Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874866 | Photographically useful chalcogenazoles, chalcogenazolines, and chalcogenazolinium and chalcogenazolium salts | Wolfgang H. H. Gunther, Ronald E. Leone | 1989-10-17 |
| 4831136 | Oxatellurazolium and oxatellurazinium compounds | Wolfgang H. H. Gunther, Ronald E. Leone | 1989-05-16 |