Hartmut Knofel
36Patents
9h-index
16Co-inventors
72Inventor score
Filing activity: Jul 30, 1973 → Mar 28, 1996
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4692550A | Continuous process for thermal splitting of carbamic acid esters | Chemistry; Metallurgy | 32 | Expired |
| US4087459A | Process for the preparation of polyamines | Chemistry; Metallurgy | 19 | Expired |
| US3996283A | Process for the production of polyamines | Chemistry; Metallurgy | 17 | Expired |
| US5196591A | Process for the production of polynuclear aromatic polyamines | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5359141A | Process for the production of polynuclear aromatic polyamines | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4259526A | Process for the preparation of mixtures of polyamines of the polyamino-polyaryl-polymethylene type | Chemistry; Metallurgy | 11 | Expired |
| US3952042A | Process for the production of polyisocyanates | Chemistry; Metallurgy | 11 | Expired |
| US4914236A | Process for the preparation of multinuclear aromatic polyamines | Chemistry; Metallurgy | 11 | Expired |
| US4924028A | Process for the production of polynuclear aromatic polyamines | Chemistry; Metallurgy | 10 | Expired |
| US4093658A | Process for the preparation of aromatic polyamines | Chemistry; Metallurgy | 9 | Expired |
| US4061678A | Process for the preparation of aromatic polyamines | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5043471A | Process for the preparation of polyisocyanates | Chemistry; Metallurgy | 6 | Expired |
| US4405527A | Process for the preparation of polyisocyanates | Chemistry; Metallurgy | 5 | Expired |
| US4094907A | Process for the preparation of polyamines | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4675437A | Cycloaliphatic triisocyanates | Chemistry; Metallurgy | 4 | Expired |
| US5684180A | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Chemistry; Metallurgy | 4 | Expired |
| US4603189A | Triisocyanates and a process for their preparation | Chemistry; Metallurgy | 4 | Expired |
| US4613687A | Polyisocyanates of the diphenyl methane series | Chemistry; Metallurgy | 4 | Expired |
| US5679841A | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Chemistry; Metallurgy | 4 | Expired |
| US4025557A | Process for the production of polyamines | Chemistry; Metallurgy | 3 | Expired |
| US4761498A | Diisocyanates and diisocyanate mixtures based on diphenylmethane, processes for their production and their use as isocyanate component in the production of polyurethane plastics by the isocyanate polyaddition process | Chemistry; Metallurgy | 3 | Expired |
| US4879408A | Cycloaliphatic diisocyanates optionally in the form of isomer mixtures and a process for their production | Chemistry; Metallurgy | 3 | Expired |
| US4879409A | Cycloaliphatic diisocyanates, optionally in the form of isomeric mixtures and a process for their preparation | Chemistry; Metallurgy | 3 | Expired |
| US5663424A | Fractionation and purification of aromatic polyamine mixtures and the use thereof | Chemistry; Metallurgy | 3 | Expired |
| US4786751A | Dissocyanates, diisocyanate mixtures and a process for their production | Chemistry; Metallurgy | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.