Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4490151 | Disazo sulfophenylpyrazolonestilbene dyes and direct dyes to color cellulose black | — | 1984-12-25 | |
| 4455258 | Disazo sulfophenylpyrazolone-sulfostilbene dyes | — | 1984-06-19 | $433,000 |
| 4285861 | Sulfonated naptho[1,2]triazole azo barbituric acid derivatives | Howard Smith | 1981-08-25 | $165,000 |
| 4255327 | Direct black dye | — | 1981-03-10 | $386,000 |