US3721665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starch based polyether polyols
Assignee: Dow Chemical Co
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Filing: 1971-10-07
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Granted: 1973-03-20
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Expires: 1991-10-07
Abstract
Abstract A STARCH BASED POLYOL FOR POLYURETHANES IS DESCRIBED WHICH IS MADE BY REACTING CORNSTARCH WITH GLYCOL ETHERS AND ALKOXYLATING THE RESULTING REACTION PRODUCT.
Inventors
- 👤 P Moss
- 👤 M Cuscurida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:34
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4883; C08B; C08B31/00; C08B31/08
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |