Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5251804 | Method for the continuous manufacture of metal-plated steel tubes by molten plating treatment | — | 1993-10-12 |
| 4624489 | Pipe connection method and connecting structure | — | 1986-11-25 |
| 4541659 | Permanently sealed threadless joint | — | 1985-09-17 |
| 4314125 | Electric seam welding device in the production equipment of hot-dip metal-coated steel tubes | — | 1982-02-02 |