Winfried Orth
25Patents
3h-index
19Co-inventors
60Inventor score
Filing activity: Nov 27, 1972 → Aug 23, 1993
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4567272A | Pyrrole containing 2-aminonitropyridine derivatives | Chemistry; Metallurgy | 18 | Expired |
| US4659846A | Preparation of 2,5-diloweralkyl-1.4:3,6-dianhydrosorbitols | Chemistry; Metallurgy | 12 | Expired |
| US4377699A | 5-Chloro-indole preparation | Chemistry; Metallurgy | 3 | Expired |
| US5169990A | Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene | Chemistry; Metallurgy | 3 | Expired |
| US4529800A | Novel process for the preparation of 2-halo-3-nitro-6-alkoxy-pyridines | Chemistry; Metallurgy | 3 | Expired |
| US5149886A | Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene | Chemistry; Metallurgy | 3 | Expired |
| US3954891A | Method of making substituted hydroquinones | Chemistry; Metallurgy | 2 | Expired |
| US4549024A | Oxidation of quinoline to quinolinic acid | Chemistry; Metallurgy | 2 | Expired |
| US4582910A | Method for preparation of 4-halogenonaphthalic acid anhydrides | Chemistry; Metallurgy | 2 | Expired |
| US4942239A | Process for the production of 2-hydroxypyridine | Chemistry; Metallurgy | 2 | Expired |
| US5082944A | Production of pyridine-3-sulfonic acid | Chemistry; Metallurgy | 1 | Expired |
| US4719298A | Side chain chlorination process of heterocycles | Chemistry; Metallurgy | 1 | Expired |
| US4510090A | Method for the production of phenanthrenequinone | Chemistry; Metallurgy | 1 | Expired |
| US4925942A | Preparation of quinuclidine-3-methanol | Chemistry; Metallurgy | 1 | Expired |
| US4546190A | Method for producing 3,5,6-trichloro-1H-pyridine-2-on | Chemistry; Metallurgy | 0 | Expired |
| US4228083A | Process for the production of .beta.-(5-nitro-2-furyl)-acrolein | Chemistry; Metallurgy | 0 | Expired |
| US4785110A | Process for the production of 2-amino-3-nitro-6-(4-fluorobenzylamino)-pyridine | Emerging Cross-Sectional Technologies | 0 | Expired |
| US4256892A | Preparation of bis-2-pyridyl-disulfides | Chemistry; Metallurgy | 0 | Expired |
| US5380862A | Preparation of isomer-free 2,5-dichloro-pyridine | Chemistry; Metallurgy | 0 | Expired |
| US4564700A | Process for the preparation of fluorene-9-carboxylic acid | Chemistry; Metallurgy | 0 | Expired |
| US4357277A | Novel process for the preparation of N,N'-bisacyl hydrazides | Human Necessities | 0 | Expired |
| US4493935A | Preparation of 1H-pyrrol-2-acetic acid esters | Chemistry; Metallurgy | 0 | Expired |
| US5066806A | Novel separation process | Chemistry; Metallurgy | 0 | Expired |
| US4865620A | Hair dye composition | Human Necessities | 0 | Expired |
| US4332728A | Process for the preparation of bisacyl hydrazines | Human Necessities | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.