US2970176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrolysis of fluorocarbons to hexafluoropropylene
Assignee: EIDP Inc
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Filing: 1957-10-31
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Granted: 1961-01-31
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Expires: 1977-10-31
Abstract
No abstract record available.
Inventors
- 👤 Eyck Edward H Ten
- 👤 George P Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:11
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/269
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR PREPARING HEXAFLUOROPROPYLENE WHICH COMPRISES CONTINUOUSLY FEEDING INTO A REACTION ZONE MAINTAINED AT A TEMPERATURE OF 700 TO 900* C. AND AT A PRESSURE TO 0.2 P.S.I. TO 65 P.S.I. FOR A CONTACT TIME OF AT LEAST 0.05 SEC. A MIXTURE OF TETRAFLUOROETHYLENE AND HIGHER BOILING FLUOROCARBONS OF THE CLASS CONSISTING OF A MIXTURE OF CNR2N+2 CN+F2(N+3) AND CN+3F2(N+2) WHEREIN N IS A NUMBER FROM 1 TO 10, THE MOLAR RATIO OF SAID HIGHER BOILING FLUOROCARBONS TO SAID TETRAFLUOROETHYLENE BEING AT LEAST 0.05, COOLING SAID REACTION PRODUCTS, SEPARATING HEXAFLUOROPROPYLENE THEREFROM, RECYCLING THE REMAINING FLUOROCARBONS AND CONTINUOUSLY ADDING TETRAFLUOROETHYLENE TO SAID RECYCLING FLUOROCARBONS IN THE QUANTITY OF TETRAFLUOROETHYLENE CONVERTED TO HEXAFLUOROPROPYLENE WITHOUT SUBSTANTIALLY ALTERING THE AMOUNT OF SAID HIGHER BOILING FLUOROCARBONS.
Claim 2
Dependent Claim
122 words
A PROCESS FOR PREPARING HEXAFLUOROPROPYLENE WHICH COMPRISES CONTINUOUSLY FEEDING INTO A REACTION ZONE MAINTAINED AT A TEMPERATURE OF 700 TO 900* C. AND AT A PRESSURE TO 0.2 P.S.I. TO 65 P.S.I. FOR A CONTACT TIME OF AT LEAST 0.05 SEC. A MIXTURE OF TETRAFLUOROETHYLENE AND HIGHER BOILING FLUOROCARBONS OF THE CLASS CONSISTING OF A MIXTURE OF CNR2N+2 CN+F2(N+3) AND CN+3F2(N+2) WHEREIN N IS A NUMBER FROM 1 TO 10, THE MOLAR RATIO OF SAID HIGHER BOILING FLUOROCARBONS TO SAID TETRAFLUOROETHYLENE BEING AT LEAST 0.05, COOLING SAID REACTION PRODUCTS, SEPARATING HEXAFLUOROPROPYLENE THEREFROM, RECYCLING THE REMAINING FLUOROCARBONS AND CONTINUOUSLY ADDING TETRAFLUOROETHYLENE TO SAID RECYCLING FLUOROCARBONS IN THE QUANTITY OF TETRAFLUOROETHYLENE CONVERTED TO HEXAFLUOROPROPYLENE WITHOUT SUBSTANTIALLY ALTERING THE AMOUNT OF SAID HIGHER BOILING FLUOROCARBONS.
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) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |