge pattern154US 4,078,929 AXerox Corporation · 1978
- Toner developed electrostatic imaging process for outdoor signs83US 5,262,259 AMinnesota Mining and Manufacturing Company · 1993
- Electrophotographic image formation process and apparatus81US 6,360,068 B1Fujitsu Limited · 2002
- Toner for dry developing79US 6,074,794 ARicoh Company, Ltd. · 2000
- Offset transfer of toner images in electrography70US 5,108,865 AMinnesota Mining and Manufacturing Company · 1992