Patent US2709182A successfully refreshed from Google Patents.
US2709182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing tetrafluoroethylene from perfluorocarbon having at least three carbon atoms
Assignee: EIDP Inc
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Filing: 1953-11-06
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Granted: 1955-05-24
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Expires: 1973-11-06
Abstract
No abstract record available.
Inventors
- 👤 Mark W Farlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:27
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/361
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A PROCESS FOR THE PREPARATION OF TETRAFLUOROETHYLENE WHEREIN A FLUOROCARBON OF AT LEAST THREE CARBONS AND OF MELTING POINT NO HIGHER THAN 25* C. IS PYROLYZED BY HEATING THE SAME TO A TEMPERATURE OF AT LEAST 1500* C., THE PYROLYSIS MIXTURE IS RAPIDLY COOLED BELOW 400* C., AND THE TETRAFLUOROETHYLENE IS REMOVED FROM THE PYROLYSIS PRODUCTS.
Claim 2
Dependent Claim
56 words
A PROCESS FOR THE PREPARATION OF TETRAFLUOROETHYLENE WHEREIN A FLUOROCARBON OF AT LEAST THREE CARBONS AND OF MELTING POINT NO HIGHER THAN 25* C. IS PYROLYZED BY HEATING THE SAME TO A TEMPERATURE OF AT LEAST 1500* C., THE PYROLYSIS MIXTURE IS RAPIDLY COOLED BELOW 400* C., AND THE TETRAFLUOROETHYLENE IS REMOVED FROM THE PYROLYSIS PRODUCTS.
References Cited (Backward Citations)
US1023783A
Cited
US1056045A
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US2551573A
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US2480560A
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US2664449A
Cited
US2676145A
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US2674631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |