Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12421132 | Sodium ferrite particle powder and production method thereof | Muneyoshi Sakamoto, Nobuya Shimo | 2025-09-23 |
| 9952524 | Magnetic carrier for electrophotographic developer and process for producing the same, and two-component system developer | Kaori Kinoshita | 2018-04-24 |
| 9921510 | Magnetic carrier for electrophotographic developer and process for producing the same, and two-component system developer | Katsuji Iwami, Shigenori Harada, Kaori Kinoshita | 2018-03-20 |
| 9778586 | Core material of magnetic carrier for electrophotographic developer and process for producing the same, magnetic carrier for electrophotographic developer, and two-component system developer | Kaori Kinoshita | 2017-10-03 |
| 9606467 | Magnetic carrier for electrophotographic developer and process for producing the same, and two-component system developer | Katsuji Iwami, Shigenori Harada, Kaori Kinoshita | 2017-03-28 |
| 9448500 | Magnetic iron oxide particles, magnetic carrier for electrophotographic developers and process for producing the same, and two-component system developer | Shigenori Harada, Shinji Uemoto, Hiromitsu Misawa, Koso Aoki | 2016-09-20 |
| 9285698 | Black magnetic iron oxide particles, magnetic carrier for electrophotographic developer and two-component developer | Shinji Uemoto, Hiromitsu Misawa, Ryo Iwai, Naoki Uchida, Koso Aoki +3 more | 2016-03-15 |
| 8852840 | Magnetic composite particles, magnetic carrier and developer | Muneyoshi Sakamoto, Hiromitsu Misawa | 2014-10-07 |
| 8673529 | Magnetic carrier for electrophotographic developer and process for producing the same, and two-component system developer | Kaori Kinoshita, Shinji Uemoto | 2014-03-18 |
| 5688852 | Iron oxide particles and process for producing the same | Hiromitsu Misawa, Kazuo Fujioka, Koso Aoki, Yoji Okano, Minoru Kozawa | 1997-11-18 |
| 5688998 | Surface reforming agent, surface reforming method and cone-type calix 4! r e | Kunihiro Ichimura, Masahide Ueda | 1997-11-18 |
| 5648170 | Coated granular magnetite particles and process for producing the same | Yoji Okano, Kazuo Fujioka, Koso Aoki, Hiromitsu Misawa, Minoru Kozawa | 1997-07-15 |
| 5512405 | Iron oxide particles and process for producing the same | Hiromitsu Misawa, Kazuo Fujioka, Koso Aoki, Yoji Okano, Minoru Kozawa | 1996-04-30 |
| 5470660 | Iron oxide particles and process for producing the same | Hiromitsu Misawa, Kazuo Fujioka, Koso Aoki, Yoji Okano, Minoru Kozawa | 1995-11-28 |
| 5389482 | Magnetic particle powder included in magnetic toners for magnetic image character recognition | Yoji Okano, Kazuo Fujioka, Koso Aoki, Hiromitsu Misawa, Yasuhiko Fujii | 1995-02-14 |
| 5336421 | Spinel-type spherical, black iron oxide particles and process for the producing the same | Haruki Kurokawa, Kazuo Fujioka | 1994-08-09 |
| 5328793 | Magnetic particles for magnetic toner | Hiromitsu Misawa, Kazuo Fujioka, Yasuhiko Fujii, Yoji Okano | 1994-07-12 |
| 5232805 | Magnetic particles containing iron as the main component and process for producing the same | Hiromitsu Misawa, Kazuo Fujioka, Yasuhiko Fujii, Youzi Okano | 1993-08-03 |
| 5108862 | Composite carrier particles for electrophotography and process for producing the same | Souichiro Kishimoto, Tsutomu Sakaida, Yoshiaki Echigo, Keiichi Asami, Tetsuro Toda +3 more | 1992-04-28 |