Patent US3148020A successfully refreshed from Google Patents.
US3148020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaped organic polymers-polysulfone grafts with organic polymer coating and production thereof
Assignee: EIDP Inc
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Filing: 1961-03-13
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Granted: 1964-09-08
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Expires: 1981-03-13
Abstract
No abstract record available.
Inventors
- 👤 Graham Boynton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:46
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/16; C08J7/18; Y; Y10; Y10S; Y10S8/00; Y10S8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A PROCESS OF IMPROVING THE STABILITY TOWARD DEGRADATION BY AN AQUEOUS ALKALI OF A COPOLYMER OF A POLYMERIC POLYSULFONE FORMED BY REACTION BETWEEN SULFUR DIOXIDE AND AN OLEFIN AND GRAFTER INTO AN ORGANIC POLYMER SUBSTRATE ITSELF HAVING A SUBSTANTIAL INHERENT RESISTANCE TO AQUEOUS ALKALI, THE STEP COMPRISING CONTACTING SAID COPOLYMER WITH AN AQUEOUS ALAKIL HAVING A PH OF AT LEAST 13, THEREBY REMOVING OLEFIN-POLYSULFONE FROM THE SURFACE UNTIL A RELATIVELY THIN EXTERNAL LAYER OF THE REGENERATED POLYMER SUBSTRATE IS FORMED, AND THEN TERMINATING THE CONTACT BETWEEN THE AQUEOUS ALKALI AND THE GRAFT COPOLYMER.
Claim 2
Dependent Claim
94 words
IN A PROCESS OF IMPROVING THE STABILITY TOWARD DEGRADATION BY AN AQUEOUS ALKALI OF A COPOLYMER OF A POLYMERIC POLYSULFONE FORMED BY REACTION BETWEEN SULFUR DIOXIDE AND AN OLEFIN AND GRAFTER INTO AN ORGANIC POLYMER SUBSTRATE ITSELF HAVING A SUBSTANTIAL INHERENT RESISTANCE TO AQUEOUS ALKALI, THE STEP COMPRISING CONTACTING SAID COPOLYMER WITH AN AQUEOUS ALAKIL HAVING A PH OF AT LEAST 13, THEREBY REMOVING OLEFIN-POLYSULFONE FROM THE SURFACE UNTIL A RELATIVELY THIN EXTERNAL LAYER OF THE REGENERATED POLYMER SUBSTRATE IS FORMED, AND THEN TERMINATING THE CONTACT BETWEEN THE AQUEOUS ALKALI AND THE GRAFT COPOLYMER.
References Cited (Backward Citations)
US1988550A
Cited
US2926126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |