US3556992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anisotropic ultrafiltration membrane having adhering coating and methods of forming and using this membrane
Assignee: Amicon Corp
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Filing: 1969-07-22
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Granted: 1971-01-19
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Expires: 1989-07-22
Abstract
Abstract AN ANISTROPIC ULTRAFILTRATION MEMBRANE COMPRISING A POROUS SUPPORT LAYER, A LESS POROUS BARRIER LAYER INTEGRAL THEREWITH, AND AN ADHERING COATING OF IRREVERSIBLY COMPRESSED GEL, SAID COATING ADHERING TO SAID MEMBRANE WHEN IN CONTACT WITH A FLOWING LIQUID AT A LIQUID SHEAR RATE OF ABOUT 16000 SEC.-1; AND METHOD FOR MAKING SAME.
Inventors
- 👤 Arthur A Massucco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:22
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/1218; B01D69/14
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |