Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881950 | Silicon nitride cutting tool | Dhirajlal Shah | 1989-11-21 |
| 4830886 | Process for making cutting insert with titanium carbide coating | Toshiaki Cho, Krishnan Narasimhan | 1989-05-16 |