Wolfgang Ruff
7Patents
4h-index
8Co-inventors
46Inventor score
Filing activity: Jan 21, 1976 → Oct 23, 1989
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4720304A | Pigment formulations | Chemistry; Metallurgy | 12 | Expired |
| US4894094A | Disazo compounds and formulations containing same | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4222788A | Mixed pigment and process of preparing the same | Chemistry; Metallurgy | 4 | Expired |
| US4602960A | Modified diarylide pigments and their preparation | Chemistry; Metallurgy | 4 | Expired |
| US4981489A | Disazo compounds and formulations containing same | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4247296A | Diazo pigments | Chemistry; Metallurgy | 2 | Expired |
| US4052378A | Red pigment obtained by coupling diazotized 4-aminonaphthalimide with 2,6-dihydroxy-3-cyano-4-methylpyridine | Chemistry; Metallurgy | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.