Patent US3104938A successfully refreshed from Google Patents.
US3104938A
Expired / Lapsed
US
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Process of producing shaped structures from an acrylonitrile polymerization product
Assignee: Wyeth Holdings LLC
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Filing: 1961-12-18
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Granted: 1963-09-24
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Expires: 1981-12-18
Abstract
No abstract record available.
Inventors
- 👤 Kocay Witold Roman
- 👤 Preece Jack Wherry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:13
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS OF PRODUCING SHAPED STRUCTURES FROM AN ACRYLONITRILE POLYMERIZATION PRODUCT COMPRISING EXTRUDING A SPINNING SOLUTION THEREOF INTO A COAGULATING MEDIUM; WASHING THE THUS FRESHLY FORMED GEL STRUCTURE SUBSTANTIALLY FREE OF CONTAMINATING IMPURITIES; IRREVERSIBLY STRETCHING THE THUS WASHED WET GEL STRUCTURE IN A FIRST AQUEOUS BATH MAINTAINED AT A TEMPERATURE OF ABOUT 40* C. TO ABOUT 90*C.; AND FURTHER IRREVERSIBLE STRETCHING THE THUS STRETCHED WET GEL STRUCTURE IN A SECOND AQUEOUS BATH MAINTAINED AT A TEMPERATURE OF ABOUT 95*C. TO ABOUT 100*C.
Claim 2
Dependent Claim
82 words
A PROCESS OF PRODUCING SHAPED STRUCTURES FROM AN ACRYLONITRILE POLYMERIZATION PRODUCT COMPRISING EXTRUDING A SPINNING SOLUTION THEREOF INTO A COAGULATING MEDIUM; WASHING THE THUS FRESHLY FORMED GEL STRUCTURE SUBSTANTIALLY FREE OF CONTAMINATING IMPURITIES; IRREVERSIBLY STRETCHING THE THUS WASHED WET GEL STRUCTURE IN A FIRST AQUEOUS BATH MAINTAINED AT A TEMPERATURE OF ABOUT 40* C. TO ABOUT 90*C.; AND FURTHER IRREVERSIBLE STRETCHING THE THUS STRETCHED WET GEL STRUCTURE IN A SECOND AQUEOUS BATH MAINTAINED AT A TEMPERATURE OF ABOUT 95*C. TO ABOUT 100*C.
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) | 1966-09-23 | 1967-03-25 | 1967-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-23 | 1971-03-25 | 1971-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-23 | 1975-03-25 | 1975-09-24 | $7700.00 | Window Closed / Lapsed |