US3471465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cellular polyurethanes in the presence of triethylene diamine and a siloxane-oxyalkylene block copolymer
Assignee: Bayer AG
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Filing: 1967-05-25
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Granted: 1969-10-07
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Expires: 1987-05-25
Abstract
No abstract record available.
Inventors
- 👤 Gunther Loew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:18
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2045; C08G18/2063; C08J2375/00; C08J2375/04; C08J2483/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE24514E
Cited
US2425755A
Cited
US2834748A
Cited
US2939851A
Cited
US2949431A
Cited
US3194773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |