US3457171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphitic oxide memberane for desalinating water
Assignee: Westinghouse Electric Corp
•
Filing: 1967-02-13
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Granted: 1969-07-22
•
Expires: 1987-02-13
Abstract
No abstract record available.
Inventors
- 👤 Leonard C Flowers
- 👤 Daniel Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:59
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/02; B01D71/021; B01D71/0211; B01D67/00; B01D67/0002; B01D67/0004; B01D67/00041; B01D2323/00; B01D2323/10; B01D2325/00; B01D2325/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2682686A
Cited
US3170867A
Cited
US3332815A
Cited
US3373056A
Cited
US3283813A
Cited
US3344928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |