Patent US2645556A successfully refreshed from Google Patents.
US2645556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of artificial filaments
Assignee: Akzo Nobel UK PLC
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Filing: 1952-06-04
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Granted: 1953-07-14
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Expires: 1972-06-04
Abstract
No abstract record available.
Inventors
- 👤 Bashford Leslie Arthur
- 👤 Doubleday George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:41
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A PROCESS FOR THE PRODUCTION OF POLYACRYLONITRILE THREADS WHICH INCLUDES THE STEP OF EXTRUDING A SOLUTION OF POLYACRYLONITRILE IN DIMETHYL FORMAMIDE INTO AN AQUEOUS COAGULATING BATH CONTAINING POTASSIUM ACETATE IN A CONCENTRATION OF FROM 20 PER CENT BY WEIGHT UP TO SATURATION POINT.
Claim 2
Dependent Claim
43 words
A PROCESS FOR THE PRODUCTION OF POLYACRYLONITRILE THREADS WHICH INCLUDES THE STEP OF EXTRUDING A SOLUTION OF POLYACRYLONITRILE IN DIMETHYL FORMAMIDE INTO AN AQUEOUS COAGULATING BATH CONTAINING POTASSIUM ACETATE IN A CONCENTRATION OF FROM 20 PER CENT BY WEIGHT UP TO SATURATION POINT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |