Hans Hellbach
7Patents
5h-index
14Co-inventors
52Inventor score
Filing activity: Oct 19, 1977 → Nov 14, 1985
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4596678A | Multiple-step process for the preparation of hexamethylene diisocyanate-1,6 and/or isomeric aliphatic diisocyanates with six carbon atoms in the alkylene residue | Chemistry; Metallurgy | 68 | Expired |
| US4596679A | Multiple-step process for the preparation of 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate | Chemistry; Metallurgy | 65 | Expired |
| US4482499A | Process for the preparation of isocyanates by thermal cleaving of urethanes | Chemistry; Metallurgy | 20 | Expired |
| US4613466A | Preparation of hexamethylene 1,6-diisocyanate and/or isomeric diisocyanates where alkylene is of 6 carbon atoms | Chemistry; Metallurgy | 12 | Expired |
| US4681946A | Preparation of nicotinamide | Chemistry; Metallurgy | 8 | Expired |
| US4138591A | Manufacture of alkylphenols | Chemistry; Metallurgy | 4 | Expired |
| US4491674A | Process and apparatus for the safe supply of molecular oxygen or of gas containing molecular oxygen to an oxidation of hydrocarbons | Chemistry; Metallurgy | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.