Patent US2920112A successfully refreshed from Google Patents.
US2920112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of 2-chloro-1, 1, 1, 2-tetrafluoroethane
Assignee: Dow Chemical Co
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Filing: 1958-09-03
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Granted: 1960-01-05
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Expires: 1978-09-03
Abstract
No abstract record available.
Inventors
- 👤 Eric R Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:27
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR THE PREPARATION OF 2-CHLORO-1,1,1,2TETRAFLUOROETHANE WHICH INCLUDES CONTACTING 1,1-DICHLORO1,2,2,2-TETRAFLUOROETHANE WITH AN ACTIVE-HYDROGEN SOURCE SELECTED FROM THE GROUP CONSISTING OF FORMAMIDE AND ALCOHOL''S CONTAINING FROM 1 TO 3 CARBON ATOMS IN THE PRESENCE OF AN ACTIVE METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, MAGNESIUM, AND CALCIUM, AND AT A TEMPERATURE FROM ABOUT 50* TO ABOUT 180*C., WHEN THE ACTIVE METAL IS A MEMBER OF THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM, AND AT A TEMPERATURE OF FROM ABOUT 90* TO 180*C. WHEN THE ACTIVE METAL IS ZINC, AND, SEPARATING 2-CHLORO-1,1,1,2-TETRAFLUOROETHANE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
96 words
A PROCESS FOR THE PREPARATION OF 2-CHLORO-1,1,1,2TETRAFLUOROETHANE WHICH INCLUDES CONTACTING 1,1-DICHLORO1,2,2,2-TETRAFLUOROETHANE WITH AN ACTIVE-HYDROGEN SOURCE SELECTED FROM THE GROUP CONSISTING OF FORMAMIDE AND ALCOHOL''S CONTAINING FROM 1 TO 3 CARBON ATOMS IN THE PRESENCE OF AN ACTIVE METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, MAGNESIUM, AND CALCIUM, AND AT A TEMPERATURE FROM ABOUT 50* TO ABOUT 180*C., WHEN THE ACTIVE METAL IS A MEMBER OF THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM, AND AT A TEMPERATURE OF FROM ABOUT 90* TO 180*C. WHEN THE ACTIVE METAL IS ZINC, AND, SEPARATING 2-CHLORO-1,1,1,2-TETRAFLUOROETHANE FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |