US2686207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Difluoro compounds
Assignee: Bridgestone Firestone Inc
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Filing: 1949-12-31
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Granted: 1954-08-10
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Expires: 1969-12-31
Abstract
No abstract record available.
Inventors
- 👤 Crane Grant
- 👤 William S Barnhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:40
CPC Classifications
C; C07; C07C; C07C21/00; C07C21/02; C07C21/19; C07C21/20; C07C17/00; C07C17/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
THE PROCESS OF PRODUCING A 1,1-DIFLUORO-1,3DIOLEFIN WHICH COMPRISES DEHYDROBROMINATING BY AN ALKALINE REAGENT AND THUS REMOVING BROMINE FROM THE 3-CARBON ATOM OF A COMPOUND HAVING THE FROMULA XCF2-CHR-CHBR-CH2R'' IN WHICH X IS A HALOGEN OF THE CLASS CONSISTING OF CHLORINE AND BROMINE, R AND R'' ARE EACH FROM THE CLASS CONSISTING OF HYDROGEN, ALKYL AND CHLOROALKYL, AND CH2R'' CONTAINS AT LEAST AS MANY CARBON ATOMS AS R BUT NO MORE THAN TWELVE, SAID ALKALINE REAGENT BEING FROM THE CLASS CONSISTING OF ALKALI METAL HYDROXIDES, ALKALINE EARTH METAL HYDROXIDES, LIME AND ORGANIC BASES; AND THEN BY ACID CATALYSIS DEHYDROHALOGENATING TO PRODUCE THE DIFLUORO-DIOLEFIN, USING IN SAID ACID CATALYSIS A CATALYST OF THE CLASS CONSISTING OF PHOSPHOTUNGSTIC ACID, PHOSPHOMOLYBDIC ACID, AND SALTS OF STRONG ACIDS AND WEAK BASES.
Claim 2
Dependent Claim
126 words
THE PROCESS OF PRODUCING A 1,1-DIFLUORO-1,3DIOLEFIN WHICH COMPRISES DEHYDROBROMINATING BY AN ALKALINE REAGENT AND THUS REMOVING BROMINE FROM THE 3-CARBON ATOM OF A COMPOUND HAVING THE FROMULA XCF2-CHR-CHBR-CH2R'' IN WHICH X IS A HALOGEN OF THE CLASS CONSISTING OF CHLORINE AND BROMINE, R AND R'' ARE EACH FROM THE CLASS CONSISTING OF HYDROGEN, ALKYL AND CHLOROALKYL, AND CH2R'' CONTAINS AT LEAST AS MANY CARBON ATOMS AS R BUT NO MORE THAN TWELVE, SAID ALKALINE REAGENT BEING FROM THE CLASS CONSISTING OF ALKALI METAL HYDROXIDES, ALKALINE EARTH METAL HYDROXIDES, LIME AND ORGANIC BASES; AND THEN BY ACID CATALYSIS DEHYDROHALOGENATING TO PRODUCE THE DIFLUORO-DIOLEFIN, USING IN SAID ACID CATALYSIS A CATALYST OF THE CLASS CONSISTING OF PHOSPHOTUNGSTIC ACID, PHOSPHOMOLYBDIC ACID, AND SALTS OF STRONG ACIDS AND WEAK BASES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |