Inventor
HERKES FRANK E
US13 patents
⚠️ This page may combine multiple inventors who share the name “HERKES FRANK E”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
DU PONT
9 patentsUS4283306AAug 11, 1981
Crystalline silica and use in alkylation of aromatics
DU PONT95 citations95
US6900337B2May 31, 2005
Production of 5-methyl-1-hydrocarbyl-2-pyrrolidone by reductive amination of levulinic acid
DU PONT23 citations92
US4885391ADec 5, 1989
Production of C4 to C12 amines
DU PONT18 citations81
US4444989AApr 24, 1984
Methylation of toluene to para-xylene catalyzed by crystalline silica
DU PONT20 citations81
US5491264AFeb 13, 1996
Preparation of isophorone diamine
DU PONT7 citations73
US5072044ADec 10, 1991
Preparation of ortho-phenylenediamine
DU PONT6 citations73
US5070202ADec 3, 1991
Cyanobutylation of amines with 2-pentenitrile
DU PONT15 citations73
US6384263B1May 7, 2002
Process for making 3-hydroxyalkanelnitriles and conversion of the 3-hydroxyalkanelnitrile to an hydroxyaminoalkane
DU PONT5 citations62
US5149809ASep 22, 1992
Synthesis of 2-alkylhexahydropyrimidines from nitriles
DU PONT0 citations51
DSM NV
3 patentsUS5700934ADec 23, 1997
Process for the preparation of epsilon-caprolactam and epsilon-caprolactam precursors
DSM NV63 citations94
US5717089AFeb 10, 1998
Process for the preparation of E-caprolactam
DSM NV10 citations71
US5877314AMar 2, 1999
Process to continuously prepare an aqueous mixture of episilon caprolactum and episilon caprolactum precursors
DSM NV8 citations66