US2451533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing improved yarn
Assignee: Celanese Corp
•
Filing: 1945-10-17
•
Granted: 1948-10-19
•
Expires: 1965-10-17
Abstract
No abstract record available.
Inventors
- 👤 Cannon Paul Haven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:43
CPC Classifications
D; D02; D02G; D02G3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1193041A
Cited
US1038888A
Cited
GB115498A
Cited
GB153713A
Cited
FR642154A
Cited
GB297988A
Cited
US1969307A
Cited
US2058113A
Cited
US2345544A
Cited
US2363205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |