Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860340 | DTMF signal discriminating circuit | Yasuo Suzuki | 1989-08-22 |
| 4820746 | Radiation-cured rubber-based pressure-sensitive adhesive | Cassandra S. Rice, Sebastian S. Plamthottam | 1989-04-11 |