Patent US2858228A successfully refreshed from Google Patents.
US2858228A
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Preparation of spinning solutions
Assignee: Celanese Corp
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Filing: 1956-09-04
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Granted: 1958-10-28
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Expires: 1976-09-04
Abstract
No abstract record available.
Inventors
- 👤 Harold K Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:26
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/093; C08J2301/00; C08J2301/08; C08J2301/10; C08J2301/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
PROCESS FOR THE PREPARATION OF CLEAR SOLUTIONS OF CELLULOSE ACETATE HAVING AN ACETYL VALUE ABOVE ABOUT 58% DISSOLVED IN A SOLVENT, WHICH COMPRISES FORMING A SOLUTION CONSISTING ESSENTIALLY OF THE CELLULOSE ACETATE IN A SOLVENT OF THE CLASS CONSISTING OF METHYLENE CHLORIDE AND MIXTURES OF METHYLENE CHLORIDE AND LOWER ALIPHATIC ALCOHOLS, HEATING THE SOLUTION TO A TEMPERATURE ABOVE ABOUT 55*C., THE HEATING BEING CONTINUED FOR A TIME SUFFICIENT TO INCREASE THE FILTERABILITY AND SPINNABILITY OF THE RESULTING SOLUTION, AS COMPARED, UNDER IDENTICAL CONDITIONS, WITH AN OTHERWISE IDENTICAL SOLUTION PREPARED WITHOUT SUCH HEATING, COOLING THE SOLUTION AND FILTERING THE COOLED SOLUTION.
Claim 2
Dependent Claim
100 words
PROCESS FOR THE PREPARATION OF CLEAR SOLUTIONS OF CELLULOSE ACETATE HAVING AN ACETYL VALUE ABOVE ABOUT 58% DISSOLVED IN A SOLVENT, WHICH COMPRISES FORMING A SOLUTION CONSISTING ESSENTIALLY OF THE CELLULOSE ACETATE IN A SOLVENT OF THE CLASS CONSISTING OF METHYLENE CHLORIDE AND MIXTURES OF METHYLENE CHLORIDE AND LOWER ALIPHATIC ALCOHOLS, HEATING THE SOLUTION TO A TEMPERATURE ABOVE ABOUT 55*C., THE HEATING BEING CONTINUED FOR A TIME SUFFICIENT TO INCREASE THE FILTERABILITY AND SPINNABILITY OF THE RESULTING SOLUTION, AS COMPARED, UNDER IDENTICAL CONDITIONS, WITH AN OTHERWISE IDENTICAL SOLUTION PREPARED WITHOUT SUCH HEATING, COOLING THE SOLUTION AND FILTERING THE COOLED SOLUTION.
References Cited (Backward Citations)
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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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |