Paul Tschopp
15Patents
5h-index
9Co-inventors
55Inventor score
Filing activity: Oct 23, 1973 → Dec 3, 1986
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4118232A | Photographic material containing sulphonic acid group containing disazo dyestuffs | Physics | 25 | Expired |
| US4051123A | Sulfonic-acid-group containing disazo dyestuffs | Physics | 18 | Expired |
| US4268591A | Material for color photography | Chemistry; Metallurgy | 14 | Expired |
| US4026709A | Color photographic recording material | Physics | 11 | Expired |
| US4661440A | Process for stabilizing photographic material containing magenta coupler | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4661437A | Photographic material with heterocylic azo dye for the silver dye bleach process | Physics | 5 | Expired |
| US4115121A | Silver halide color photographic material containing yellow coupler | Physics | 4 | Expired |
| US3984432A | Color photographic recording material | Chemistry; Metallurgy | 4 | Expired |
| US3931142A | Heterocyclic containing disazo compounds | Chemistry; Metallurgy | 2 | Expired |
| US4732997A | Dibenzoxaphosphorin compounds | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4268592A | Material for color photography | Physics | 2 | Expired |
| US4743683A | Imidazole azo dyes | Physics | 1 | Expired |
| US4324898A | Heterocyclic compounds useful as color photographic material | Chemistry; Metallurgy | 0 | Expired |
| US4206278A | Color photographic material | Chemistry; Metallurgy | 0 | Expired |
| US4229577A | Yellow photographic color couplers containing 3-imino-1,3,4-thiadiazolyl-4 groups | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.