US2479644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conditioning agent
Assignee: Celanese Corp
•
Filing: 1947-03-29
•
Granted: 1949-08-23
•
Expires: 1967-03-29
Abstract
No abstract record available.
Inventors
- 👤 George W Seymour
- 👤 Duke Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:10
CPC Classifications
D; D06; D06M; D06M7/00; D06M2200/00; D06M2200/40; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2965
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2139276A
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US2245412A
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US2205042A
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US2268141A
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US2191033A
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US2182323A
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US2278747A
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US2406408A
Cited
US2407105A
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US2406407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |