Patent US2574533A successfully refreshed from Google Patents.
US2574533A
Expired / Lapsed
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Dialyzing membrane and process of dialysis
Assignee: Akzo Nobel UK PLC
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Filing: 1949-05-24
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Granted: 1951-11-13
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Expires: 1969-05-24
Abstract
No abstract record available.
Inventors
- 👤 Ralph T K Cornwell
- 👤 Edward J Dunn
- 👤 Alfred W Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:09
CPC Classifications
C; C13; C13B; C13B35/00; C13B35/08; B; B01; B01D; B01D61/00; B01D61/24; B01D61/243; B01D71/00; B01D71/06; B01D71/08; B01D71/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
THE METHOD OF SEPARATING MATERIALS OF DIFFERING MOLECULAR SIZE AND CONSTITUTION FROM A MIXTURE THEREOF CONTAINING DISCOLORING BODIES COMPRISING THE STEP OF DIALYZING THE MIXTURE WITH A SEMI-PERMEABLE MEMBRANE COMPRISING A PELLICLE OF REGENERATED CELLULOSE CONTAINING BETWEEN ABOUT 1/2 AND 35% BY WEIGHT OF FINELY DIVIDED ACTIVATED CARBON.
Claim 2
Independent Claim
48 words
THE METHOD OF SEPARATING MATERIALS OF DIFFERING MOLECULAR SIZE AND CONSTITUTION FROM A MIXTURE THEREOF CONTAINING DISCOLORING BODIES COMPRISING THE STEP OF DIALYZING THE MIXTURE WITH A SEMI-PERMEABLE MEMBRANE COMPRISING A PELLICLE OF REGENERATED CELLULOSE CONTAINING BETWEEN ABOUT 1/2 AND 35% BY WEIGHT OF FINELY DIVIDED ACTIVATED CARBON.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |