Helmut Hoch
26Patents
5h-index
20Co-inventors
69Inventor score
Filing activity: Jun 5, 1974 → Oct 21, 1994
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4113498A | Corrosion inhibitor for metal surfaces | Chemistry; Metallurgy | 21 | Expired |
| US4189582A | Process for upgrading the color value of 3,4,9,10-tetracarboxylic acid N,N'-bis-methylimide | Chemistry; Metallurgy | 9 | Expired |
| US4067903A | Manufacture of arylamines | Chemistry; Metallurgy | 8 | Expired |
| US4286094A | Preparation of a pigmentary form of perylene-3,4,9,10-tetracarboxylic acid diimide | Chemistry; Metallurgy | 6 | Expired |
| US4979684A | Dispersion, comminution or deagglomeration and classification of solids | Performing Operations; Transporting | 6 | Expired |
| US5342950A | Preparation of quinophthalone derivatives | Chemistry; Metallurgy | 4 | Expired |
| US4020102A | Production of 2-hydroxynaphthalene-3-carboxylic acid | Chemistry; Metallurgy | 4 | Expired |
| US4002664A | Manufacture of dimethylaminobenzenecarboxylic acid esters | Performing Operations; Transporting | 3 | Expired |
| US4032568A | Production of 2-hydroxynaphthalene-3-carboxylic acid | Chemistry; Metallurgy | 2 | Expired |
| US4038309A | Production of 2-hydroxynaphthalene-3-carboxylic acid | Chemistry; Metallurgy | 2 | Expired |
| US4217455A | Preparation of transparent and easily dispersible perylene-3,4,9,10-tetracarboxylic acid diimide pigments of high tinctorial strength | Chemistry; Metallurgy | 2 | Expired |
| US4167634A | Manufacture of a pigmentary form of .alpha.-indanthrone | Chemistry; Metallurgy | 2 | Expired |
| US4332955A | Preparation of transparent pigmentary forms of 4,4',7,7'-tetrachlorothioindigo | Chemistry; Metallurgy | 2 | Expired |
| US4950756A | Preparation of 1-nitroanthraquinone-2-carboxylic acid | Chemistry; Metallurgy | 1 | Expired |
| US5066820A | Process for the preparation of 1-amino-2-carboxyanthraquinones | Chemistry; Metallurgy | 1 | Expired |
| US4298534A | Preparation of brilliant, transparent pigmentary bromo-isoviolanthrone of high tinctorial strength | Chemistry; Metallurgy | 1 | Expired |
| US5210190A | Preparation of triazinyl-bis-anthraquinone dyes by reacting aryldihalotriazine with amino anthraquinone | Chemistry; Metallurgy | 1 | Expired |
| US4824608A | Preparation of C.I. Vat Blue 16 | Chemistry; Metallurgy | 0 | Expired |
| US4916244A | Preparation of 1-amino-4-hydroxy-2-(6'-hydroxyhexoxy)-anthraquinone | Chemistry; Metallurgy | 0 | Expired |
| US4002675A | Manufacture of 2-hydroxy-naphthalene-3-carboxylic acid | Chemistry; Metallurgy | 0 | Expired |
| US4882095A | Preparation of alkoxy(iso)violanthrenediones | Chemistry; Metallurgy | 0 | Expired |
| US4323510A | Brown vat dye and its preparation | Chemistry; Metallurgy | 0 | Expired |
| US4133828A | Manufacture of dimethylaminobenzenesulfonates | Chemistry; Metallurgy | 0 | Expired |
| US5525743A | Preparation of anthraquinone imide compounds | Chemistry; Metallurgy | 0 | Expired |
| US4431824A | Preparation of 4,4',7,7'-tetrachlorothioindigo pigments of high color strength | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.