Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5225381 | Vacuum switch contact material and method of manufacturing it | Mitsuhiro Okumura | 1993-07-06 |
| 5130068 | Method of manufacturing vacuum switch contact material from Cr.sub.2 O.sub.3 powder | Mitsuhiro Okumura | 1992-07-14 |
| 5019156 | Sintered electric contact material for vacuum switch tube and process for manufacturing the same | Mitsuhiro Okumura | 1991-05-28 |
| 4971866 | Vacuum switch contact materials and the manufacturing methods | Mitsuhiro Okumura | 1990-11-20 |
| 4927989 | Contact material for vacuum circuit breaker | Mitsuhiro Okumura, Seiichi Miyamoto | 1990-05-22 |
| 4926017 | Vacuum breaker | Shinichi Aoki | 1990-05-15 |
| 4870231 | Contact for vacuum interrupter | Mitsuhiro Okumura | 1989-09-26 |
| 4827289 | Thermal head | Shiro Tsuji, Takashi Yamanaka, Yoshihiro Usui, Hiroshi Ito, Noriyuki Hasebe | 1989-05-02 |
| 4784829 | Contact material for vacuum circuit breaker | Mitsuhiro Okumura | 1988-11-15 |
| 4677264 | Contact material for vacuum circuit breaker | Mitsuhiro Okumura, Mitsuhiro Harima, Shoji Murakami, Seiichi Miyamoto | 1987-06-30 |
| 4626282 | Contact material for vacuum circuit breaker | Mitsuhiro Okumura | 1986-12-02 |
| 4575451 | Contact material for vacuum circuit breaker | Mitsuhiro Okumura | 1986-03-11 |
| 4540861 | Contact material for vacuum circuit interrupter | Mitsuhiro Okumura, Mitsumasa Yorita, Yasushi Takeya | 1985-09-10 |
| 4537743 | Electrode composition for vacuum switch | Takashi Yamanaka, Yasushi Takeya, Mitsumasa Yorita, Toshiaki Horiuchi, Kouichi Inagaki +2 more | 1985-08-27 |
| 4517033 | Contact material for vacuum circuit breaker | Mitsuhiro Okumura, Michinosuke Demizu | 1985-05-14 |
| 4499009 | Electrode composition for vacuum switch | Takashi Yamanaka, Yasushi Takeya, Mitsumasa Yorita, Toshiaki Horiuchi, Kouichi Inagaki +2 more | 1985-02-12 |
| 4486631 | Contact for vacuum circuit breaker | Toshiaki Horiuchi, Yasushi Takeya, Kouichi Inagaki, Michinosuke Demizu, Mitsuhiro Okumura | 1984-12-04 |
| 4424429 | Contactor for vacuum type circuit interrupter | Takashi Yamanaka, Kouichi Inagaki, Michinosuke Demizu, Mitsuhiro Okumura | 1984-01-03 |