Patent US2824888A successfully refreshed from Google Patents.
US2824888A
Expired / Lapsed
US
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alpha, alpha-difluoro-substituted acids of the tricarboxylic acid cycle, their salts, amides and esters
Assignee: EIDP Inc
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Filing: 1955-09-20
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Granted: 1958-02-25
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Expires: 1975-09-20
Abstract
No abstract record available.
Inventors
- 👤 Maynard S Raasch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:27
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/235; C07C59/245; C07C59/295; C07C55/00; C07C55/32; C07C57/00; C07C57/52; C07C59/347
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A FLUORINE-CONTAINING COMPOUND SELECTED FROM THE CLASS CONSISTING OF ACIDS OF THE TRICARBOXYLIC ACID CYCLE HAVING A METHYLENE CARBON ATOM ALPHA TO A CARBOXYL GROUP AND HAVING DIRECTLY ATTACHED TO THIS METHYLENE CARBON ATOM TWO FLUORINE ATOMS, THEIR METAL AND AM MONIUM SALTS, THEIR ALKYL ESTERS WHEREIN THE ALKYL GROUP CONTAINS 1 TO 8 CARBON ATOMS, THEIR AMIDES AND THEIR N-ALKYL AND N-DIALKYL SUBSTITUTED AMIDES WHEREIN THE ALKYL GROUPS CONTAIN 1 TO 8 CARBON ATOMS.
Claim 2
Dependent Claim
75 words
A FLUORINE-CONTAINING COMPOUND SELECTED FROM THE CLASS CONSISTING OF ACIDS OF THE TRICARBOXYLIC ACID CYCLE HAVING A METHYLENE CARBON ATOM ALPHA TO A CARBOXYL GROUP AND HAVING DIRECTLY ATTACHED TO THIS METHYLENE CARBON ATOM TWO FLUORINE ATOMS, THEIR METAL AND AM MONIUM SALTS, THEIR ALKYL ESTERS WHEREIN THE ALKYL GROUP CONTAINS 1 TO 8 CARBON ATOMS, THEIR AMIDES AND THEIR N-ALKYL AND N-DIALKYL SUBSTITUTED AMIDES WHEREIN THE ALKYL GROUPS CONTAIN 1 TO 8 CARBON ATOMS.
References Cited (Backward Citations)
US2426224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |