Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6151471 | Toner supplying device, method and image forming apparatus using the same toner supplying device or method | Masasumi Yahata, Shunji Katoh | 2000-11-21 |
| 6097903 | Toner supplying device, toner container therefor and image forming apparatus using same toner supplying device and toner container | Masasumi Yahata, Shunji Katoh | 2000-08-01 |
| 6091912 | Tower supplying device and image forming apparatus using same toner supplying device | Shunji Katoh, Masasumi Yahata | 2000-07-18 |
| 5950055 | Powder pump and image forming apparatus having the powder pump and method therefor | Masazumi Yahata, Shunji Katoh, Masakuni Konja, Satoshi Takano, Fumihito Itoh | 1999-09-07 |