Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4751164 | Method of making carrier for use in electrophotographic developers | Mitsuhiro Katayama, Kenkichi Hara, Kazuyoshi Oka, Ulf Engstrom | 1988-06-14 |
| 4663262 | Carrier for use in electrophotographic developers | Kazuyoshi Oka, Mitsuhiro Katayama, Toshihiko Kohno, Ulf Engstrom | 1987-05-05 |