Patent US3276598A successfully refreshed from Google Patents.
US3276598A
Expired / Lapsed
US
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Supported dialysis membrane
Assignee: Dow Chemical Co
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Filing: 1961-10-24
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Granted: 1966-10-04
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Expires: 1981-10-24
Abstract
No abstract record available.
Inventors
- 👤 Alan S Michaels
- 👤 Richard G Miekka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:16
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/76; B01D71/80; B01D67/00; B01D67/0002; B01D67/0004; B01D69/00; B01D69/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A SUPPORTED DIALYSIS MEMBRANE CONSISTING ESSENTIALLY OF A FORAMINOUS SUPPORTING MEMBER AND A CONTINUOUS FILM ABOUT 200 A. IN THICKNESS THEREON, SAID FILM BEING PRODUCED BY THE COPRECIPITATION OF A POLUCATION AND A POLYANION AT THE INTERFACE BETWEEN AN AQUEOUS SOLUTION OF A HOMOPOLYMER OF VINYLBENZYLTRIMETHYL AMMONIUM CHLORIDE AND AN AQUEOUS SOLUTION OF A HOMOPOLYMER OF SODIUM STYRENE SULFONATE, SAID INTERFACE BEING DEFINED BY SAID FORAMINOUS SUPPORTING MEMBER.
Claim 2
Dependent Claim
68 words
A SUPPORTED DIALYSIS MEMBRANE CONSISTING ESSENTIALLY OF A FORAMINOUS SUPPORTING MEMBER AND A CONTINUOUS FILM ABOUT 200 A. IN THICKNESS THEREON, SAID FILM BEING PRODUCED BY THE COPRECIPITATION OF A POLUCATION AND A POLYANION AT THE INTERFACE BETWEEN AN AQUEOUS SOLUTION OF A HOMOPOLYMER OF VINYLBENZYLTRIMETHYL AMMONIUM CHLORIDE AND AN AQUEOUS SOLUTION OF A HOMOPOLYMER OF SODIUM STYRENE SULFONATE, SAID INTERFACE BEING DEFINED BY SAID FORAMINOUS SUPPORTING MEMBER.
References Cited (Backward Citations)
GB728508A
Cited
US2832746A
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US2832747A
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US2955067A
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US3041292A
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US2961417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |