Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4429558 | Method of and apparatus for fabrication of spiral fin | Hiroya Murakami, Mitsuhiro Takasaki, Osamu Yamada, Katsuyoshi Hori | 1984-02-07 |
| 4331280 | Method of jointing pipes by friction welding | Takao Terabayashi, Kenichi Waragai, Masaru Kobayashi, Izumi Ochiai, Yoiti Wakabayashi | 1982-05-25 |
| 4239944 | Spider of loudspeaker | Isao Obara, Aizo Kaneda | 1980-12-16 |