Hetzel; Hartmut
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hetzel; Hartmut.The latest application filed is for "continuous process for preparing aromatic amines".
- Hetzel; Hartmut - K oln DE
- Hetzel; Hartmut - Cologne DE
| Patent | Date |
|---|---|
| Continuous process for preparing aromatic amines Grant 5,563,296 - Zarnack , et al. October 8, 1 | 1996-10-08 |
| Method for evaporating solvents and reacting components in compound mixtures Grant 4,241,043 - Hetzel December 23, 1 | 1980-12-23 |
| Process for the preparation of polyisocyanates which contain biuret groups Grant 4,147,714 - Hetzel , et al. April 3, 1 | 1979-04-03 |
| Process for the purification of polyethers using a tubular coil evaporator Grant 4,143,072 - Hetzel , et al. March 6, 1 | 1979-03-06 |
| Process for the continuous degradation of plastics Grant 4,051,212 - Grigat , et al. September 27, 1 | 1977-09-27 |
| Process for the production of polyisocyanates containing uretdione groups Grant 3,993,641 - Tiemann , et al. November 23, 1 | 1976-11-23 |
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