Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4664774 | Low solids content, coal tar based impregnating pitch | Arthur Chu, George R. Cook, David M. Horbachewski | 1987-05-12 |
| 4537635 | Tar fraction for driveway sealers using oxidized coal tar distillate | Arthur Chu, George R. Cook | 1985-08-27 |