Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5602652 | Portable device settable in a host apparatus and combined system therefor | Masumi Ishiwatari | 1997-02-11 |
| 5283820 | System utilizing portable device | Masumi Ishiwatari | 1994-02-01 |
| 5239386 | Communication apparatus used with a card-like device | Masumi Ishiwatari | 1993-08-24 |
| 4641258 | Electronic computer with aural output | — | 1987-02-03 |
| 4479134 | Electronic device having a thermal ink jet recorder | — | 1984-10-23 |
| 4455937 | Printing device | Minoru Murata | 1984-06-26 |
| 4366545 | Recording type electronic apparatus | — | 1982-12-28 |
| 4353079 | Electronic device having a variable density thermal ink jet recorder | — | 1982-10-05 |