Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868083 | Developer carrier and process for producing the same | Ikutaroh Nagatsuka, Yasuo Matsumura, Masayuki Takeda, Takayoshi Aoki | 1989-09-19 |
| 4859558 | Composition with fatty acid bisamide powder developer | Yasuo Matsumura, Takayoshi Aoki, Masayuki Takeda, Ikutaroh Nagatsuka | 1989-08-22 |
| 4833703 | On-hook control circuit for answering machine | — | 1989-05-23 |