Patent US2439829A successfully refreshed from Google Patents.
US2439829A
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US
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Method of producing artificial yarn
Assignee: EIDP Inc
•
Filing: 1943-08-19
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Granted: 1948-04-20
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Expires: 1963-08-19
Abstract
No abstract record available.
Inventors
- 👤 Emerson A Tippetts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:13
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/225; D01; D01D; D01D5/00; D01D5/12; D01D5/16; D01F; D01F2/00; D01F2/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2184144A
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US2074022A
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US2209841A
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US2252389A
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US2174576A
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US2265984A
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US2346696A
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US2309072A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |