Issued Patents All Time
Showing 51–53 of 53 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5305569 | Thick shingle | Alfred B. Malmquist | 1994-04-26 |
| D344144 | Laminated shingle | Casimir Paul Weaver, William J. Schultz | 1994-02-08 |
| 5232530 | Method of making a thick shingle | Alfred B. Malmquist | 1993-08-03 |