Patent US2947645A successfully refreshed from Google Patents.
US2947645A
Expired / Lapsed
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⏱️ 0.0 years remaining
Stable cellulose ether compositions and method for producing the same
Assignee: Akzo Nobel UK PLC
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Filing: 1957-10-29
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Granted: 1960-08-02
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Expires: 1977-10-29
Abstract
No abstract record available.
Inventors
- 👤 David T Milne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:21
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L1/284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A COMPOSITION OF MATTER COMPIRSING A STABLE, COLLOIDAL DISPERSION OF A WATER-INSOLUBLE HYDROXYETHYL CELLULOSE ETHER IN AN AQUEOUS MEDIUM HAVING A PH BETWEEN 5 AND 9, THE CELLULOSE ETHER HAVING ON AN AVERAGE THE EQUIVALENT OF 0.3 TO 1.3 HYDROXYETHL GROUPS PER GLUCOSE RESIDUE AND BEING SOLUBLE IN AN AQUEOUS SOLUTION CONTAINING FROM 0.5% TO 4% OF AN ALKALI METAL HYDROXIDE, THE AQUEOUS MEDIUM CONSISTING ESSENTIALLY OF WATER AND AN ALKALI METAL SALT SELECTED FROM THE GROUP CONSISTING OF FORMATES, ACETATES, PROPIONATES, BUTYRATES, MALEATES, XYLATES AND FLUOSILICATES.
Claim 2
Dependent Claim
87 words
A COMPOSITION OF MATTER COMPIRSING A STABLE, COLLOIDAL DISPERSION OF A WATER-INSOLUBLE HYDROXYETHYL CELLULOSE ETHER IN AN AQUEOUS MEDIUM HAVING A PH BETWEEN 5 AND 9, THE CELLULOSE ETHER HAVING ON AN AVERAGE THE EQUIVALENT OF 0.3 TO 1.3 HYDROXYETHL GROUPS PER GLUCOSE RESIDUE AND BEING SOLUBLE IN AN AQUEOUS SOLUTION CONTAINING FROM 0.5% TO 4% OF AN ALKALI METAL HYDROXIDE, THE AQUEOUS MEDIUM CONSISTING ESSENTIALLY OF WATER AND AN ALKALI METAL SALT SELECTED FROM THE GROUP CONSISTING OF FORMATES, ACETATES, PROPIONATES, BUTYRATES, MALEATES, XYLATES AND FLUOSILICATES.
References Cited (Backward Citations)
US2331858A
Cited
US2469764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |