Patent US3573277A successfully refreshed from Google Patents.
US3573277A
Expired / Lapsed
US
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Cellulosic ion exchange materials and method of making
Assignee: Tasman Vaccine Laboratories Ltd
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Filing: 1969-07-08
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Granted: 1971-03-30
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Expires: 1989-07-08
Abstract
Abstract ION EXCHANGE MATERIALS ARE DESCRIBED WHICH ARE SUITABLE FOR SEPARATING MATERIALS SUCH AS PROTEINS AND FOR PURIFYING AQUEOUS EFFLUENTS. THESE EXCHANGE MATERIALS ARE PREPARED FROM REGENERATED CELLULOSE BY CROSS-LINKING AND INTRODUCTION OF EXCHANGE GROUPS TO GIVE CATIONIC OR ANIONIC EXCHANGERS.
Inventors
- 👤 Roy Arthur Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:57
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |