Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880820 | Guanine derivatives | Wallace T. Ashton, Laura F. Canning, Richard L. Tolman | 1989-11-14 |
| 4816447 | Anti-viral guanine compounds | Wallace T. Ashton, John D. Karkas, Richard L. Tolman | 1989-03-28 |