Patent US2931840A successfully refreshed from Google Patents.
US2931840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 2, 3, 3, 3-tetrafluoropropene
Assignee: EIDP Inc
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Filing: 1958-11-25
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Granted: 1960-04-05
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Expires: 1978-11-25
Abstract
No abstract record available.
Inventors
- 👤 Marquis David Maley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:54
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/269
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR PREPARING 2,333,-TETRAFLUOROPROPENE WHEREIN A MIXTURE OF ABOUT 1 MOL OF METHYL CHLORIDE AND A REACTANT TAKEN FROM THE GROUP CONSISTING OF ABOUT 1 MOL OF TETRAFLUOROETHYLENE AND ABOUT 2 MOLES OF MONOCHLORODIFLUOROMETHANE IS PYROLYZED, WITHIN A CONTACT TIME RANGE OF 0.5 TO 3.0 SECONDS, AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 700*C. TO ABOUT 950*C. TO FORM 2,3,3,3TETRAFLUOROPROPENE WHICH IS THEN RECOVERED FROM THE PRODUCT STREAM.
Claim 2
Dependent Claim
70 words
A PROCESS FOR PREPARING 2,333,-TETRAFLUOROPROPENE WHEREIN A MIXTURE OF ABOUT 1 MOL OF METHYL CHLORIDE AND A REACTANT TAKEN FROM THE GROUP CONSISTING OF ABOUT 1 MOL OF TETRAFLUOROETHYLENE AND ABOUT 2 MOLES OF MONOCHLORODIFLUOROMETHANE IS PYROLYZED, WITHIN A CONTACT TIME RANGE OF 0.5 TO 3.0 SECONDS, AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 700*C. TO ABOUT 950*C. TO FORM 2,3,3,3TETRAFLUOROPROPENE WHICH IS THEN RECOVERED FROM THE PRODUCT STREAM.
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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |