Patent US1889437A successfully refreshed from Google Patents.
Patent US2957031A successfully refreshed from Google Patents.
US2957031A
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Selected fluoroalkyl aromatic compounds and their preparation
Assignee: EIDP Inc
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Filing: 1958-06-16
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Granted: 1960-10-18
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Expires: 1978-06-16
Abstract
No abstract record available.
Inventors
- 👤 John J Drysdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:48
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/20; C07C43/225; C07C17/00; C07C17/26; C07C17/32; C07C22/00; C07C22/02; C07C22/04; C07C22/08; C07C41/00; C07C41/01; C07C41/18; C07C41/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
A COMPOUND OF THE FORMULA XRFAR, WHEREIN X IS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, CHLORINE AND FLUORINE, RF IS A PERFLUOROALKYLENE RADICAL CONTAINING AT LEAST 8 CARBONS, AND AR IS A MONOVALENT AROMATIC RADICAL HYDROCARBON EXCEPT FOR A SINGLE SUBSTITUENT, SAID SUBSTITUENT BEING SELECTED FROM THE CLASS CONSISTING OF HALOGEN, LOWER ALKOXY, AND PERFLUOROALKYL AND OMEGAHYDROPERFLUOROALKYL RADICALS OF 1-24 CARBONS.
References Cited (Backward Citations)
US2862974A
Cited
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 |