US2958656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating hydrocarbons using ethyl cellulose permselective membrane
Assignee: American Oil Co
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Filing: 1954-07-16
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Granted: 1960-11-01
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Expires: 1974-07-16
Abstract
No abstract record available.
Inventors
- 👤 James M Stuckey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:43
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/36; B01D61/364; B01D61/3641; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS WHICH COMPRISES CONTACTING A CHARGE LIQUID HYDROCARBON MIXTURE WITH ONE SIDE OF A THIN PLASTIC MEMBRANE WHICH IS FREE FROM HOLES, WHICH HAS A THICKNESS OF ABOUT .2 TO 5 MILS, AND WHICH IS COMPRISED OF CELLULOSE ETHER WHICH HAS FROM 50 TO 95% OF THE HYDROXYL GROUPS OF THE CELLULOSE MOLECULE CONVERTED TO ALKOXYL GROUPS, SAID ALKOXYL GROUPS HAVING FROM 2 TO 8 CARBON ATOMS, PERMEATING A PORTION OF THE LIQUID MIXTURE IN CONTACT WITH SAID MEMBRANE THROUGH SAID MEMBRANE, AND REMOVING FROM THE OPPOSITE SIDE OF SAID MEMBRANE A VAPORIZED PERMEATED PORTION HAVING A COMPOSITION DIFFERENT FROM SAID CHARGE LIQUID HYDROCARBON MIXTURE.
Claim 2
Dependent Claim
106 words
A PROCESS WHICH COMPRISES CONTACTING A CHARGE LIQUID HYDROCARBON MIXTURE WITH ONE SIDE OF A THIN PLASTIC MEMBRANE WHICH IS FREE FROM HOLES, WHICH HAS A THICKNESS OF ABOUT .2 TO 5 MILS, AND WHICH IS COMPRISED OF CELLULOSE ETHER WHICH HAS FROM 50 TO 95% OF THE HYDROXYL GROUPS OF THE CELLULOSE MOLECULE CONVERTED TO ALKOXYL GROUPS, SAID ALKOXYL GROUPS HAVING FROM 2 TO 8 CARBON ATOMS, PERMEATING A PORTION OF THE LIQUID MIXTURE IN CONTACT WITH SAID MEMBRANE THROUGH SAID MEMBRANE, AND REMOVING FROM THE OPPOSITE SIDE OF SAID MEMBRANE A VAPORIZED PERMEATED PORTION HAVING A COMPOSITION DIFFERENT FROM SAID CHARGE LIQUID HYDROCARBON MIXTURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |