US2835666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble thermoplastic cellulose ether
Assignee: Dow Chemical Co
•
Filing: 1954-05-27
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Granted: 1958-05-20
•
Expires: 1974-05-27
Abstract
No abstract record available.
Inventors
- 👤 Albert B Savage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:59
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE PROCESS WHICH COMPRISES SUBJECTING AN ALKALI CELLULOSE INITIALLY HAVING AN ALKALI TO CELLULOSE RATIO OF FROM 0.7 TO 1.5 TO THE ACTION OF FROM 0.15 TO 0.8 PART OF BUTYLENE OXIDE PER PART OF CELLULOSE, UNTIL THE OLEFIN OXIDE IS SUBSTANTIALLY FULLY REACTED, AND TO THE ACTION OF FROM 1.1 TO 2.0 PARTYS OF METHYL CHLORIDE PER PART OF CELLULOSE AT A TEMPERATURE FROM 40*C. TO 80*C. UNTIL THE ETHERIFICATION IS SUBSTANTIALLY COMPLETE, TO PRODUCE A HYDROXYBUTYL METHYL CELLULOSE WHICH IS BOTH COLD WATER-SOLUBLE AND THERMOPLASTIC.
Claim 2
Dependent Claim
87 words
THE PROCESS WHICH COMPRISES SUBJECTING AN ALKALI CELLULOSE INITIALLY HAVING AN ALKALI TO CELLULOSE RATIO OF FROM 0.7 TO 1.5 TO THE ACTION OF FROM 0.15 TO 0.8 PART OF BUTYLENE OXIDE PER PART OF CELLULOSE, UNTIL THE OLEFIN OXIDE IS SUBSTANTIALLY FULLY REACTED, AND TO THE ACTION OF FROM 1.1 TO 2.0 PARTYS OF METHYL CHLORIDE PER PART OF CELLULOSE AT A TEMPERATURE FROM 40*C. TO 80*C. UNTIL THE ETHERIFICATION IS SUBSTANTIALLY COMPLETE, TO PRODUCE A HYDROXYBUTYL METHYL CELLULOSE WHICH IS BOTH COLD WATER-SOLUBLE AND THERMOPLASTIC.
References Cited (Backward Citations)
US1877856A
Cited
US2033126A
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US2388764A
Cited
US2526683A
Cited
US2629667A
Cited
US2602755A
Cited
US2610180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |