Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878950 | Bitumen composition | Andrew Halasz, David H. Doolittle | 1989-11-07 |
| 4848057 | Roofing shingles | Peter G. MacDonald, Jayant B. Kandalgaonkar | 1989-07-18 |
| D282287 | Shingle | David J. McKeagan | 1986-01-21 |
| D277411 | Shingle | Peter G. MacDonald | 1985-01-29 |