Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869762 | Insulation of vessels having curved surfaces | Hiroshi Tonokowa, Emil Ekker | 1989-09-26 |
| 4823981 | Insulation of vessels having curved surfaces | Hiroshi Tonokowa, Emil Ekker | 1989-04-25 |