Tom Witzel
47Patents
11h-index
75Co-inventors
74Inventor score
Filing activity: Apr 14, 1989 → Dec 9, 1998
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5527946A | Preparation of aliphatic alpha, omega-aminonitriles | Chemistry; Metallurgy | 31 | Expired |
| US5489663A | Preparation of polyisocyanates containing isocyanurate groups and use thereof | Chemistry; Metallurgy | 26 | Expired |
| US5663444A | Preparation of a pure dialkylaminoethanol stable against discoloration | Chemistry; Metallurgy | 20 | Expired |
| US5696048A | Cobalt catalysts | Chemistry; Metallurgy | 17 | Expired |
| US6201160A | Preparation of alcohols | Chemistry; Metallurgy | 17 | Expired |
| US5646277A | Preparation of caoprolactam | Chemistry; Metallurgy | 16 | Expired |
| US5463130A | Preparation of peralkylated amines | Chemistry; Metallurgy | 14 | Expired |
| US5536691A | Cobalt catalysts and a process required for their preparation | Chemistry; Metallurgy | 14 | Expired |
| US6018074A | Process for the preparation of polyalcohols | Chemistry; Metallurgy | 13 | Expired |
| US5371292A | Preparation of 3-aminomethyl-3,5,5-trimethyl-cyclohexylamine | Chemistry; Metallurgy | 12 | Expired |
| US5495014A | Preparation of caprolactam | Chemistry; Metallurgy | 12 | Expired |
| US5739324A | Preparation of caprolactam | Chemistry; Metallurgy | 11 | Expired |
| US5756845A | Preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine | Chemistry; Metallurgy | 9 | Expired |
| US5717090A | Simultaneous preparation of caprolactam and hexamethylenediamine | Chemistry; Metallurgy | 8 | Expired |
| US5728317A | Polyisocyanate compositions having a long shelf life and obtainable by phosgene-free methods, their preparation and their use | Chemistry; Metallurgy | 7 | Expired |
| US6166207A | Preparation of bicyclic amidines and diazacycloalkenes | Chemistry; Metallurgy | 7 | Expired |
| US5557011A | Preparation of diamines | Chemistry; Metallurgy | 6 | Expired |
| US6022999A | Preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine having a cis/trans isomer ratio of at least 70:30 | Chemistry; Metallurgy | 6 | Expired |
| US5166443A | Preparation of 2,2-disubstituted pentane-1,5-diamines | Chemistry; Metallurgy | 5 | Expired |
| US5239120A | Preparation of 2-(3-aminopropyl)-cycloalkylamines | Chemistry; Metallurgy | 5 | Expired |
| US5840981A | Process for producing N-methyl-2(3,4 dimethoxyphenyl)-ethylamine | Performing Operations; Transporting | 4 | Expired |
| US5565583A | Preparation of 2-substituted but-2-ene-1, 4-dial-4-acetals and novel hemiacetals of glyoxal monoacetals | Chemistry; Metallurgy | 4 | Expired |
| US5481037A | Decontamination of tertiary amines from primary and secondary amines | Chemistry; Metallurgy | 4 | Expired |
| US5684201A | Preparation of aliphatic and cycloaliphatic oximes | Chemistry; Metallurgy | 4 | Expired |
| US5917080A | Preparation of 2-cyano-3,3-diarylacrylic esters | Chemistry; Metallurgy | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.