Patent US2746958A successfully refreshed from Google Patents.
US2746958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose derivatives and their method of preparation
Assignee: Hercules Powder Co
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Filing: 1951-05-17
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Granted: 1956-05-22
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Expires: 1971-05-17
Abstract
No abstract record available.
Inventors
- 👤 George H Pyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:21
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
THE METHOD FOR REMOVING COLOR BODIES FROM AN OGANIC SOLVENT-SOLUBLE CELLULOSE GROUPS IN SAID CELLULOSE LINE ATTACHED TO FUNCTIONAL GROUPS IN SAID CELLULOSE OTHER WHICH COMPRISES CONTACTING SAID CELLULOSE ETHER WITH AN INORGANIC CHLORITE BLEACHING AGENT IN THE PRESENCE OF AN AQUEOUS SWELLING MEDIUM FOR SAID CELLULOSE ETHER.
Claim 2
Independent Claim
48 words
THE METHOD FOR REMOVING COLOR BODIES FROM AN OGANIC SOLVENT-SOLUBLE CELLULOSE GROUPS IN SAID CELLULOSE LINE ATTACHED TO FUNCTIONAL GROUPS IN SAID CELLULOSE OTHER WHICH COMPRISES CONTACTING SAID CELLULOSE ETHER WITH AN INORGANIC CHLORITE BLEACHING AGENT IN THE PRESENCE OF AN AQUEOUS SWELLING MEDIUM FOR SAID CELLULOSE ETHER.
References Cited (Backward Citations)
US2138757A
Cited
US2238912A
Cited
GB561834A
Cited
US2358866A
Cited
US2535290A
Cited
US2535360A
Cited
US2662884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |