Patent US2889379A successfully refreshed from Google Patents.
US2889379A
Expired / Lapsed
US
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Preparation of 3, 3, 3-trifluoropropene
Assignee: Dow Chemical Co
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Filing: 1957-02-06
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Granted: 1959-06-02
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Expires: 1977-02-06
Abstract
No abstract record available.
Inventors
- 👤 Robert P Ruh
- 👤 Robert A Stowe
- 👤 Ralph A Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:54
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR THE PREPARATION OF 3,3,3-TRIFLUOROPROPENE WHICH COMPRISES: CONTACTING HYDROGEN FLUORIDE AND A THREE CARBON ATOM HALOGENATED HYDROCARBON CONTAINING FROM 3 TO 4 HYDROGEN ATOMS AND FROM 3 TO 4 HALOGEN ATOMS OTHER THAN IODINE, NOT MORE THAN TWO OF WHICH ARE FLUORINE, ONE TERMINAL CARBON ATOM CONTAINING NO HYDROGEN THEREON, SAID CONTACTING BEING FOR A CONTACT TIME OF AT LEAST 0.5 SECOND, AT A TEMPERATURE ABOVE 150 DEGREES CENTIGRADE, IN THE PRESENCE OF A CHROMIUM OXLYFLUORIDE CATALYST, AND AT A MOLE RATIO OF AT LEAST 3.0 TO 1.0 HYDROGEN FLUORIDE TO ORGANIC; AND, SEPARATING 3,3,3-TRIFLUOROPROPENE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
101 words
A PROCESS FOR THE PREPARATION OF 3,3,3-TRIFLUOROPROPENE WHICH COMPRISES: CONTACTING HYDROGEN FLUORIDE AND A THREE CARBON ATOM HALOGENATED HYDROCARBON CONTAINING FROM 3 TO 4 HYDROGEN ATOMS AND FROM 3 TO 4 HALOGEN ATOMS OTHER THAN IODINE, NOT MORE THAN TWO OF WHICH ARE FLUORINE, ONE TERMINAL CARBON ATOM CONTAINING NO HYDROGEN THEREON, SAID CONTACTING BEING FOR A CONTACT TIME OF AT LEAST 0.5 SECOND, AT A TEMPERATURE ABOVE 150 DEGREES CENTIGRADE, IN THE PRESENCE OF A CHROMIUM OXLYFLUORIDE CATALYST, AND AT A MOLE RATIO OF AT LEAST 3.0 TO 1.0 HYDROGEN FLUORIDE TO ORGANIC; AND, SEPARATING 3,3,3-TRIFLUOROPROPENE FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2787646A
Cited
US2745886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |