US2662884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bleaching cellulose derivatives
Assignee: Hercules Powder Co
•
Filing: 1951-05-17
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Granted: 1953-12-15
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Expires: 1971-05-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Roy H Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:34
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
THE METHOD OF BLEACHING AND REMOVING COLOR BODIES FROM AN ORGANIC SOLVENT-INSOLUBLE CELLULOSE ESTER WHICH COMPRISES CONTACTING SLURRY OF SAID CELLULOSE ETHER IN AN INERT WATER MISCIBLE NONSOLVENT FOR SAID CELLULOSE ETHER WITH AN INORGANIC CHLORITE, SAID CHLORITE BEING ACTIVATED WITH AN INORGANIC HYPOCHLORITE WHEN THE PH OF SAID SLURRY IS NOT LOWER THAN 6.
Claim 2
Independent Claim
55 words
THE METHOD OF BLEACHING AND REMOVING COLOR BODIES FROM AN ORGANIC SOLVENT-INSOLUBLE CELLULOSE ESTER WHICH COMPRISES CONTACTING SLURRY OF SAID CELLULOSE ETHER IN AN INERT WATER MISCIBLE NONSOLVENT FOR SAID CELLULOSE ETHER WITH AN INORGANIC CHLORITE, SAID CHLORITE BEING ACTIVATED WITH AN INORGANIC HYPOCHLORITE WHEN THE PH OF SAID SLURRY IS NOT LOWER THAN 6.
References Cited (Backward Citations)
US1948517A
Cited
US2109509A
Cited
US2138757A
Cited
US2238192A
Cited
GB561834A
Cited
US2358866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |