Erich Fretschner
13Patents
4h-index
13Co-inventors
53Inventor score
Filing activity: Jun 7, 1990 → May 13, 2002
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4996327A | Preparation of pyrazole and its derivatives | Chemistry; Metallurgy | 7 | Expired |
| US5569769A | Preparation of pyrazole and its derivatives | Chemistry; Metallurgy | 6 | Expired |
| US5744614A | Preparation of 3,5-diarylpyrazoles | Chemistry; Metallurgy | 4 | Expired |
| US5128480A | Preparation of 3-methylpyrazole | Chemistry; Metallurgy | 4 | Expired |
| US5939584A | Process for preparing solid, free-flowing water-soluble salts of aryloxy-C.sub.1 -C.sub.4 -alkanecarboxylic acids | Human Necessities | 4 | Expired |
| US6229022A | Method for producing substituted pyrazoles | Chemistry; Metallurgy | 2 | Expired |
| US6515139B1 | Method for producing N-substituted 2-pyrazoline-5-one | Human Necessities | 1 | Expired |
| US5763659A | Preparation of optically active 2-halopropionic acids | Chemistry; Metallurgy | 0 | Expired |
| US7002023B2 | Method for producing 1 substituted 5-chloro-4 methly pyrazoles | Chemistry; Metallurgy | 0 | Expired |
| US6538135B1 | Method for producing 4-amino-5-chloro-1-phenyl pyridazinone-(6) | Chemistry; Metallurgy | 0 | Expired |
| US5840913A | Process for preparing N-substituted pyrazoles | Chemistry; Metallurgy | 0 | Expired |
| US5847154A | Method of preparing 1,2-dimethyl-3,5-diarylpyrazolium methylsulfates | Chemistry; Metallurgy | 0 | Expired |
| US6252069A | Method for the production of 3-isopropyl-1H-2, 1,3-benzothiadiazine-4 (3H)-one-2,2-dioxide | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.