US2838792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of filaments
Assignee: Celanese Corp
•
Filing: 1952-11-20
•
Granted: 1958-06-17
•
Expires: 1972-11-20
Abstract
No abstract record available.
Inventors
- 👤 Albert W Keight
- 👤 Robert T Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:16
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/06; D01D1/065; B; B01; B01F; B01F35/00; B01F35/20; B01F35/22; B01F35/2201; B01F35/2209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1284662A
Cited
US1680750A
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US1955825A
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US2039708A
Cited
US2136201A
Cited
US2445540A
Cited
US2650168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |