Patent US2539438A successfully refreshed from Google Patents.
US2539438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerized unsaturated tetrafluorosuccinate ester
Assignee: Wyeth Holdings LLC
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Filing: 1947-04-01
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Granted: 1951-01-30
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Expires: 1967-04-01
Abstract
No abstract record available.
Inventors
- 👤 Edward L Kropa
- 👤 John J Padbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:59
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A COMPOSITION COMPRISING THE PRODUCT OF POLYMERIZATION OF A POLYMERIZABLE MASS INCLUDING A TETRAFLUOROSUCCINIC ESTER OF A PRIMARY, ETHYLENICALLY UNSATURATED MONOHYDRIC ALCOHOL CONTAINING AT LEAST 3 AND NOT MORE THAN 10 CARBON ATOMS AND IN WHICH THE HYDROXY GROUP IS BONDED THROUGH CARBON TO A MONOVALENT, ETHYLENICALLY UNSATURATED ALIPHATIC, HYDROCARBON GROUPING.
Claim 2
Dependent Claim
51 words
A COMPOSITION COMPRISING THE PRODUCT OF POLYMERIZATION OF A POLYMERIZABLE MASS INCLUDING A TETRAFLUOROSUCCINIC ESTER OF A PRIMARY, ETHYLENICALLY UNSATURATED MONOHYDRIC ALCOHOL CONTAINING AT LEAST 3 AND NOT MORE THAN 10 CARBON ATOMS AND IN WHICH THE HYDROXY GROUP IS BONDED THROUGH CARBON TO A MONOVALENT, ETHYLENICALLY UNSATURATED ALIPHATIC, HYDROCARBON GROUPING.
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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) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |