Patent US3240826A successfully refreshed from Google Patents.
US3240826A
Expired / Lapsed
US
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Selective fluorination of polyhaloethanes
Assignee: Dow Chemical Co
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Filing: 1962-01-22
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Granted: 1966-03-15
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Expires: 1982-01-22
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:52
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/208
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR THE FLUORINATION OF A POLYHALOETHANE HAVING THE FORMULA CF2XCBR2Y, WHEREIN X IS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF FLOURINE AND BROMINE, AND Y IS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF BROMINE AND HYDROGEN, COMPRISING, HEATING SAID POLYHALOETHANE WITH SBF4CL AT A TEMPERATURE FROM ABOUT 35 TO ABOUT 120 DEGREES CENTIGRADE THEREBY TO REPLACE AT LEAST A PART OF THE BROMINE IN SAID POLYHALOETHANE WITH FLUORINE.
Claim 2
Dependent Claim
72 words
A PROCESS FOR THE FLUORINATION OF A POLYHALOETHANE HAVING THE FORMULA CF2XCBR2Y, WHEREIN X IS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF FLOURINE AND BROMINE, AND Y IS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF BROMINE AND HYDROGEN, COMPRISING, HEATING SAID POLYHALOETHANE WITH SBF4CL AT A TEMPERATURE FROM ABOUT 35 TO ABOUT 120 DEGREES CENTIGRADE THEREBY TO REPLACE AT LEAST A PART OF THE BROMINE IN SAID POLYHALOETHANE WITH FLUORINE.
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |