Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877699 | Electrophotographic luminescent amplification process | John W. May | 1989-10-31 |
| 4869984 | Electrophotographic elements containing certain naphthoquinone derivatives as electron-transport agents | Teh-Ming Kung, William B. Vreeland | 1989-09-26 |
| 4869985 | Electrophotographic elements containing certain naphthoquinone derivatives as electron-transport agents | Teh-Ming Kung, William B. Vreeland | 1989-09-26 |