Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849504 | Polymers with vinylic units and aromatic units | Denis G. H. Ballard, Andrew Courtis | 1989-07-18 |
| 4798742 | Polyaromatics | Denis G. H. Ballard, Paul A. Holmes, Alan Nevin, David L. Twose | 1989-01-17 |