US3728293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane compositions containing phenol-aldehyde resins and polyether polyols
Assignee: Dow Chemical Co
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Filing: 1972-03-13
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Granted: 1973-04-17
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Expires: 1992-03-13
Abstract
Abstract THE INVENTION CONCERNS NON-CELLULAR POLYURETHANE COMPOSITIONS DERIVED FROM ACID CATALYZED PHENOL-ALDEHYDE RESINS (NOVOLACS) ANDPOLISOCYANATES. IT RELATES MORE PARTICULARLY TO NON-CELLULAR POLYURETHANE COMPOSITIONS DERIVED FROM POLYETHER POLYOLS, NOVOLAC RESINS AND POLYISOCYANATES.
Inventors
- 👤 L Booth
- 👤 K Hinze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:29
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/54; C08G18/542; C08G18/08; C08G18/10; C08G18/4009; C08G18/4027
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |