Wilfried Seyfert
7Patents
4h-index
21Co-inventors
53Inventor score
Filing activity: Nov 12, 1987 → May 11, 2004
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6433219B1 | Method for the production of methylenedi(phenylamine and methylenedi(phenyl isocyanate) | Chemistry; Metallurgy | 32 | Expired |
| US7230130B2 | Process for preparing methylenedianiline and methylenebis (phenylisocyanate) | Chemistry; Metallurgy | 15 | Expired |
| US6831192B2 | Process for preparing methylenedianiline and methylenebis(phenyl isocyanate) | Chemistry; Metallurgy | 11 | Expired |
| US4946029A | Purification of carboxylic esters which contain aldehydes, acetals and/or unsaturated compounds | Chemistry; Metallurgy | 6 | Expired |
| US6229043A | Preparation of mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates having a reduced iodine color number and a reduced chlorine content | Chemistry; Metallurgy | 3 | Expired |
| US5159107A | Continuous preparation of alkyl pentenoates | Chemistry; Metallurgy | 3 | Expired |
| US4810798A | Recovery of pyridine or methylpyridines or mixtures thereof from methyl butanedicarboxylate containing reaction mixtures | Chemistry; Metallurgy | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.