Gerhard Wolfrum
50Patents
9h-index
34Co-inventors
78Inventor score
Filing activity: Nov 1, 1966 → Apr 16, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4132840A | Process for coloring polyurethane foams | Emerging Cross-Sectional Technologies | 34 | Expired |
| US4637979A | Composition and test device for determining the presence of leukocytes containing a zwitterion coupling agent | Emerging Cross-Sectional Technologies | 30 | Expired |
| US4396710A | Photographic recording material with metal complexable, heterocyclic azo dye | Physics | 20 | Expired |
| US4814271A | Method for detecting esterolytic and proteolytic enzymes | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4521506A | Monoazo pyridinol dyes chelated or capable of being chelated with metal ions and their use for image production | Physics | 15 | Expired |
| US4600681A | Color photographic material with azo dicyanoimidazole dyes | Chemistry; Metallurgy | 11 | Expired |
| US4180503A | Acid disazo dyestuffs containing a substituted thiophene middle component | Textiles; Paper | 11 | Expired |
| US4124581A | Disazo dyestuffs containing a thiazole central component | Chemistry; Metallurgy | 11 | Expired |
| US4038240A | Process for dyeing polyurethane resins | Chemistry; Metallurgy | 9 | Expired |
| US4119623A | Water-soluble diphenylamine-azo-sulfatoalkoxyphenyl dyestuffs | Chemistry; Metallurgy | 6 | Expired |
| US4524123A | Chelatable 4-thienyl imidazole azo dyes, their use in color photographic recording material | Chemistry; Metallurgy | 6 | Expired |
| US4711954A | 3-thienylazo dyes with a gamma-acid coupler | Chemistry; Metallurgy | 5 | Expired |
| US4218373A | Water-soluble phenylazoaminonaphthol sulphonic acid dyestuffs | Chemistry; Metallurgy | 5 | Expired |
| US4041024A | Sulfo containing monoazo dyestuffs containing a benzthiazole diazo moiety and an N-benzylamino anilino coupling component | Chemistry; Metallurgy | 4 | Expired |
| US3956267A | Indole-containing disazo dyestuffs having a sulfatoalkyleneoxy-substituent | Chemistry; Metallurgy | 4 | Expired |
| US4988616A | Method for detecting hydrogen peroxide employing triaryl- and trihetarylmethane derivatives as redox indicators | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4249275A | Process for dyeing and printing cellulose fibres | Chemistry; Metallurgy | 4 | Expired |
| US4418143A | Color photographic recording material | Physics | 4 | Expired |
| US4000123A | Aminosulfonylphenyl-azo-indolyl dyestuffs | Chemistry; Metallurgy | 4 | Expired |
| US4248774A | P-Sulphophenoxy-phenylazo indoles | Chemistry; Metallurgy | 3 | Expired |
| US4749813A | 4-alkyl-2-trifluoromethylanilines | Chemistry; Metallurgy | 3 | Expired |
| US3994873A | Azo dyestuffs containing sulfonylamino-sulfonyl groups | Textiles; Paper | 3 | Expired |
| US4461827A | Color photographic recording material containing a non-diffusible dye releaser from which a complexible azo dye is released during development | Physics | 3 | Expired |
| US4247460A | Disazo dyestuff sulphuric acid ester | Chemistry; Metallurgy | 3 | Expired |
| US4579817A | Color photographic recording material containing dye-releasers releasing 6-arylazo-2-amino-3-pyridinol dyes which are chelatable with metal ions | Chemistry; Metallurgy | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.