Hartmut Hetzel
14Patents
7h-index
24Co-inventors
66Inventor score
Filing activity: Aug 29, 1975 → Apr 29, 1999
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4051212A | Process for the continuous degradation of plastics | Emerging Cross-Sectional Technologies | 44 | Expired |
| US4147714A | Process for the preparation of polyisocyanates which contain biuret groups | Chemistry; Metallurgy | 21 | Expired |
| US4482750A | Process for removing alkaline catalysts from polyether polyols | Chemistry; Metallurgy | 18 | Expired |
| US4241043A | Method for evaporating solvents and reacting components in compound mixtures | Emerging Cross-Sectional Technologies | 16 | Expired |
| US5563296A | Continuous process for preparing aromatic amines | Performing Operations; Transporting | 13 | Expired |
| US4143072A | Process for the purification of polyethers using a tubular coil evaporator | Chemistry; Metallurgy | 12 | Expired |
| US3993641A | Process for the production of polyisocyanates containing uretdione groups | Chemistry; Metallurgy | 10 | Expired |
| US4136967A | Screw machine for the continuous degradation of plastics | Emerging Cross-Sectional Technologies | 7 | Expired |
| US5609735A | Process and a device for separating a solid residue from its solution in a stirred bed of material | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4992171A | Filtering device with agitator | Performing Operations; Transporting | 4 | Expired |
| US5384034A | Candle precoated filter for residual volume filtration | Performing Operations; Transporting | 3 | Expired |
| US4399236A | Process for separating polyurethane hydrolyzates into polyether and diamine | Emerging Cross-Sectional Technologies | 2 | Expired |
| US6271414A | Process for the isomeric separation of isocyanates | Chemistry; Metallurgy | 1 | Expired |
| US5817211A | Process and device for continuous evaporation to dryness of viscous solutions and suspensions with a tendency to stick | Performing Operations; Transporting | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.