US2882257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester film of 2-butene-1, 4-diol and methyl vinyl ether-maleic anhydride copolymer crosslinked with n-vinyl-2-pyrrolidone and process for preparing same
Assignee: GAF Chemicals Corp
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Filing: 1957-04-19
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Granted: 1959-04-14
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Expires: 1977-04-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Hessel
- 👤 Robinson Geraid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:10
CPC Classifications
C; C09; C09D; C09D167/00; C09D167/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A DRY CROSS-LINKED COPOLYNERIC POLYESTER FILM OBTAINED BY CASTING A FILM FROM AN AQUEOUS MIXTURE COMPRISING 1 MOLE OF METHYL VINYL ETHER-MALEIC ANHYDRIDE COPOLYMER HAVING A K VALUE FROM 10 TO 200, 1 MOLE OF 2-BUTENE-1,4-DIOL AND 1/2 MOLE OF N-VINYL-2-PYRROLIDONE AND HEATING THE CAST FILM TO A TEMPERATURE OF 130* TO 210* C. UNTIL A DRY FILM OF THE SAID POLYESTER IS OBTAINED.
Claim 2
Dependent Claim
64 words
A DRY CROSS-LINKED COPOLYNERIC POLYESTER FILM OBTAINED BY CASTING A FILM FROM AN AQUEOUS MIXTURE COMPRISING 1 MOLE OF METHYL VINYL ETHER-MALEIC ANHYDRIDE COPOLYMER HAVING A K VALUE FROM 10 TO 200, 1 MOLE OF 2-BUTENE-1,4-DIOL AND 1/2 MOLE OF N-VINYL-2-PYRROLIDONE AND HEATING THE CAST FILM TO A TEMPERATURE OF 130* TO 210* C. UNTIL A DRY FILM OF THE SAID POLYESTER IS OBTAINED.
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) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |