US3332894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl carbonate desalination membrane and a method of producing the same
Assignee: Individual
•
Filing: 1966-12-06
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Granted: 1967-07-25
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Expires: 1986-12-06
Abstract
No abstract record available.
Inventors
- 👤 Paul A Cantor
- 👤 Robert E Kesting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:27
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/44
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 words
THE METHOD OF MAKING A REVERSE OSMOSIS MEMBRANE COMPRISING (A) FORMING A CASTING SOLUTION CONTAINING FROM 1820% POLYVINYLENE CARBONATE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAMIDE, DIMETHYLSULFOXIDE AND ACETONE; (B) CASTING THE SOLUTION ON A SMOOTH SURFACE TO FORM A THIN UNIFORM MEMBRANE LAYER; (C) DRYING SAID MEMBRANE LAYER AT ABOUT 20-40*C.; (D) IMMERSING SAID MEMBRANE LAYER IN WATER TO CAUSE IT TO FLOAT FREE OF THE SMOOTH SURFACE.
Claim 2
Independent Claim
72 words
THE METHOD OF MAKING A REVERSE OSMOSIS MEMBRANE COMPRISING (A) FORMING A CASTING SOLUTION CONTAINING FROM 1820% POLYVINYLENE CARBONATE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAMIDE, DIMETHYLSULFOXIDE AND ACETONE; (B) CASTING THE SOLUTION ON A SMOOTH SURFACE TO FORM A THIN UNIFORM MEMBRANE LAYER; (C) DRYING SAID MEMBRANE LAYER AT ABOUT 20-40*C.; (D) IMMERSING SAID MEMBRANE LAYER IN WATER TO CAUSE IT TO FLOAT FREE OF THE SMOOTH SURFACE.
Claim 3
Dependent Claim
9 words
THE PRODUCT FORMED BY THE METHOD OF CLAIM 1.
References Cited (Backward Citations)
US3133132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |