Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4277533 | Waterproofing sheet material | Charles A. Kumins | 1981-07-07 |
| 4272582 | Waterproofing sheet material | Charles A. Kumins | 1981-06-09 |
| 4265967 | Waterproofing sheet material | Charles A. Kumins | 1981-05-05 |
| 4264674 | Waterproofing sheet material | Charles A. Kumins | 1981-04-28 |
| 4235953 | Waterproofing sheet material | Charles A. Kumins | 1980-11-25 |