Zengel; Hans
Patent Applications and Registrations
Patent applications and USPTO patent grants for Zengel; Hans.The latest application filed is for "process for the preparation of n,n'-disubstituted guanidines".
- Zengel; Hans - Kleinwallstadt DE
| Patent | Date |
|---|---|
| Process for the preparation of N,N'-disubstituted guanidines Grant 4,898,978 - Bergfeld , et al. February 6, 1 | 1990-02-06 |
| Thick polyimide-metal laminates with high peel strength Grant 4,522,880 - Klostermeier , et al. June 11, 1 | 1985-06-11 |
| Polyfunctional isocyanates free of alkali and urea groups Grant 4,301,257 - Zengel , et al. November 17, 1 | 1981-11-17 |
| Polyurethanes from trans-cyclohexane-1,4-diisocyanate Grant 4,256,869 - Schulze , et al. March 17, 1 | 1981-03-17 |
| Process for the preparation of nitrosobenzene Grant 4,178,315 - Zengel , et al. December 11, 1 | 1979-12-11 |
| Process for the production of aromatic and cycloaliphatic dicarboxylic acid diamides Grant 4,053,510 - Zengel , et al. October 11, 1 | 1977-10-11 |
| Process for the production of terephthalic acid dichloride Grant 3,878,244 - Zengel , et al. April 15, 1 | 1975-04-15 |
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