US3566580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membrane separation
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1968-11-27
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Granted: 1971-03-02
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Expires: 1988-11-27
Abstract
Abstract The separation of mixtures; in which the various elements have different degrees of solubility in a liquid is enhanced by concurrently permeating vapor from said liquid and the membrane must have an attraction for said liquid.
Inventors
- 👤 Norman N Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:31
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; B01D53/268; B01D53/22; B01D53/228; B01D61/00; B01D61/36; B01D61/363
Claims Analysis
Total Claims: 0
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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) | 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 |