William S. Derwin
14Patents
4h-index
23Co-inventors
56Inventor score
Filing activity: Nov 16, 1982 → Feb 15, 2000
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6118018A | Chlorination and bromination of aromatic compounds at atmospheric pressure | Chemistry; Metallurgy | 27 | Expired |
| US6303812A | Isolation of products from selective dehalogenation of haloaromatics | Chemistry; Metallurgy | 5 | Expired |
| US4935541A | Preparation of 2,4,5-trifluorobenzoic acid by decarboxylation of 3,4,6-trifluorophthalic anhydride | Chemistry; Metallurgy | 5 | Expired |
| US5233082A | Method of making 3-hydroxy-2,4,5-trifluorobenzoic acid | Chemistry; Metallurgy | 4 | Expired |
| US4981999A | Selective removal of chlorine from chlorophthalic compounds | Chemistry; Metallurgy | 3 | Expired |
| US5380926A | Method of making 3-methoxy-2,4,5-trifluorobenzoic acid | Chemistry; Metallurgy | 3 | Expired |
| US5596104A | Preparation of 3,4,6-trifluorophthalic acid | Chemistry; Metallurgy | 2 | Expired |
| US5233085A | Preparation of 2,4,5-trifluorobenzoic acid by decarboxylation of 3,4,6-trifluorophthalic acid | Chemistry; Metallurgy | 2 | Expired |
| US6118028A | Method of making trifluoromethoxybenzenes | Chemistry; Metallurgy | 1 | Expired |
| US5773668A | Method of making trichloromethoxybenzene | Chemistry; Metallurgy | 1 | Expired |
| US5294738A | Process for selective hydrodefluorination | Chemistry; Metallurgy | 1 | Expired |
| US6117278A | Method of making .alpha.-chloroxylenes | Chemistry; Metallurgy | 0 | Expired |
| US6201152A | Method of making 3,5-dichloro-p-toluoyl chloride | Chemistry; Metallurgy | 0 | Expired |
| US6284934A | Reducing meta content of isomeric mixtures of halo substituted alkylbenzenes | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.