Frank E. Herkes
28Patents
9h-index
17Co-inventors
72Inventor score
Filing activity: Nov 25, 1975 → Mar 24, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4283306A | Crystalline silica and use in alkylation of aromatics | Emerging Cross-Sectional Technologies | 83 | Expired |
| US5700934A | Process for the preparation of epsilon-caprolactam and epsilon-caprolactam precursors | Chemistry; Metallurgy | 54 | Expired |
| US5814508A | Preparation of lactams from aliphatic .alpha.,.omega.-dinitriles | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5858736A | Preparation of lactams from aliphatic .alpha.,.omega.-dinitriles | Chemistry; Metallurgy | 19 | Expired |
| US4444989A | Methylation of toluene to para-xylene catalyzed by crystalline silica | Emerging Cross-Sectional Technologies | 15 | Expired |
| US6900337B2 | Production of 5-methyl-1-hydrocarbyl-2-pyrrolidone by reductive amination of levulinic acid | Chemistry; Metallurgy | 11 | Expired |
| US5070202A | Cyanobutylation of amines with 2-pentenitrile | Chemistry; Metallurgy | 10 | Expired |
| US5922589A | Preparation of lactams from aliphatic .alpha.,.omega.-Dinitiles | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4885391A | Production of C.sub.4 to C.sub.12 amines | Chemistry; Metallurgy | 9 | Expired |
| US5717089A | Process for the preparation of E-caprolactam | Chemistry; Metallurgy | 8 | Expired |
| US5877314A | Process to continuously prepare an aqueous mixture of episilon caprolactum and episilon caprolactum precursors | Emerging Cross-Sectional Technologies | 5 | Expired |
| US6066490A | Nitrilase-producing acidovorax facilis | Emerging Cross-Sectional Technologies | 5 | Expired |
| US6077955A | Preparation of lactams from aliphatic .alpha..omega.-dinitriles | Emerging Cross-Sectional Technologies | 4 | Expired |
| US6562603B2 | 3-hydroxycarboxylic acid production and use in branched polymers | Chemistry; Metallurgy | 4 | Expired |
| US4020051A | Control of nitrogen oxide reactions in off-gases from the diazotization/coupling of aromatic amines | Chemistry; Metallurgy | 3 | Expired |
| US5898085A | Production of 1,3-diaminopentane by hydrogenation of 3-aminopentanenitrile | Chemistry; Metallurgy | 3 | Expired |
| US5902883A | Cyanobutylation of ammonia, alkylamines and hydrazine with 3-pentenenitrile, 4-pentenenitrile or mixtures thereof | Chemistry; Metallurgy | 3 | Expired |
| US5491264A | Preparation of isophorone diamine | Chemistry; Metallurgy | 3 | Expired |
| US5072044A | Preparation of ortho-phenylenediamine | Chemistry; Metallurgy | 2 | Expired |
| US6384263B1 | Process for making 3-hydroxyalkanelnitriles and conversion of the 3-hydroxyalkanelnitrile to an hydroxyaminoalkane | Chemistry; Metallurgy | 2 | Expired |
| US5936114A | Preparation of lactams from aliphatic .alpha., .omega.-dinitriles | Emerging Cross-Sectional Technologies | 2 | Expired |
| US5908954A | Preparation of lactams from aliphatic .alpha., .omega.-dinitriles | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4279815A | Production of high-quality aromatic amino azo compounds by the rearrangement of 1,3-diaryl triazenes | Chemistry; Metallurgy | 1 | Expired |
| US5834617A | Selective dimerization of pentenenitrile | Chemistry; Metallurgy | 0 | Expired |
| US7138480B2 | 3-Hydroxycarboxylic acid production and use in branched polymers | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.