US2768868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improving the dyeing uniformity and thermostability of undrawn acrylonitrile polymer filaments by applying steam under pressure
Assignee: EIDP Inc
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Filing: 1953-03-27
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Granted: 1956-10-30
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Expires: 1973-03-27
Abstract
No abstract record available.
Inventors
- 👤 Hewett James Veith
- 👤 Jr Lawrence Bell Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:50
CPC Classifications
D; D06; D06P; D06P5/00; D06P5/20; D06P5/2066; D06P5/2072; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38; D06M; D06M13/00; D06M13/10; D06M13/224; D06P5/2022; D06P5/2044; D06P5/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE PROCESS OF IMPROVING THE UNIFORMITY OF FILAMENTS WHICH HAVE NOT BEEN SUBJECTED TO A DRAWING OPERATION AND WHICH CONTAIN FROM 85% TO 100% POLYACRYLONITRILE AND FROM 0% TO 15% OF AN ACRYLATE ESTER COPOLYMERIZED THEREWITH, WHICH COMPRISES PLACING THE SAID FILAMENTS IN AN ATMOSPHERE OF STEAM UNDER A PRESSURE OF FROM 0 TO 40 LBS. PER SQ. INCH GAUGE FOR A TIME BETWEEN 5 AND 150 MINUTES.
Claim 2
Dependent Claim
68 words
THE PROCESS OF IMPROVING THE UNIFORMITY OF FILAMENTS WHICH HAVE NOT BEEN SUBJECTED TO A DRAWING OPERATION AND WHICH CONTAIN FROM 85% TO 100% POLYACRYLONITRILE AND FROM 0% TO 15% OF AN ACRYLATE ESTER COPOLYMERIZED THEREWITH, WHICH COMPRISES PLACING THE SAID FILAMENTS IN AN ATMOSPHERE OF STEAM UNDER A PRESSURE OF FROM 0 TO 40 LBS. PER SQ. INCH GAUGE FOR A TIME BETWEEN 5 AND 150 MINUTES.
References Cited (Backward Citations)
US2420565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |