US2902478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxyalkylation of solid polyols
Assignee: Dow Chemical Co
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Filing: 1957-05-09
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Granted: 1959-09-01
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Expires: 1977-05-09
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:23
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/02; C07H15/04; C07H15/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS FOR OXYETHYLATING SUCROSE COMPRISING CONTACTING SOLID SUCROSE WITH AT LEAST 8 MOLAR EQUIVALENTS OF ETHYLENE OXIDE IN THE PRESENCE OF A CATALYTIC AMOUNT OF TRIMETHYLAMINE AT A TEMPERATURE OF ABOUT 80 TO 150* C. AND A PRESSURE SUFFICIENT TO MAINTAIN THE ETHYLENE OXIDE IN THE LIQUID UNTIL SUBSTANTIALLY EVERY HYDROXYL GROUP OF THE SUCROSE HAS BEEN OXYALKYLATED.
Claim 2
Dependent Claim
59 words
A PROCESS FOR OXYETHYLATING SUCROSE COMPRISING CONTACTING SOLID SUCROSE WITH AT LEAST 8 MOLAR EQUIVALENTS OF ETHYLENE OXIDE IN THE PRESENCE OF A CATALYTIC AMOUNT OF TRIMETHYLAMINE AT A TEMPERATURE OF ABOUT 80 TO 150* C. AND A PRESSURE SUFFICIENT TO MAINTAIN THE ETHYLENE OXIDE IN THE LIQUID UNTIL SUBSTANTIALLY EVERY HYDROXYL GROUP OF THE SUCROSE HAS BEEN OXYALKYLATED.
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) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |