US2667518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of trifluorochloroethylene
Assignee: MW Kellogg Co
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Filing: 1948-10-09
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Granted: 1954-01-26
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Expires: 1968-10-09
Abstract
No abstract record available.
Inventors
- 👤 John M Wrightson
- 👤 Albert L Dittman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:01
CPC Classifications
C; C07; C07C; C07C21/00; C07C21/02; C07C21/18; C07C17/00; C07C17/013; C07C17/04; C07C17/093; C07C17/20; C07C17/202; C07C17/208; C07C17/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR THE MANUFACTURE OF TRIFLUOROCHLOROETHYLENE FROM TRICHLOROETHYLENE WHICH COMPRISES REACTING TRICHLOROETHYLENE WITH BROMINE AT A TEMPERATURE BETWEEN ABOUT 20* C. AND ABOUT 100* C. TO PRODUCE THE CORRESPONDING DIBROMIDE ADDITION PRODUCT, REACTING THE RESULTING DIBROMIDE WITH HYDROGEN FLUORIDE AT A TEMPERATURE BETWEEN ABOUT 0* C. AND ABOUT 300* C. AND AT A PRESSURE BETWEEN ABOUT ATMOSPHERIC AND ABOUT 200 POUNDS PER SQUARE INCH GAGE IN THE PRESENCE OF AN ANTIMONY SALT CONTAINING CHLORINE TO PRODUCE TRIFLUORODICHLOROETHANE, AND SUBSEQUENTLY DEHYDROCHLORINATING THE TRIFLUORODICHLOROETHANE TO PRODUCE TRIFLUOROCHLOROETHYLENE AS THE PRODUCT OF THE PROCESS.
Claim 2
Dependent Claim
92 words
A PROCESS FOR THE MANUFACTURE OF TRIFLUOROCHLOROETHYLENE FROM TRICHLOROETHYLENE WHICH COMPRISES REACTING TRICHLOROETHYLENE WITH BROMINE AT A TEMPERATURE BETWEEN ABOUT 20* C. AND ABOUT 100* C. TO PRODUCE THE CORRESPONDING DIBROMIDE ADDITION PRODUCT, REACTING THE RESULTING DIBROMIDE WITH HYDROGEN FLUORIDE AT A TEMPERATURE BETWEEN ABOUT 0* C. AND ABOUT 300* C. AND AT A PRESSURE BETWEEN ABOUT ATMOSPHERIC AND ABOUT 200 POUNDS PER SQUARE INCH GAGE IN THE PRESENCE OF AN ANTIMONY SALT CONTAINING CHLORINE TO PRODUCE TRIFLUORODICHLOROETHANE, AND SUBSEQUENTLY DEHYDROCHLORINATING THE TRIFLUORODICHLOROETHANE TO PRODUCE TRIFLUOROCHLOROETHYLENE AS THE PRODUCT OF THE PROCESS.
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |