Patent US3494880A successfully refreshed from Google Patents.
US3494880A
Expired / Lapsed
US
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Polyurethane foams prepared from stabilized polyether polyols
Assignee: Wyandotte Chemicals Corp
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Filing: 1969-01-23
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Granted: 1970-02-10
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Expires: 1989-01-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0023; C08G; C08G18/00; C08G18/06; C08G18/28; C08K; C08K5/00; C08K5/04; C08K5/13; C08J2375/00
Claims Analysis
Total Claims: 0
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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) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |