US3475377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spandex fibers based on segmented polyurethanes chain extended with two different chain extenders
Assignee: Bayer AG
•
Filing: 1965-12-06
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Granted: 1969-10-28
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Expires: 1985-12-06
Abstract
No abstract record available.
Inventors
- 👤 Friedrich Karl Rosendahl
- 👤 Wilhelm Thoma
- 👤 Harald Oertel
- 👤 Heinrich Rinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:28
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/0804; C08G18/0819; C08G18/0828; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2929804A
Cited
US3097192A
Cited
US3071557A
Cited
US3267192A
Cited
US3305533A
Cited
US3198863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |