US2758138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrolysis process for making perfluoropropene from tetrafluoroethylene
Assignee: EIDP Inc
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Filing: 1954-05-06
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Granted: 1956-08-07
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Expires: 1974-05-06
Abstract
No abstract record available.
Inventors
- 👤 David A Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:28
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/24; C; C07; C07C; C07C17/00; C07C17/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR PREPARING HEXANTUROPROPENE WHICH COMPRISES CONTINUOUSLY FEEDING MONOMERIC TETRAFLUORO ETHYLENE INTO A REACTION ZONE HEATED TO PYROLYSIS TEMPERATURE WITHIN THE RANGE OF 750* C. TO 900 C., AT THE RATE OF 20 TO 5000 GRAMS PER HOUR PER LITER OF SAID REACTION ZONE. AT AN INITIAL TETRAFLUOROETHYLENE PRESSURE OF 25 TO 200 MM., COOLING THE RESULTING PRODUCTS AND SEPARATING HEXAFLUOROPROPENE THEREFROM, THE YIELD OF HEXAFLUOROPROPENE BEING AT LEAST 75% OF THE TETRAFLUOROETHYLENE CONSUMED.
Claim 2
Dependent Claim
75 words
A PROCESS FOR PREPARING HEXANTUROPROPENE WHICH COMPRISES CONTINUOUSLY FEEDING MONOMERIC TETRAFLUORO ETHYLENE INTO A REACTION ZONE HEATED TO PYROLYSIS TEMPERATURE WITHIN THE RANGE OF 750* C. TO 900 C., AT THE RATE OF 20 TO 5000 GRAMS PER HOUR PER LITER OF SAID REACTION ZONE. AT AN INITIAL TETRAFLUOROETHYLENE PRESSURE OF 25 TO 200 MM., COOLING THE RESULTING PRODUCTS AND SEPARATING HEXAFLUOROPROPENE THEREFROM, THE YIELD OF HEXAFLUOROPROPENE BEING AT LEAST 75% OF THE TETRAFLUOROETHYLENE CONSUMED.
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) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |