Frank Ohlbach
28Patents
8h-index
24Co-inventors
67Inventor score
Filing activity: Aug 9, 1999 → Feb 12, 2004
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6462220B1 | Method for simultaneous preparation of 6-aminocapronitrile and hexamethylene diamine | Chemistry; Metallurgy | 30 | Expired |
| US6699960B1 | Method for producing polyamides from dinitriles and diamines | Chemistry; Metallurgy | 23 | Expired |
| US6265602A | Method for hydrogenating aliphatic alpha-, omega-dinitriles | Chemistry; Metallurgy | 22 | Expired |
| US6348601B2 | Preparation of N-methyl-2-pyrrolidone (NMP) | Chemistry; Metallurgy | 21 | Expired |
| US6297394A | Iron-based catalyst for hydrogenating alpha-, omega-dinitriles | Chemistry; Metallurgy | 16 | Expired |
| US6469211B2 | Hydrogenation of nitriles over Raney catalysts | Chemistry; Metallurgy | 14 | Expired |
| US7147757B2 | Method for separating an azepine derivative out of a mixture containing an amine an azepine derivative | Emerging Cross-Sectional Technologies | 13 | Expired |
| US6852669B2 | Hydrogenation catalyst | Chemistry; Metallurgy | 8 | Expired |
| US6790995B2 | Preparation of primary and secondary amines from nitriles | Chemistry; Metallurgy | 8 | Expired |
| US6359178B1 | Method for producing hexamethylene diamine | Chemistry; Metallurgy | 5 | Expired |
| US7091153B2 | Hydrogenation catalyst | Chemistry; Metallurgy | 5 | Expired |
| US6677449B2 | Preparation of caprolactam | Chemistry; Metallurgy | 3 | Expired |
| US6153748A | Method for hydrogenating compounds from the group of imines or enamines | Chemistry; Metallurgy | 3 | Expired |
| US6683179B2 | Preparation of caprolactam | Chemistry; Metallurgy | 3 | Expired |
| US6559318B1 | Method for producing (2S,4R,9S)-octahydro-1H-indole-2-carboxylic acid and intermediate products therefor | Chemistry; Metallurgy | 2 | Expired |
| US6686465B2 | Preparation of cyclic lactams | Chemistry; Metallurgy | 2 | Expired |
| US6815388B1 | Method for activating passivated iron | Performing Operations; Transporting | 2 | Expired |
| US6972075B2 | Method for removing 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine | Emerging Cross-Sectional Technologies | 2 | Expired |
| US6677486B2 | Hydrogenation of nitriles over Raney catalysts | Chemistry; Metallurgy | 2 | Expired |
| US6278023A | Method for producing aliphatic alpha-, omega-diamines | Chemistry; Metallurgy | 2 | Expired |
| US6878798B2 | Method for producing a polymer, using caprolactam | Emerging Cross-Sectional Technologies | 2 | Expired |
| US6905997B2 | Method for generating catalysts | Emerging Cross-Sectional Technologies | 1 | Expired |
| US6346641B1 | Method for simultaneous production of 6-aminocapronitrile and hexamethylenediamine | Chemistry; Metallurgy | 1 | Expired |
| US6828457B2 | Method for reducing the content of an unsaturated amine in a mixture containing an amine and a nitrile | Chemistry; Metallurgy | 1 | Expired |
| US6683180B2 | Method for the production of caprolactam | Emerging Cross-Sectional Technologies | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.