Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4341560 | Waterproof gypsum molded product | Eiichi Hirai, Masao Endo, Toru Nishino | 1982-07-27 |
| 4330589 | Foamed gypsum moulded articles and production thereof | Eiichi Hirai, Masao Endo, Toru Nishino | 1982-05-18 |