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US3775308A
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Method for preparation of composite semipermeable membrane
Assignee: INTERIOR
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Filing: 1972-05-18
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Granted: 1973-11-27
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Expires: 1992-05-18
Abstract
Abstract A SEMIPERMEABLE COMPOSITE MEMBRANE IS FORMED BY ELECTRODELESS GLOW DISCHARGE POLYMERIZATION OF AN ORGANIC MONOMER IN THE PRESENCE OF A POROUS SUPPORT, THE POLYM- ERIZATION RESULTING IN DEPOSITION OF A THIN FILM OF POLYMER ON THE SURFACE OF THE SUPPORT.
Inventors
- 👤 H Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:10
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/127; C; C08; C08F; C08F2/00; C08F2/46; C08F2/52
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |