Patent US4504519A successfully refreshed from Google Patents.
US2851453A
Expired / Lapsed
US
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Cellulose derivative product, compositions comprising the same and their preparation
Assignee: Smith Kline & French Laboratories Ltd
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Filing: 1954-08-09
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Granted: 1958-09-09
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Expires: 1974-08-09
Abstract
No abstract record available.
Inventors
- 👤 Kennon Lloyd
- 👤 Joseph V Swintosky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20; Y; Y10; Y10S; Y10S424/00; Y10S424/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
THE METHOD OF PREPARING A SOLID, ACID CARBOXYMETHYLCELLULOSE PRODUCT IN FINELY-DIVIDED, RELATIVELY UNIFORM PARTICLE SIZE FORM WHICH COMPRISES REPLACING AT LEAST ABOUT 80% OF THE ALKALI CATIONS OF AN AQUEOUS SOLUTION OF AN ALKALI SALT OF CARBOXYMETHYLCELLULOSE HAVING A DEGREE OF SUBSTITUTION OF AT LEAST ABOUT 0.3 WITH HYDROGEN IONS TO PROVIDE AN AQUEOUS DISPERSION OF AN ACID CARBOXYMETHYLCELLULOSE, ATOMIZING SAID AQUEOUS DISPERSION AS A MIST INTO A HOT GAS STREAM HAVING A TEMPERATURE OF AT LEAST 150*C., WHEREBY THE WATER ASSOCIATED WITH THE MIST DROPLETS ISVAPORIZED, AND SEPARATING THE RESULTING SOLID, FINELY-DIVIDED ACID CARBOXYMETHYLCELLULOSE HAVING A PARTICLE SIZE WITHIN THE RANGE BETWEEN ABOUT 0.5 TO ABOUT .20 MICRONS FROM THE GAS.
Claim 2
Independent Claim
112 words
THE METHOD OF PREPARING A SOLID, ACID CARBOXYMETHYLCELLULOSE PRODUCT IN FINELY-DIVIDED, RELATIVELY UNIFORM PARTICLE SIZE FORM WHICH COMPRISES REPLACING AT LEAST ABOUT 80% OF THE ALKALI CATIONS OF AN AQUEOUS SOLUTION OF AN ALKALI SALT OF CARBOXYMETHYLCELLULOSE HAVING A DEGREE OF SUBSTITUTION OF AT LEAST ABOUT 0.3 WITH HYDROGEN IONS TO PROVIDE AN AQUEOUS DISPERSION OF AN ACID CARBOXYMETHYLCELLULOSE, ATOMIZING SAID AQUEOUS DISPERSION AS A MIST INTO A HOT GAS STREAM HAVING A TEMPERATURE OF AT LEAST 150*C., WHEREBY THE WATER ASSOCIATED WITH THE MIST DROPLETS ISVAPORIZED, AND SEPARATING THE RESULTING SOLID, FINELY-DIVIDED ACID CARBOXYMETHYLCELLULOSE HAVING A PARTICLE SIZE WITHIN THE RANGE BETWEEN ABOUT 0.5 TO ABOUT .20 MICRONS FROM THE GAS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |