Patent US2978446A successfully refreshed from Google Patents.
US2978446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level-off d.p. cellulose products
Assignee: Akzo Nobel UK PLC
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Filing: 1957-01-28
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Granted: 1961-04-04
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Expires: 1977-01-28
Abstract
No abstract record available.
Inventors
- 👤 Orlando A Battista
- 👤 Patricia A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:25
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/05; C03; C03C; C03C17/00; C03C17/28; C03C17/32; C03C25/00; C03C25/10; C03C25/465; C03C25/47; C08B; C08B15/00; C08B15/02; C08B15/08; C08L; C08L1/00; C08L1/02; D; D06; D06B; D06B13/00; D06M; D06M15/00; D06M15/01; D06M15/03; D06M15/05; D06M15/15; C08J2301/00; C08J2301/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A METHOD OF FORMING A STABLE DISPERSION OF LEVELOFF D.P. CELLULOSE IN AN AQUEEOUS MEDIUM WHICH COMPRISES HYDROLYZING CELLULOSE IN AN ACID MEDIUM CONTAINING AS ITS ACIDIC CONSTITUENT AN ACID OF THE GROUP CONSISTING OF HYDROCHLORIC ACID AND SULFURIC ACID TO FORM LEVEL-OFF D.P. CELLULOSE, WASHING THE LEVEL-OFF D.P. CELLULOSE WITH AN AQUEOUS MEDIUM TO FREE THE CELLULOSE OF ACID AND SUBJECTING THE ACID-FREE LEVEL-OFF D.P. CELLULOSE OF MECHANICAL DISINTEGRATION IN AN AQUEOUS MEDIUM TO FORM DISINTEGRATED AGGREGATES OF CELLULOSE CRYSTALLITES, ADJUSTING THE PH OF THE MEDIUM TO A PH OF BETWEEN SUBSTANTIALLY NEUTRAL AND 11 TO FORM A STABLE DISPERSION, THE STABLE DISPERSION BEING FURTHER CHARACTERIZED BY FORMING AN EXTREMELY ADHERENT FILM ON GLASS WHEN THE DISPERSION IS APPLIED TO GLASS AND THE APPLIED DISPERSION IS DRIED.
Claim 2
Independent Claim
128 words
A METHOD OF FORMING A STABLE DISPERSION OF LEVELOFF D.P. CELLULOSE IN AN AQUEEOUS MEDIUM WHICH COMPRISES HYDROLYZING CELLULOSE IN AN ACID MEDIUM CONTAINING AS ITS ACIDIC CONSTITUENT AN ACID OF THE GROUP CONSISTING OF HYDROCHLORIC ACID AND SULFURIC ACID TO FORM LEVEL-OFF D.P. CELLULOSE, WASHING THE LEVEL-OFF D.P. CELLULOSE WITH AN AQUEOUS MEDIUM TO FREE THE CELLULOSE OF ACID AND SUBJECTING THE ACID-FREE LEVEL-OFF D.P. CELLULOSE OF MECHANICAL DISINTEGRATION IN AN AQUEOUS MEDIUM TO FORM DISINTEGRATED AGGREGATES OF CELLULOSE CRYSTALLITES, ADJUSTING THE PH OF THE MEDIUM TO A PH OF BETWEEN SUBSTANTIALLY NEUTRAL AND 11 TO FORM A STABLE DISPERSION, THE STABLE DISPERSION BEING FURTHER CHARACTERIZED BY FORMING AN EXTREMELY ADHERENT FILM ON GLASS WHEN THE DISPERSION IS APPLIED TO GLASS AND THE APPLIED DISPERSION IS DRIED.
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) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |