Patent US3202747A successfully refreshed from Google Patents.
US3202747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for crimping wet spun cellulose triacetate
Assignee: Celanese Corp
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Filing: 1961-04-26
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Granted: 1965-08-24
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Expires: 1981-04-26
Abstract
No abstract record available.
Inventors
- 👤 John W Soehngen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:30
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22; D01F; D01F2/00; D01F2/24; D01F2/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
PROCESS FOR THE PRODUCTION OF CRIMPED FILAMENTARY MATERIALS OF CELLULOSE TRIACETATE, WHICH COMPRISES EXTRUDING A SOLUTION OF CELLULOSE TRIACETATE, DISSOLVED IN AN ORGANIC SOLVENT THEREFOR COMPRISING PRINCIPALLY METHYLENE CHLORIDE, INTO A MIXTURE OF METHYLENE CHLORIDE AND A LOWER ALKANOL AS LIQUID COAGULANT TO PRODUCE A BUNDLE OF PARALLEL FILAMENTS SWOLLEN BY COAGULANT, SEPARATING INDIVIDUAL FILAMENTS FROM ONE ANOTHER BY PASSING THEM TOGETHER WITH A PRESSURIZED GAS THROUGH A VENTURI-SHAPED ZONE WHILE SAID FILAMENTS ARE STILL MAINTAINED IN SUBSTANTIALLY PARALLEL RELATION, AND REMOVING THE SWELLING LIQUID FROM SAID FILAMENTS WHILE MAINTAINING SAID FILAMENTS IN SUBSTANTIALLY SEPARATED AND TENSIONLESS CONDITION UNTIL SAID FILAMENTS ARE IN SUBSTANTIALLY NON-SWOLLEN CONDITION, SAID FILAMENTS CRIMPING DURING SAID REMOVAL OF SWELLING LIQUID.
Claim 2
Dependent Claim
115 words
PROCESS FOR THE PRODUCTION OF CRIMPED FILAMENTARY MATERIALS OF CELLULOSE TRIACETATE, WHICH COMPRISES EXTRUDING A SOLUTION OF CELLULOSE TRIACETATE, DISSOLVED IN AN ORGANIC SOLVENT THEREFOR COMPRISING PRINCIPALLY METHYLENE CHLORIDE, INTO A MIXTURE OF METHYLENE CHLORIDE AND A LOWER ALKANOL AS LIQUID COAGULANT TO PRODUCE A BUNDLE OF PARALLEL FILAMENTS SWOLLEN BY COAGULANT, SEPARATING INDIVIDUAL FILAMENTS FROM ONE ANOTHER BY PASSING THEM TOGETHER WITH A PRESSURIZED GAS THROUGH A VENTURI-SHAPED ZONE WHILE SAID FILAMENTS ARE STILL MAINTAINED IN SUBSTANTIALLY PARALLEL RELATION, AND REMOVING THE SWELLING LIQUID FROM SAID FILAMENTS WHILE MAINTAINING SAID FILAMENTS IN SUBSTANTIALLY SEPARATED AND TENSIONLESS CONDITION UNTIL SAID FILAMENTS ARE IN SUBSTANTIALLY NON-SWOLLEN CONDITION, SAID FILAMENTS CRIMPING DURING SAID REMOVAL OF SWELLING LIQUID.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |