Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4407681 | High tensile steel and process for producing the same | Katutoshi Ina, Kazuo Yamamoto, Norio Ishikawa, Hiroshi Miyoshi | 1983-10-04 |
| 4318294 | Method of manufacturing seamless metal pipes and tubes | Seishiro Yoshiwara | 1982-03-09 |
| 4289011 | Continuous pipe rolling process | Seishiro Yoshiwara | 1981-09-15 |