US3696028A
Expired / Lapsed
US
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Liquid membrane separation process
Assignee: NORMAN N LI
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Filing: 1970-08-24
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Granted: 1972-10-03
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Expires: 1990-08-24
Abstract
Abstract A PROCESS FOR SEPARATING COMPONENTS OF A HYDROCARBON MIXTURE BY SELECTIVE PERMEATION THROUGH A LIQUID SURFACTANT MEMBRANE CONTAINING A POLAR ADDITIVE.
Inventors
- 👤 Norman N Li
- 👤 Robert B Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:24
CPC Classifications
C; C10; C10G; C10G21/00; B; B01; B01D; B01D61/00; B01D61/38; B01D61/40; C07; C07C; C07C7/00; C07C7/144; C10G31/00; C10G31/11
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |