Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869984 | Electrophotographic elements containing certain naphthoquinone derivatives as electron-transport agents | William B. Vreeland, Ralph H. Young | 1989-09-26 |
| 4869985 | Electrophotographic elements containing certain naphthoquinone derivatives as electron-transport agents | William B. Vreeland, Ralph H. Young | 1989-09-26 |