David C. Molzahn
33Patents
12h-index
42Co-inventors
81Inventor score
Filing activity: Feb 25, 1988 → Feb 26, 2015
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6429342B1 | Polymerization of ethylene oxide using metal cyanide catalysts | Performing Operations; Transporting | 29 | Expired |
| US5030740A | Process for preparing linearly-extended polyalkylenepolyamines | Chemistry; Metallurgy | 29 | Expired |
| US4927931A | Preparation of alkyl-extended, alcohol-extended or amine-extended piperazines | Chemistry; Metallurgy | 25 | Expired |
| US4839460A | Novel polymers from aminated polyethers and formaldehyde | Chemistry; Metallurgy | 21 | Expired |
| US5256786A | Catalytic reforming of cyclic alkyleneamines | Chemistry; Metallurgy | 20 | Expired |
| US5073635A | Process of preparing linearly-extended polyalkylenepolyamines employing metal silicate catalysts | Chemistry; Metallurgy | 19 | Expired |
| US4983735A | Preparation of alcohol-extended and amine-extended piperazines | Chemistry; Metallurgy | 16 | Expired |
| US5554793A | Catalytic reforming of alkyleneamines | Chemistry; Metallurgy | 14 | Expired |
| US5288909A | Catalytic reforming of alkyleneamines | Chemistry; Metallurgy | 13 | Expired |
| US5387708A | Production of dialkyl carbonates using copper catalysts | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5166442A | Catalytic reforming of alkyleneamines | Chemistry; Metallurgy | 13 | Expired |
| US5410087A | Catalytic reforming of alkyleneamines | Chemistry; Metallurgy | 12 | Expired |
| US4996363A | Catalytic reforming of alkyleneamines to linearly-extended polyalkylenepolyamines | Chemistry; Metallurgy | 9 | Expired |
| US5011999A | Process of preparing non-cyclic polyalkylenepolyamines employing group VB metal catalysts | Chemistry; Metallurgy | 8 | Expired |
| US5145987A | Process for the preparation of cis-1,2-trans-4-cyclohexane tricarboxylic acid and esters | Chemistry; Metallurgy | 7 | Expired |
| US6423662B1 | Incipient wetness method for making metal-containing cyanide catalysts | Chemistry; Metallurgy | 7 | Expired |
| US6642423B2 | Polymerization of ethylene oxide using metal cyanide catalysts | Performing Operations; Transporting | 6 | Expired |
| US6229045A | Process for preparing carboxylic acids | Chemistry; Metallurgy | 5 | Expired |
| US5118850A | Catalytic reforming of alkyleneamines to linearly-extended polyalkylenepolyamines | Chemistry; Metallurgy | 3 | Expired |
| US5210307A | Catalytic reforming of alkyleneamines to linearly-extended polyalkylenepolyamines | Chemistry; Metallurgy | 3 | Expired |
| US7683161B2 | Selective reduction of spinosyn factors Et-J and Et-L to spinetoram | Chemistry; Metallurgy | 3 | Active |
| US8558027B2 | Production of mixtures of methylenedianiline and its higher homologues using calcined metal oxide-silica catalysts | Performing Operations; Transporting | 2 | Active |
| US5118851A | Process of preparing mixtures of polyalkylenepolyamines and alkanolpolyamines | Chemistry; Metallurgy | 1 | Expired |
| US8808662B2 | Process for production of a borohydride compound | Chemistry; Metallurgy | 1 | Active |
| US9035098B2 | Process for the conversion of aliphatic cyclic amines to aliphatic diamines | Chemistry; Metallurgy | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.