G03G 9/108
Ferrite carrier
Official title: {Ferrite carrier, e.g. magnetite}
G03G9/108 (Ferrite carrier) appears on 391 US grants and 327 published applications in this corpus.
Search patents in G03G- Granted patents
- 391
- Published applications
- 327
- Assignees
- 71
- Inventors
- 739
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 5 | 0 |
| 1990 | 8 | 0 |
| 1991 | 1 | 0 |
| 1992 | 6 | 0 |
| 1993 | 3 | 0 |
| 1994 | 11 | 0 |
| 1995 | 6 | 0 |
| 1996 | 13 | 0 |
| 1997 | 12 | 0 |
| 1998 | 12 | 0 |
| 1999 | 7 | 0 |
| 2000 | 23 | 0 |
| 2001 | 13 | 4 |
| 2002 | 5 | 8 |
| 2003 | 13 | 17 |
| 2004 | 7 | 11 |
| 2005 | 4 | 11 |
| 2006 | 6 | 19 |
| 2007 | 8 | 18 |
| 2008 | 11 | 13 |
| 2009 | 9 | 15 |
| 2010 | 10 | 16 |
| 2011 | 14 | 14 |
| 2012 | 12 | 18 |
| 2013 | 19 | 21 |
| 2014 | 21 | 21 |
| 2015 | 17 | 12 |
| 2016 | 13 | 11 |
| 2017 | 13 | 6 |
| 2018 | 8 | 10 |
| 2019 | 8 | 12 |
| 2020 | 8 | 6 |
| 2021 | 8 | 5 |
| 2022 | 1 | 24 |
| 2023 | 6 | 8 |
| 2024 | 8 | 9 |
| 2025 | 14 | 6 |
| 2026 | 4 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Carrier core material and electrophotographic development carrier using same and electrophotographic developer6 Oct 2026US 12,754,491 B2Dowa Electronics Materials Co., Ltd.
- Carrier core material, and electrophotographic development carrier and electrophotographic developer using same28 Jul 2026US 12,693,608 B2Dowa Electronics Materials Co., Ltd.
- Carrier for electrophotographic image formation, developer for electrophotographic image formation, electrophotographic image forming method, electrophotographic image forming apparatus, and process cartridge7 Jul 2026US 12,675,063 B2Ricoh Company, Ltd.
- Electrostatic charge image developer, developer cartridge, process cartridge, image forming apparatus, and image forming method23 Jun 2026US 12,663,735 B2FUJIFILM Business Innovation Corp.
- Ferrite particle, carrier core material for electrophotographic developer, carrier for electrophotographic developer, and electrophotographic developer28 Oct 2025US 12,455,516 B2Powdertech Co., Ltd.
- Positively chargeable toner and two-component developer containing positively chargeable toner8 Oct 2026US 2026/0310111 A1KYOCERA Document Solutions Inc.
- Two-component developer, developer set, developing device, and image forming apparatus24 Sep 2026US 2026/0288027 A1KYOCERA Document Solutions Inc.
- Toner, method for producing toner, two-component developer containing toner, and image forming device using toner24 Sep 2026US 2026/0288029 A1Sharp Kabushiki Kaisha
- Image forming apparatus24 Sep 2026US 2026/0288036 A1KYOCERA Document Solutions Inc.
- Toner, developing agent, toner accommodating unit, image forming apparatus, image forming method, method of producing printed material, and method of manufacturing toner25 Jun 2026US 2026/0177939 A1Etria Co., Ltd.
Most cited
By later US patents
- Two-component, dry electrographic developer compositions containing hard magnetic carrier particles and method for using the same138US 4,546,060 AEastman Kodak Company · 1985
- Two-component developer, container filled with the two-component developer, and image formation apparatus80US 6,468,706 B2Ricoh Company, Ltd. · 2002
- Magnetic carrier, two-component developer and image forming method61US 8,137,886 B2Canon Kabushiki Kaisha · 2012
- Production method of magnetic carrier and magnetic carrier produced therewith61US 8,323,726 B2Canon Kabushiki Kaisha · 2012
- Magnetic carrier and two component developer59US 7,927,775 B2Canon Kabushiki Kaisha · 2011