US3428610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes prepared from aromatic amines having alkyl groups in the ortho positions to the amine groups
Assignee: Bayer AG
•
Filing: 1966-05-10
•
Granted: 1969-02-18
•
Expires: 1986-05-10
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang Klebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/903; Y10S528/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2929800A
Cited
US2929804A
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US2888439A
Cited
GB869562A
Cited
US3105062A
Cited
US3188302A
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DE1131398B
Cited
US3194793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |