Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4802894 | Method of using a structural member of anti-sulfur-attack cr-ni-al-si alloy steel for coal gasification system | Kenichi Usami, Seishin Kirihara, Hiroyuki Doi, Michiya Okada | 1989-02-07 |