Patent US2956308A successfully refreshed from Google Patents.
US2956308A
Expired / Lapsed
US
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Chemical treatment of shaped polymeric articles
Assignee: Eastman Kodak Co
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Filing: 1958-05-21
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Granted: 1960-10-18
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Expires: 1978-05-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Roger M Schulken
- 👤 Long Harmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:44
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/04; D01F11/08; Y; Y10; Y10S; Y10S264/00; Y10S264/73; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
A PROCESS OF FORMING SHAPED ARTICLES FROM NONHEAT-SETTING SULFONE-DIOL POLYMERS WHICH COMPRISES DISSOLVING THE POLYMER IN A TRIFLUORO ACETIC ACID SOLVENT, FORMING A SHAPED ARTICLE FROM THE SOLUTION, REMOVING THE TRIFLUORO ACETIC ACID SOLVENT, SUBJECTING THE SUBSTANTIALLY SOLVENT FREE ARTICLE TO HEATING AT ABOUT 22-230*C., STRETCHING THE ARTICLE AT A TEMPERATURE WITHIN THE RANGE 135-190*C. AND THEN SETTING THE STRETCHED SHAPED ARTICLE IN ACETONE.
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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |