US2921099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of bromochlorofluoroethanes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1957-02-25
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Granted: 1960-01-12
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Chapman James
- 👤 Mcginty Robert Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:49
CPC Classifications
F; F16; F16D; F16D27/00; F16D27/10; F16D27/108; F16D27/112; C; C07; C07C; C07C17/00; C07C17/013; C07C17/04; C07C17/093; C07C17/20; C07C17/202; C07C17/206; C07C19/00; C07C19/08; C07C19/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
A PROCESS FOR THE MANUFACTURE OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF 2-BROMO-2-CHLORO1:1:1-TRIFLUOROETHANE AND 2-BROMO-12-DICHLORO-1:1-DIFLUORETHANE AND MIXTURES THEREOF WHICH COMPRISES HEATING 1:2-DIBROMO-1:1:2-TRICHLOROETHANE WITH SUBSTANIALLY ANHYDROUS HYDROGEN FLUORIDE AT A TEMPERATURE IN THE RANGE 90* TO 200* C. AND IN THE PRESENCE OF AN ANTIMONY FLUOCHLORIDE CATALYST CONTAINIG AT LEAST 20% OF PENTAVALENT ANTIMONY, AND SEPARATING THE DESIRED SAID MEMBER FROM THE REACTION PRODUCT.
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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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |