Patent US2728631A successfully refreshed from Google Patents.
US2728631A
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Process for the production of crinkled polyacrylonitrile yarns
Assignee: Textile & Chemical Res Co
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Filing: 1953-02-20
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Granted: 1955-12-27
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Expires: 1973-02-20
Abstract
No abstract record available.
Inventors
- 👤 Drisch Nicolas
- 👤 Herrbach Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:50
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR THE PRODUCTION OF CRINKLED YARNS WHICH COMPRISES SPINING THROUGH SPINNERETS A SOLUTION IN A SOLVENT SELECTED FROM THE CLASS CONSISTING OF DIMETHYL AND DIETHYLFORMAMIDES OF AN ACRYLONITRILE POLYMER CONTAINING AT LEAST 85% OF ACRYLONITRILE INTO A SPINNING BATH AT 15* TO 40* C. THE SAID BATH CONSISTING OF 30-60% BY WEIGHT OF A SAID SOLVENT FOR THE SAID POLYMER, 10-30% BY WEIGHT OF CALCIUM CHLORIDE AND FROM 10-60% BY WEIGHT OF WATER, STRETCHING THE YARN CONTINUOUSLY WITH ITS PRODUCTION AND THEREAFTER WASHING THE YARN OBTAINED AND DRYING IT WITHOUT TENSION.
Claim 2
Dependent Claim
93 words
A PROCESS FOR THE PRODUCTION OF CRINKLED YARNS WHICH COMPRISES SPINING THROUGH SPINNERETS A SOLUTION IN A SOLVENT SELECTED FROM THE CLASS CONSISTING OF DIMETHYL AND DIETHYLFORMAMIDES OF AN ACRYLONITRILE POLYMER CONTAINING AT LEAST 85% OF ACRYLONITRILE INTO A SPINNING BATH AT 15* TO 40* C. THE SAID BATH CONSISTING OF 30-60% BY WEIGHT OF A SAID SOLVENT FOR THE SAID POLYMER, 10-30% BY WEIGHT OF CALCIUM CHLORIDE AND FROM 10-60% BY WEIGHT OF WATER, STRETCHING THE YARN CONTINUOUSLY WITH ITS PRODUCTION AND THEREAFTER WASHING THE YARN OBTAINED AND DRYING IT WITHOUT TENSION.
References Cited (Backward Citations)
US2451420A
Cited
US2577763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |