Patent US2677591A successfully refreshed from Google Patents.
US2677591A
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Removal of porosity in wet-spun acrylonitrile filaments by pressing against a hot surface
Assignee: EIDP Inc
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Filing: 1950-07-07
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Granted: 1954-05-04
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Expires: 1970-07-07
Abstract
No abstract record available.
Inventors
- 👤 Moody Frank Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:49
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; Y; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS OF CONVERTING A POROUS FILAMENTARY ARTICLE OF AN ACRYLONITRILE POLYMER CONTAINING A MAJOR PORTION OF ACRYLONITRILE TO A SUBTANTIALLY NON-POROUS CONDITION, WHICH COMPRISES SUBJECTING SAID ARTICLE WET WITH WATER TO LATERAL PRESSURE AGAINST A SOLID SURFACE AT A TEMPERATURE BELOW THE THERMAL DECOMPOSITION POINT OF SAID POLYMER AND AT LEAST 100* C. UNTIL SAID WATER IS REMOVED AND SAID ARTICLE IS SUBSTANTIALLY NONPOROUS.
Claim 2
Dependent Claim
65 words
A PROCESS OF CONVERTING A POROUS FILAMENTARY ARTICLE OF AN ACRYLONITRILE POLYMER CONTAINING A MAJOR PORTION OF ACRYLONITRILE TO A SUBTANTIALLY NON-POROUS CONDITION, WHICH COMPRISES SUBJECTING SAID ARTICLE WET WITH WATER TO LATERAL PRESSURE AGAINST A SOLID SURFACE AT A TEMPERATURE BELOW THE THERMAL DECOMPOSITION POINT OF SAID POLYMER AND AT LEAST 100* C. UNTIL SAID WATER IS REMOVED AND SAID ARTICLE IS SUBSTANTIALLY NONPOROUS.
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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) | 1957-05-03 | 1957-11-02 | 1958-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-03 | 1961-11-02 | 1962-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-03 | 1965-11-02 | 1966-05-04 | $7700.00 | Window Closed / Lapsed |