Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4824880 | Asphalt adhesives | Donald J. Algrim, William E. Uffner, Glenn D. Lamb | 1989-04-25 |
| 4817358 | Asphalt shingle with foamed asphalt layer under tabs | William W. Lincoln | 1989-04-04 |