US3536668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyurethane fibers
Assignee: Bayer AG
•
Filing: 1968-05-28
•
Granted: 1970-10-27
•
Expires: 1988-05-28
Abstract
No abstract record available.
Inventors
- 👤 Horst Wieden
- 👤 Wilhelm Brenschede
- 👤 Hans Lenz
- 👤 Wolfgang Rellensmann
- 👤 Gunther Nischk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:03
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/721; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/42; D; D01; D01F; D01F6/00; D01F6/58; D01F6/70; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3097192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |