Elfert; Klaus
Patent Applications and Registrations
Patent applications and USPTO patent grants for Elfert; Klaus.The latest application filed is for "semipermeable membranes".
- Elfert; Klaus - Krefeld DE
- Elfert; Klaus - Dormagen DE
| Patent | Date |
|---|---|
| Semipermeable membranes Grant 4,383,923 - Elfert May 17, 1 | 1983-05-17 |
| Semipermeable membranes of aromatic disulfimide containing polyamides Grant 4,269,967 - Elfert , et al. May 26, 1 | 1981-05-26 |
| Process of using a semi-permeable membrane of acrylonitrile copolymers Grant 4,252,652 - Elfert , et al. February 24, 1 | 1981-02-24 |
| Semipermeable membranes of heterocyclic copolyamides Grant 4,221,903 - Elfert , et al. September 9, 1 | 1980-09-09 |
| Semipermeable membranes of copolyamides Grant 4,217,227 - Elfert , et al. August 12, 1 | 1980-08-12 |
| Separation of aromatic hydrocarbons from mixtures, using polyurethane membranes Grant 4,115,465 - Elfert , et al. September 19, 1 | 1978-09-19 |
| Semipermeable membranes of sulphonated polybenz-1,3-oxazin-2,4-diones Grant 4,069,215 - Elfert , et al. January 17, 1 | 1978-01-17 |
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