Patents per Year
Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5173390 | Water soluble contrast enhancement composition and method of use | John B. Covington, Vic B. Marriott, Larry G. Venable | 1992-12-22 | $3,532,000 |
| 4997742 | Water soluble contrast enhancement composition with 1-oxy-2 diazonaphthalene sulfonamide salt and polyvinyl alcohol | John B. Covington, Vic B. Marriott, Larry G. Venable | 1991-03-05 | $5,116,000 |
| 4816380 | Water soluble contrast enhancement layer method of forming resist image on semiconductor chip | John B. Covington, Vic B. Marriott, Larry G. Venable | 1989-03-28 | $2,218,000 |