Patent US2521807A successfully refreshed from Google Patents.
US2521807A
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Apparatus for treating with liquid running yarns and threads
Assignee: Celanese Corp
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Filing: 1945-07-31
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Granted: 1950-09-12
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Expires: 1965-07-31
Abstract
No abstract record available.
Inventors
- 👤 Frederick F Sutherland
- 👤 Donald K Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:30
CPC Classifications
D; D06; D06B; D06B3/00; D06B3/04; D06B3/06; D06B1/00; D06B1/10; D06B1/12; D06B15/00; D06B15/08; D06B15/085; D06B3/045; Y; Y10; Y10S; Y10S118/00; Y10S118/18
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) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |