US3686101A
Expired / Lapsed
US
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Polyurethane foams of organic polyisocyanates and polyols derived from alkylene diamines and novolac resins and method of making same
Assignee: Dow Chemical Co
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Filing: 1970-02-24
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Granted: 1972-08-22
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Expires: 1990-02-24
Abstract
Abstract THE INVENTION CONCERNS POLYURETHANE FOAM PREPARED FROM ORGANIC POLYISOCYANATES AND A MIXTURE OF POLYETHER POLYOLS DERIVED FROM (A) ALKYLENE DIAMINES AND ALKYLENE OXIDES AND (B) NOVOLAC RESINS AND ALKYLENE OXIDES, AND PERTAINS TO A METHOD OF MAKING THE POLYURETHANE FOAMS.
Inventors
- 👤 Billy D Davis
- 👤 Elvis E Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:39
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/54; C08G18/546
Claims Analysis
Total Claims: 0
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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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |