Patent US2557256A successfully refreshed from Google Patents.
US2557256A
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Linear polymeric hydroxy keto esters and process for preparing same
Assignee: EIDP Inc
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Filing: 1949-06-04
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Granted: 1951-06-19
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Expires: 1969-06-04
Abstract
No abstract record available.
Inventors
- 👤 Merlin M Brubaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:46
CPC Classifications
C; C08; C08G; C08G67/00; C08G67/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
83 words
A LINEAR POLYMERIC HYDROXY KETO ESTER, HAVING A MOLECULAR WEIGHT OF AT LEAST 500, FORMED FROM A SUBSTANCE OF THE CLASS OF ALKANOLS AND ALKYL FORMATES, AND COMONOMERS CONSISTING OF CARBON MONOXIDE AND A POLYMERIZABLE HYDROCARBON CONTAINING ETHYLENIC UNSATURATION, SAID HYDROCARBON CONTAINING ETHYLENIC UNSATURATION BEING ONE WHICH UNDERGOES ADDITION POLYMERIZATION ACROSS THE C=C GROUP WHEN SUBJECTED TO THE POLYMERIZING ACTION OF A PEROXY COMPOUND, SAID POLYHYDROXY KETO ESTER BEING CHARACTERIZED IN THAT IT HAS A POLYKETONE STRUCTURE, WITH RECURRING GROUPS FORMING AN INTEGRAL
References Cited (Backward Citations)
US2262817A
Cited
US2484501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |