Patent US3073670A successfully refreshed from Google Patents.
US3073670A
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Process for the wet-spinning of acrylonitrile polymers
Assignee: SINIA VISCOSA NAZ IND Soc
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Filing: 1961-07-10
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Granted: 1963-01-15
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Expires: 1981-07-10
Abstract
No abstract record available.
Inventors
- 👤 Notarbatolo Luigi
- 👤 Pasin Alberto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:07
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F13/00; D01F13/04; Y; Y02; Y02P; Y02P70/00; Y02P70/50; Y02P70/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A WET-SPINNING PROCESS FOR THE MANUFACTURE OF FILAMENTS OF ACRYLONITRILE POLYMERS, COMPRISING THE STEPS OF EXTRUDING A SOLUTION OF A POLYMER OF ACRYLONITRILE IN AN ORGANIC SOLVENT INTO A COAGULATING BATH AND THEREAFTER STRETCHING THE RESULTING FILAMENTS IN A STRETCHING BATH BOTH BATHS COMPRISING ESSENTIALLY AQUEOUS SOLUTIONS CONTAINING FROM 30 TO 75% BY WEIGHT OF POTASSIUM FORMATE.
Claim 2
Dependent Claim
57 words
A WET-SPINNING PROCESS FOR THE MANUFACTURE OF FILAMENTS OF ACRYLONITRILE POLYMERS, COMPRISING THE STEPS OF EXTRUDING A SOLUTION OF A POLYMER OF ACRYLONITRILE IN AN ORGANIC SOLVENT INTO A COAGULATING BATH AND THEREAFTER STRETCHING THE RESULTING FILAMENTS IN A STRETCHING BATH BOTH BATHS COMPRISING ESSENTIALLY AQUEOUS SOLUTIONS CONTAINING FROM 30 TO 75% BY WEIGHT OF POTASSIUM FORMATE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |