Inventor · Mülheim an der Ruhr, DE

Frank Ohlbach

28Patents
8h-index
24Co-inventors
67Inventor score

Filing activity: Aug 9, 1999 → Feb 12, 2004

Most-cited inventions

PatentTitleAreaCited byStatus
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.