US2996555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2, 3, 3, 3-tetrafluoropropene
Assignee: Dow Chemical Co
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Filing: 1959-06-25
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Granted: 1961-08-15
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Expires: 1979-06-25
Abstract
No abstract record available.
Inventors
- 👤 Douglas A Rausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:55
CPC Classifications
C; C07; C07C; C07C17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR THE PREPARATION OF 2,3,3,3-TETRAFLUOROPROPENE WHICH COMPRISES: CONTACTING HYDROGEN FLUORIDE WITH A THREE CARBON ATOM HALOHYDROCARBON REPRESENTED BY THE FORMULA CX3CF2CH3, WHEREIN X IS SELECTED FROM THE GROUP CONSISTING OF, THE HALOGENS BROMINE, CHLORINE, AND FLUORINE, SAID CONTACTING BEING FOR A CONTACT TIME OF 1 TO 20 SECONDS, AT A TEMPERATURE RANGE OF FROM ABOUT 150*C. TO ABOUT 600*C., IN THE PRESENCE OF A CHROMIUM OXYFLUORIDE CATALYST, AND AT A MOLE RATIO OF BETWEEN 2.0 TO 1.0 AND 40 TO 1.0 HYDROGEN FLUORIDE TO ORGANIC, AND SEPARATING 2,3,3,3-TETRAFLUOROPROPENE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
94 words
A PROCESS FOR THE PREPARATION OF 2,3,3,3-TETRAFLUOROPROPENE WHICH COMPRISES: CONTACTING HYDROGEN FLUORIDE WITH A THREE CARBON ATOM HALOHYDROCARBON REPRESENTED BY THE FORMULA CX3CF2CH3, WHEREIN X IS SELECTED FROM THE GROUP CONSISTING OF, THE HALOGENS BROMINE, CHLORINE, AND FLUORINE, SAID CONTACTING BEING FOR A CONTACT TIME OF 1 TO 20 SECONDS, AT A TEMPERATURE RANGE OF FROM ABOUT 150*C. TO ABOUT 600*C., IN THE PRESENCE OF A CHROMIUM OXYFLUORIDE CATALYST, AND AT A MOLE RATIO OF BETWEEN 2.0 TO 1.0 AND 40 TO 1.0 HYDROGEN FLUORIDE TO ORGANIC, AND SEPARATING 2,3,3,3-TETRAFLUOROPROPENE FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2889379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |