US3536612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increasing permeability of reverse osmosis membranes
Assignee: Canadian Patents and Development Ltd
•
Filing: 1968-10-28
•
Granted: 1970-10-27
•
Expires: 1988-10-28
Abstract
No abstract record available.
Inventors
- 👤 Jindrich Kopecek
- 👤 Sprinivasa Sourirajan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:57
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D2323/00; B01D2323/28; B01D61/00; B01D61/02; B01D61/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3355382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |