Ulrich Penzel
23Patents
9h-index
79Co-inventors
74Inventor score
Filing activity: Mar 3, 2000 → Feb 5, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6140539A | Preparation of amines | Performing Operations; Transporting | 43 | Expired |
| US7584629B2 | Separation of a substance mixture consisting of hydrogen chloride and phosgene | Emerging Cross-Sectional Technologies | 38 | Expired |
| US6576788B1 | METHOD FOR PRODUCING MIXTURES CONSISTING OF DIPHENYLMETHANE DIISOCYANATES AND POLYPHENYLENE-POLYMETHYLENE-POLYISOCYANATES CONTAINING A REDUCED AMOUNT OF CHLORINATED SECONDARY PRODUCTS AND WITH A REDUCED IODINE COLOR INDEX | Chemistry; Metallurgy | 33 | Expired |
| 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 |
| US6350911B1 | Method for producing amines | Performing Operations; Transporting | 14 | Expired |
| US6900348B1 | Light isocyanates, method for producing them and use thereof | Chemistry; Metallurgy | 14 | Expired |
| US6831192B2 | Process for preparing methylenedianiline and methylenebis(phenyl isocyanate) | Chemistry; Metallurgy | 11 | Expired |
| US7851648B2 | Method for the continuous production of isocyanates | Chemistry; Metallurgy | 9 | Active |
| US7524405B2 | Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6896401B2 | Method and device for reducing byproducts in the mixture of educt streams | Performing Operations; Transporting | 7 | Expired |
| US7091383B2 | Method for the production of amines | Chemistry; Metallurgy | 6 | Expired |
| US7595424B2 | Method for producing aromatic amines or aliphatic amino alcohols | Performing Operations; Transporting | 5 | Expired |
| US7342134B2 | Method for the distillative recovery of toluylenediamine | Chemistry; Metallurgy | 4 | Expired |
| US8829232B2 | Process for preparing aromatic isocyanates | Chemistry; Metallurgy | 3 | Active |
| US7408086B2 | Ni/TiO2 hydrogenation catalyst | Performing Operations; Transporting | 3 | Expired |
| US8895783B2 | Monitoring of the stoichiometric ratio in the reaction of nitroaromatics with hydrogen | Chemistry; Metallurgy | 2 | Active |
| US8759569B2 | Process for the production of isocyanates, preferably diisocyanates and polyisocyanates with solvent recirculation | Chemistry; Metallurgy | 2 | Active |
| US7468461B2 | Method for the production of amines | Performing Operations; Transporting | 1 | Active |
| US8519179B2 | Method of measuring entry of water into phosgene-conducting plants | Physics | 1 | Active |
| US7928270B2 | Process for distillatively removing dinitrotoluene from process wastewater from the preparation of dinitrotoluene by nitrating of toluene with nitrating acid | Chemistry; Metallurgy | 1 | Active |
| US8609899B2 | Process for preparing toluenediamine by hydrogenation of dinitrotoluene | Chemistry; Metallurgy | 0 | Active |
| US6867324B2 | Method and device for the continuous production of organic mono or polyisocyanates | Performing Operations; Transporting | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.