Patent US3415768A successfully refreshed from Google Patents.
US3415768A
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US
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Polyurethanes prepared from chain-extenders having n-alkoxy methyl groups
Assignee: Bayer AG
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Filing: 1966-06-03
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Granted: 1968-12-10
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Expires: 1986-06-03
Abstract
No abstract record available.
Inventors
- 👤 Dieterich Dieter
- 👤 Keberle Wolfgang
- 👤 Muller Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3842; C08G18/08; C08G18/0804; C08G18/10; C08G18/3823
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2929800A
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US2850474A
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US3095385A
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US3121748A
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GB992373A
Cited
US3321415A
Cited
US3346517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |