Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4830821 | Process of making a contact forming material for a vacuum valve | Tsutomu Okutomi, Seishi Chiba, Tadaaki Sekiguchi, Hiroshi Endo, Tsutomu Yamashita | 1989-05-16 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4830821 | Process of making a contact forming material for a vacuum valve | Tsutomu Okutomi, Seishi Chiba, Tadaaki Sekiguchi, Hiroshi Endo, Tsutomu Yamashita | 1989-05-16 |