Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853297 | Multilayer coated corrosion resistant metal pipe | Masashi Kajiyama | 1989-08-01 |
| 4795503 | Seam welded steel pipe proofed against corrosion and provided with coating for preventing fluid from oxidation and method for production thereof | Toshihiko Mizuhashi | 1989-01-03 |