US3399247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cellular polyurethane
Assignee: Bayer AG
•
Filing: 1966-07-18
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Granted: 1968-08-27
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Expires: 1986-07-18
Abstract
No abstract record available.
Inventors
- 👤 Windemuth Erwin
- 👤 Braun Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3893; C08G18/40; C08G18/61; C08G77/00; C08G77/42; C08G77/46; C08G2110/00; C08G2110/0008; C08G2110/0016; C08G2110/0025; C08G2110/0083; C08J2375/00; C08J2375/04; C08J2375/08; C08J2483/00
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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |