US3823133A
Expired / Lapsed
US
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Method for preparing adsorptive cellulose ethers
Assignee: Danisco Finland Oy
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Filing: 1973-05-17
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Granted: 1974-07-09
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Expires: 1993-05-17
Abstract
Abstract ADSORPTIVE CATIONIC CELLULOSE IS PREPARED BY INTRODUCING CATIONIC SUBSTITUENTS ONTO CELLULOSE IN AN ALKALINE AQUEOUS SOLUTION OF A SALT OF A STRONG ACID AND A STRONG BASE. THE DERIVATIZED CELLULOSE HAS A HIGH ADSORPTIVE CAPACITY FOR CERTAIN PROTEINACEOUS MATERIALS, E.G., ENZYMES.
Inventors
- 👤 L Hurst
- 👤 N Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:46
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/14; C08B11/145; C08B11/193
Claims Analysis
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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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |