US2644845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halogenation of fluorocarbons
Assignee: Purdue Research Foundation
•
Filing: 1947-06-20
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Granted: 1953-07-07
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Expires: 1967-06-20
Abstract
No abstract record available.
Inventors
- 👤 Earl T Mcbee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:47
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE PROCESS WHICH COMPRISES: HEATING A 1,1, 1-TRIHALOGENATED ALKANE CONTAINING FROM 2 TO 3 CARBON ATOMS, AT LEAST TWO OF THE HALOGEN ATOMS BEING FLUORINE, WITH A HALOGEN SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, FOR A CONTACT TIME BETWEEN 2.7 AND 30 SECONDS, IN THE VAPOR PHASE, UNDER ANHYDROUS CONDITIONS, AT A REACTION TEMPERATURE BETWEEN ABOUT 365 AND 450 DEGREES CENTIGRADE, THE VOLUME PROPORTION OF HALOGEN TO TRIHALOKANE BEING BETWEEN 0.8:1 AND THAT PROPORTION OF HALOGEN REQUIRED TO PHYSICALLY SATURTE THE TRIALOALKANE AT 45 DEGREES CENTIGRADE, AND SEPARATING THE REACTION PRODUCTS.
Claim 2
Dependent Claim
94 words
THE PROCESS WHICH COMPRISES: HEATING A 1,1, 1-TRIHALOGENATED ALKANE CONTAINING FROM 2 TO 3 CARBON ATOMS, AT LEAST TWO OF THE HALOGEN ATOMS BEING FLUORINE, WITH A HALOGEN SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, FOR A CONTACT TIME BETWEEN 2.7 AND 30 SECONDS, IN THE VAPOR PHASE, UNDER ANHYDROUS CONDITIONS, AT A REACTION TEMPERATURE BETWEEN ABOUT 365 AND 450 DEGREES CENTIGRADE, THE VOLUME PROPORTION OF HALOGEN TO TRIHALOKANE BEING BETWEEN 0.8:1 AND THAT PROPORTION OF HALOGEN REQUIRED TO PHYSICALLY SATURTE THE TRIALOALKANE AT 45 DEGREES CENTIGRADE, AND SEPARATING THE REACTION PRODUCTS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |