Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4711462 | Injection ski and a method of manufacturing same | Keijiro Hayashi | 1987-12-08 |
| 4697821 | Ski | Keijiro Hayashi, Kenzo Shinya, Shigeru Asai | 1987-10-06 |
| 4590023 | Method for manufacturing an injection-molded foam core ski plate | Keijiro Hayashi, Shigeru Asai | 1986-05-20 |
| 4451041 | Golf club head and a method for manufacturing the same | Keijiro Hayashi, Masayuki Yoshikawa, Kouzou Yazawa, Takashi Ito | 1984-05-29 |
| 4451042 | Golf club head of carbon fiber reinforced plastic | Keijiro Hayashi, Masayuki Yoshikawa, Kouzou Yazawa, Takashi Ito | 1984-05-29 |
| 4449707 | Golf club head of carbon fiber reinforced plastic | Keijiro Hayashi, Masayuki Yoshikawa, Kouzou Yazawa, Takashi Ito | 1984-05-22 |