Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828761 | Process for impregnating a concrete or cement body with a polymeric material | Roger D. Spence | 1989-05-09 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828761 | Process for impregnating a concrete or cement body with a polymeric material | Roger D. Spence | 1989-05-09 |