Patent US2747224A successfully refreshed from Google Patents.
US3743597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Osmosis process
Assignee: Consiglio Nazionale delle Richerche
•
Filing: 1972-06-26
•
Granted: 1973-07-03
•
Expires: 1992-06-26
Abstract
Abstract OSMOSIS PROCESS UTILIZING AS THE SEMIPERMEABLE MEMBRANE, A BLEND OF AT LEAST TWO SYNTHETIC POLYAMIDES SELECTED FROM THE GROUP CONSISTING OF POLY(PIPERAZINISOPHTHALAMIDE), POLY-(TRANS - 2,5- DIMETHYL PIPERAZINTEREPHTHALAMIDE (AND POLY-(TRANS-2,5 -DIMETHYL PIPERAZIN-TRANS-TRANSMUCONAMIDE) OR A BLEND OF AT LEAST ONE SYNTHETIC POLYAMIDE SELECTED FROM THE GROUP CONSISTING OF POLY(PIPERAZINISOPHTHALAMIDE), POLY-(TRANS-2,5-DIMETHYL PIPERAZINTEREPHTHALAMIDE), AND POLY-(TRANS-2,5-DIMETHYL PIPERAZINTRANS-TRANS-MUCONAMIDE), AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF NYLON 6, NYLON 4, NYLON 6.6 AND NYLON 6.10.
Inventors
- 👤 L Credali
- 👤 P Parrini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:47
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/56
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |