US3706680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed polyurethanes prepared from diphenols and polyisocyanates
Assignee: Dow Chemical Co
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Filing: 1970-11-30
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Granted: 1972-12-19
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Expires: 1990-11-30
Abstract
Abstract THE INVENTION CONCERNS POLYURETHANES PREPARED FROM DIPHENOLS AND POLYISOCYANATES. IT RELATES MORE PARTICULARLY TO POLYURETHANE FOAMS OF DIPHENOLS AND POLYISOCYANATES.
Inventors
- 👤 Llewellyn Delphin Booth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:35
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3863; C08G18/32; C08G18/3203; C08G18/3215; C08G2110/00; C08G2110/0016; C08G2110/0025; C08G2110/0041; C08G2110/005
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |