US3567632A
Expired / Lapsed
US
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Permselective,aromatic,nitrogen-containing polymeric membranes
Assignee: EIDP Inc
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Filing: 1969-08-08
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Granted: 1971-03-02
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Expires: 1989-08-08
Abstract
Abstract PERMSELECTIVE BARRIERS OR MEMBRANES PREPARED FROM SYNTHETIC, ORGANIC, NITROGEN-LINKED AROMATIC POLYMERS OF THE FORMULA -LR- WHERE L IS A SELECTED NITROGEN-CONTAINING FUNCTIONAL LINKAGE SUCH AS AN AMIDE LINKAGE, AND R IS SELECTED AROMATIC-CONTAINING LINKAGE SUCH AS PHENYLENE. THE MEMBRANES ARE USEFUL IN SEPARATING COMPONENTS OF FLUID MIXTURES OR SOLUTIONS SUCH AS WATER CONTAINING DISSOLVED SALTS.
Inventors
- 👤 John William Richter
- 👤 Harvey Herbert Hoehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:27
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/56; B01D71/58; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3834; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C08G73/00; C08G73/06; C08G73/08
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |