Patent US3625734A successfully refreshed from Google Patents.
US3625734A
Expired / Lapsed
US
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Ultra-thin liquid membrane construction
Assignee: Government of the United States of America
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Filing: 1969-10-16
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Granted: 1971-12-07
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Expires: 1989-10-16
Abstract
Abstract A METHOD FOR THE PREPARATION OF A STABLE IMMOBILIZED LIQUID MEMBRANE HAVING A THICKNESS OF 0.1 MIL, OR LESS, IS DESCRIBED. THE PREPARATION OF SUCH A MEMBRANE CONSTRUCTION COMPRISING POLYETHYLENE GLYCOL SUPPORTED ON A POROUS POLYMER MEMBRANE (RENDERED NON-WETTING BY THE DEPOSITION OF SUB-MICRON SIZE PARTICLES OF POLYTETRA-FLUOROETHYLENE THEREOVER) IS DESCRIBED, THE PARTICULAR MEMBRANE HAVING SPECIFIC APPLICATION TO THE SEPARATION OF SULPHUR DIOXIDE FROM GAS MIXTURES.
Inventors
- 👤 William J Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:48
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/38
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |