Siegfried Schiessler
15Patents
6h-index
12Co-inventors
63Inventor score
Filing activity: Dec 21, 1973 → Jun 7, 1995
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5071482A | Pigment preparations | Chemistry; Metallurgy | 9 | Expired |
| US4018791A | Process for the preparation of highly pure halogenated phthalocyanine pigment | Chemistry; Metallurgy | 9 | Expired |
| US5071483A | Process for the preparation of pigment preparations of the anthanthrone series | Chemistry; Metallurgy | 9 | Expired |
| US3972987A | Process for regenerating sulfuric acid | Chemistry; Metallurgy | 9 | Expired |
| US4010240A | Process for the regeneration of sulfuric acid | Chemistry; Metallurgy | 7 | Expired |
| US4224222A | Process for preparing copper phthalocyanine pigments of the .alpha.-modification | Chemistry; Metallurgy | 7 | Expired |
| US4153602A | Process for the preparation of a N,N'-dimethyl-perylene-3,4,9,10-tetracarboxylic acid diimide pigment | Chemistry; Metallurgy | 6 | Expired |
| US5698705A | Isoindoline pigments | Chemistry; Metallurgy | 6 | Expired |
| US4056534A | Process for preparing copper phthalocyanine pigments of the .alpha.-modification | Chemistry; Metallurgy | 5 | Expired |
| US5329046A | Biscationic acid amide and imide derivatives and processes for their preparation | Chemistry; Metallurgy | 2 | Expired |
| US4599431A | Process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid and its 1,8-monoanhydride in a high degree of purity | Chemistry; Metallurgy | 2 | Expired |
| US5074919A | Preparation of vat dyes and pigments of the perinone series | Chemistry; Metallurgy | 1 | Expired |
| US4684753A | Process for preparing 1,3,6,8-tetrabromopyrene | Chemistry; Metallurgy | 1 | Expired |
| US4010180A | Process for the purification of copper phthalocyanine | Chemistry; Metallurgy | 1 | Expired |
| US4939193A | Use of the alpha-modification of cis-naphthoylenebis(benzimidazole) for pigmenting polyolefins | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.