Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885887 | Apparatus and method for securing an outer roofing membrane to an insulated roof deck | Robert W. Simmons, Thomas P. Kaufman | 1989-12-12 |
| 4827686 | Coated roofing membrane | Robert C. Hultz | 1989-05-09 |