Hellmut Kast
13Patents
3h-index
15Co-inventors
57Inventor score
Filing activity: Jan 24, 1974 → Aug 14, 2001
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4147604A | Photopolymerizable binders containing diaminobenzophenones | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4223144A | Triphenylmethane dyes | Textiles; Paper | 11 | Expired |
| US4000135A | Manufacture of basic dyes by catalytic oxidation | Performing Operations; Transporting | 6 | Expired |
| US3931182A | Lactones of the diazaxanthene series, their production and their use as dye-forming components for copying methods | Performing Operations; Transporting | 3 | Expired |
| US4976744A | Preparation of concentrated solutions of cationic dyes as mono-carboxylates in glycol ether | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4052398A | Diazarhodamine-lactones, their manufacture and their use as dye intermediates for copying processes | Performing Operations; Transporting | 3 | Expired |
| US4176229A | Basic dyes | Chemistry; Metallurgy | 3 | Expired |
| US5073634A | Tetrachloroferrates of basic dyes | Textiles; Paper | 2 | Expired |
| US3946017A | Lactones of the benzaxanthere series and dye-forming components for use in duplication processes | Performing Operations; Transporting | 2 | Expired |
| US6846956B2 | Triarylmethane dyes | Emerging Cross-Sectional Technologies | 1 | Expired |
| US3997541A | Lactones of the benzazaxanthene series and dye-forming components for duplication processes | Chemistry; Metallurgy | 1 | Expired |
| US6160169A | Preparation of amine salts of 4-nitrotoluene-2-sulfonic acid | Chemistry; Metallurgy | 1 | Expired |
| US5892105A | Preparation of amine salts of 4-nitrotoluene-2-sulfonic acid | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.