Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889703 | Process for producing tungstosilicic acid | Alan D. Douglas, Henry E. Hoffman | 1989-12-26 |
| 4859361 | Process for producing electroluminescent phosphors of improved brightness | Richard G. W. Gingerich | 1989-08-22 |
| 4803062 | Method for producing tungsten hexachloride | Robin W. Munn, Robert P. McClintic | 1989-02-07 |