US3149170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorination of hexachlorobutadiene
Assignee: Union Carbide Corp
•
Filing: 1960-03-07
•
Granted: 1964-09-15
•
Expires: 1980-03-07
Abstract
No abstract record available.
Inventors
- 👤 Jared W Clark
- 👤 Charles E Rectenwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
C; C07; C07C; C07C17/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
46 words
A METHOD FOR PRODUCING 2-CHLOROHEPTAFFUOROBUTENE-2 WHICH COMPRISES CONTACTING A FEED MIXTURE COMPRISING HEXACHLOROBUTADIENE, HYDROGEN FLUORIDE AND CHLORINE WITH A CHROMIUM OXIDE CATALYST AT A TEMPERATURE BETWEEN 200*C. AND 550*C., SEPARATING 2-CHLOROHEPTAFLUOROBUTENE-2 AND 2,3-DICHLOROHEXAFLUOROBUTENE-2 FROM THE EFFLUENT PRODUCT MIXTURE AND RECYCLING SAID 2,3-DICHLOROHEXAFLUOROBUTENE-2 TO SAID FEED MIXTURE.
References Cited (Backward Citations)
US2436357A
Cited
US2892000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |