US2667482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of water-soluble salts of certain cellulose derivatives of improved physical form
Assignee: Imperial Chemical Industries Ltd
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Filing: 1951-01-16
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Granted: 1954-01-26
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Expires: 1971-01-16
Abstract
No abstract record available.
Inventors
- 👤 Charles H Rigby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:45
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A METHOD OF CONVERTING A FIBEROUS WATER SOLUBLE SODIUM SALT OF CARBOXYMETHYL CELLULOSE INTO A POWDERED FORM A RELATIVELY HIGH BULK DENSITY IN COMPARISON WITH THE BULK DENSITY REALIZED BY COMMINUTING SAID CARBOXYMETHYL CELLULOSE IN FIBEROUS FROM WHICH COMPRISES SUBJECTING A FIBEROUS WATER SOLUBLE SODIUM SALT OF CARBOXYMETHYL CELLULOSE WET WITH AN AQUEOUS SOLUTION OF A WATER MISCIBLE ALCOHOL IN WHICH SAID CARBOXYMETHYL CELLULOSE IS INSOLUBLE SO THAT THE FIBEROUS STRUCTURE OF SAID CARBOXYMETHYL CELLULOSE IS RETAINED IN SAID SOLUTION, WHICH ALCOHOL BOILS AT A BOILING POINT BELOW THE BOILING POINT OF WATER, TO ROLLER PRESSURE BETWEEN HARD SURFACES TO CAUSE SAID CARBOXYMETHYL CELLULOSE TO SPREAD UNDER THE PRESSURE AND FORM ELEMENTS OF A CONTINUOUS WEB OF AT LEAST INCIPIENTLY GELATINIZED MATERIAL, DRYING SAID WEB AND COMMINUTING THE RESULING HARD BRITTLE SHEET ELEMENTS TO A POWDERY PRODUCT.
Claim 2
Independent Claim
137 words
A METHOD OF CONVERTING A FIBEROUS WATER SOLUBLE SODIUM SALT OF CARBOXYMETHYL CELLULOSE INTO A POWDERED FORM A RELATIVELY HIGH BULK DENSITY IN COMPARISON WITH THE BULK DENSITY REALIZED BY COMMINUTING SAID CARBOXYMETHYL CELLULOSE IN FIBEROUS FROM WHICH COMPRISES SUBJECTING A FIBEROUS WATER SOLUBLE SODIUM SALT OF CARBOXYMETHYL CELLULOSE WET WITH AN AQUEOUS SOLUTION OF A WATER MISCIBLE ALCOHOL IN WHICH SAID CARBOXYMETHYL CELLULOSE IS INSOLUBLE SO THAT THE FIBEROUS STRUCTURE OF SAID CARBOXYMETHYL CELLULOSE IS RETAINED IN SAID SOLUTION, WHICH ALCOHOL BOILS AT A BOILING POINT BELOW THE BOILING POINT OF WATER, TO ROLLER PRESSURE BETWEEN HARD SURFACES TO CAUSE SAID CARBOXYMETHYL CELLULOSE TO SPREAD UNDER THE PRESSURE AND FORM ELEMENTS OF A CONTINUOUS WEB OF AT LEAST INCIPIENTLY GELATINIZED MATERIAL, DRYING SAID WEB AND COMMINUTING THE RESULING HARD BRITTLE SHEET ELEMENTS TO A POWDERY PRODUCT.
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |