US3696031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Osmosis process
Assignee: Consiglio Nazionale delle Richerche
•
Filing: 1970-07-06
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Granted: 1972-10-03
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Expires: 1990-07-06
Abstract
Abstract OSMOSIS PROCESS UTILIZING AS THE SEMI-PERMEABLE MEMBRANE A POLYAMIDE COMPRISING THE REACTION PRODUCT OF A PIPERAZINE WITH A DICARBOXYLIC ACID OR ACID ANHYDRIDE.
Inventors
- 👤 Lino Credali
- 👤 Paolo Parrini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:28
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/56
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |