Tatsuo Heki
23Patents
8h-index
20Co-inventors
75Inventor score
Filing activity: Jun 22, 1982 → Dec 10, 2002
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4933265A | Process for forming direct positive color image | Physics | 52 | Expired |
| US4801520A | Direct positive color light-sensitive material comprising a DIR coupler and a pyrazoloazole coupler, and a process for forming a direct positive image | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4789627A | Method for forming direct positive color images | Physics | 12 | Expired |
| US4816290A | Process of forming solid granular film | Physics | 11 | Expired |
| US4469784A | Silver halide emulsions | Physics | 9 | Expired |
| US4863845A | Internal latent image type direct positive silver halide emulsions and process for producing the same | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4880729A | Method for forming direct positive image comprising developing with a combination of a nucleating agent and a hydrazine derivative | Physics | 8 | Expired |
| US4914009A | Process for forming direct positive color image comprising the use of bleach accelerators | Physics | 8 | Expired |
| US4871653A | Process for forming direct-positive image | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4863839A | Direct positive color image forming process | Physics | 6 | Expired |
| US4835091A | Process for forming a direct positive image | Physics | 5 | Expired |
| US4859579A | Silver halide photographic material | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4948712A | Direct positive photographic materials and a method of forming direct positive images | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4956267A | Method for forming a direct positive color image | Physics | 4 | Expired |
| US4397943A | Silver halide photographic light-sensitive material | Emerging Cross-Sectional Technologies | 3 | Expired |
| US5009993A | Direct positive photographic material | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4877723A | Silver halide photographic material comprising a specified nucleating agent | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4970140A | Direct positive photographic light-sensitive material | Physics | 3 | Expired |
| US4880727A | Direct positive photographic material | Emerging Cross-Sectional Technologies | 2 | Expired |
| US6936403B2 | Recording medium | Emerging Cross-Sectional Technologies | 1 | Expired |
| US4954427A | Process for the formation of direct positive images | Emerging Cross-Sectional Technologies | 1 | Expired |
| US5364750A | Direct positive silver halide photosensitive material | Physics | 1 | Expired |
| US4857445A | Direct positive photo-sensitive materials | Physics | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.