Issued Patents 1989
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887274 | Deterioration-resistant superlattice semiconductor laser device | Toshiro Hayakawa, Kosei Takahashi, Masafumi Kondo | 1989-12-12 |
| 4862470 | Semiconductor laser device | Kosei Takahashi, Masafumi Kondo, Toshiro Hayakawa | 1989-08-29 |
| 4860297 | Quantum well semiconductor laser device | Toshiro Hayakawa, Kohsei Takahashi, Masafumi Kondo, Saburo Yamamoto | 1989-08-22 |
| 4852111 | Semiconductor laser device | Toshiro Hayakawa, Kosei Takahashi, Masafumi Kondo | 1989-07-25 |
| 4845724 | Semiconductor laser device having optical guilding layers of unequal resistance | Toshiro Hayakawa, Kosei Takahashi, Masafumi Kondo | 1989-07-04 |
| 4841533 | Semiconductor laser device having a graded index waveguide | Toshiro Hayakawa, Masafumi Kondo, Kohsei Takahashi, Saburo Yamamoto | 1989-06-20 |
| 4835783 | Semiconductor laser | Toshiro Hayakawa, Kohsei Takahashi, Masafumi Kondo, Saburo Yamamoto | 1989-05-30 |
| 4824518 | Method for the production of semiconductor devices | Toshiro Hayakawa, Kohsei Takahashi, Saburo Yamamoto | 1989-04-25 |
| 4806994 | Semiconductor device | Toshiro Hayakawa, Kohsei Takahashi, Saburo Yamamoto | 1989-02-21 |
| 4807235 | Semiconductor laser device | Kohsei Takahashi, Saburo Yamamoto, Toshiro Hayakawa, Masafumi Kondo | 1989-02-21 |