Ortwin Schaffer
19Patents
6h-index
42Co-inventors
62Inventor score
Filing activity: Jun 19, 1980 → Mar 27, 1997
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5124181A | Copolymers based on long-chain unsaturated esters and ethylenically unsaturated carboxylic acids for making leather and furs water repellent | Chemistry; Metallurgy | 25 | Expired |
| US5279613A | Copolymers based on long-chain olefins and ethylenically unsaturated dicarboxylic anhydrides for rendering leathers and skins water-repellent | Chemistry; Metallurgy | 11 | Expired |
| US5342916A | Condensation polymers of sulfonated phenols, urea, other organic nitrogen-bases, and formaldehyde, and their use as tanning agents and as spraying aids for redispersible polymer powders | Chemistry; Metallurgy | 10 | Expired |
| US4351640A | Dye powder formulation | Chemistry; Metallurgy | 8 | Expired |
| US5286263A | Use of copolymers based on long-chain alkyl vinyl ethers and ethylenically unsaturated dicarboxylic anhydrides for rendering leathers and skins water-repellent | Chemistry; Metallurgy | 7 | Expired |
| US5789557A | Reactive azo dyes with a coupler of the aminonaphthalene series | Chemistry; Metallurgy | 7 | Expired |
| US5104979A | Polyazo dyes with diazo components of the aminophenol and the amino diphenyl-sulfide, -sulfoxide or -sulfone series | Chemistry; Metallurgy | 6 | Expired |
| US4888412A | Tanning assistant | Chemistry; Metallurgy | 5 | Expired |
| US4983185A | Dyeing of leather with pigments | Textiles; Paper | 5 | Expired |
| US5510468A | Amino benzophenone dye | Chemistry; Metallurgy | 4 | Expired |
| US4936864A | Condensates of bis-(4-hydroxyphenyl) sulfone as tanning assistants, their preparation and use in the tanning of leather | Chemistry; Metallurgy | 3 | Expired |
| US5155164A | Products of the condensation of phenolmonosulfonic acids, dihydroxydiphenyl sulfones, urea and formaldehyde | Chemistry; Metallurgy | 3 | Expired |
| US5320647A | Fluent polyazo dye preparations and method of dying leather or wool therewith | Emerging Cross-Sectional Technologies | 3 | Expired |
| US5224963A | Quaternized condensation products for aftertreating dyed leather | Textiles; Paper | 2 | Expired |
| US4801693A | Substituted sulfobenzene and triazine-containing reactive dyes | Chemistry; Metallurgy | 2 | Expired |
| US5380859A | Pyridone compounds and the preparation of disulfonated pyridone compounds | Chemistry; Metallurgy | 1 | Expired |
| US5372609A | Self-tanning, pretanning and assist tanning of pelts and skin pelts and retanning of leather and skin | Chemistry; Metallurgy | 1 | Expired |
| US4677199A | Reactive dyes containing substituted 4-fluoropyridaz-6-one radicals | Chemistry; Metallurgy | 1 | Expired |
| US4729768A | Deliming of hides and use of cyclic esters of sulfurous acid as deliming agents | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.