US3364288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fresh water recovery
Assignee: University of California Berkeley
•
Filing: 1962-05-25
•
Granted: 1968-01-16
•
Expires: 1982-05-25
Abstract
No abstract record available.
Inventors
- 👤 Loeb Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:13
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01D67/0023; B01D67/003; B01D71/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A METHOD OF PREPARING A SEMIPERMEABLE MEMBRANE ADAPTED TO PERMIT SUBSTANTIALLY SELECTIVE DIFFUSION THERETHROUGH OF A COMPONENT OF A SOLUTION COMPRISING: (A) DISSOLVING (I) A MEMBER SELECTED FROM THE GROUP CONSISTING OF ETHER AND ESTER CELLULOSIC DERIVATIVES HAVING THE FORMULA
Claim 2
Independent Claim
40 words
A METHOD OF PREPARING A SEMIPERMEABLE MEMBRANE ADAPTED TO PERMIT SUBSTANTIALLY SELECTIVE DIFFUSION THERETHROUGH OF A COMPONENT OF A SOLUTION COMPRISING: (A) DISSOLVING (I) A MEMBER SELECTED FROM THE GROUP CONSISTING OF ETHER AND ESTER CELLULOSIC DERIVATIVES HAVING THE FORMULA
References Cited (Backward Citations)
US1688457A
Cited
US2088642A
Cited
US2329983A
Cited
US2317131A
Cited
US2418211A
Cited
US2810932A
Cited
US2926104A
Cited
US2829944A
Cited
US3026571A
Cited
US3133132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |