Erwin Ranz
28Patents
7h-index
32Co-inventors
65Inventor score
Filing activity: Nov 20, 1972 → Jun 15, 1987
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4119464A | Process for hardening photographic layers containing gelatine | Physics | 15 | Expired |
| US4365012A | Light sensitive recording material | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4267264A | Color photographic recording material | Physics | 12 | Expired |
| US4348474A | Light sensitive photographic recording material and the use thereof for the production of photographic images | Physics | 11 | Expired |
| US4052213A | Light-sensitive photographic material | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4186011A | Color photographic recording material | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4770980A | Multilayer color photographic recording material wherein a red secondary sensitivity is produced in the blue and green layers | Physics | 9 | Expired |
| US4003748A | Incorporation process | Physics | 7 | Expired |
| US4369248A | Photographic recording material and its use for the production of images | Physics | 7 | Expired |
| US4043818A | Process for hardening photographic layers with carbodiimide compounds containing sulphobetaine groups | Physics | 6 | Expired |
| US4183752A | Light-sensitive photographic material | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4036646A | Color correction of unwanted side densities in light-sensitive color photographic elements | Physics | 5 | Expired |
| US4088491A | Light sensitive photographic material | Physics | 5 | Expired |
| US3941595A | Photographic material containing fogged, direct positive silver halide emulsion and negative silver halide emulsion for the production of equidensities | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4046574A | Color photographic material with homophthalimide thioether development inhibitor | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4315070A | Color-photographic recording material containing a highly reactive dir-coupler | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4418142A | Light-sensitive photographic silver halide recording material | Physics | 4 | Expired |
| US4023970A | Light-sensitive color photographic material with masking layer comprising spontaneously silver halide | Physics | 4 | Expired |
| US4250252A | Light-sensitive color photographic material | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4173479A | Color photographic recording material | Physics | 4 | Expired |
| US4571378A | Color photographic recording material and development process | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4368259A | Color photographic recording material containing an emulsified, hydrophilic color-forming compound | Physics | 3 | Expired |
| US4171223A | Light-sensitive color photographic material | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4186012A | Light sensitive color photographic material containing development inhibitor releasing coupler | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4106940A | Light-sensitive material containing emulsified substances | Physics | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.