US3096379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of tetrafluoroethylene
Assignee: Sunoco Inc
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Filing: 1960-11-30
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Granted: 1963-07-02
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Expires: 1980-11-30
Abstract
No abstract record available.
Inventors
- 👤 Blair Edgar Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:43
CPC Classifications
C; C07; C07C; C07C21/00; C07C21/02; C07C21/18; C07C21/185; C07C17/00; C07C17/093; C07C17/10; C07C17/20; C07C17/202; C07C17/206; C07C17/26; C07C17/263; C07C17/269
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
METHOD OF PREPARING TETRAFLUOROETHYLENE WHICH COMPRISES: (1) CONTACTING METHANE WITH A FERRIC HALIDE SELECED FROM THE GROUP CONSISTING OF FERRIC CHLORIDE AND FERRIC BROMIDE AT A TEMPERATURE IN THE RANGE OF 220-375*C. AND WITH A FERRIC HALIDE: METHANE MOLAR RATIO OF 0.3:1 TO 2.5:1, WHEREBY HALOGENATION OF THE METHANE OCCURS AND THE FERRIC HALIDE IS REDUCED TO FERROUS HALIDE; (2) SEPARATELY RECOVERING HALOFORM AND HYDROGEN HALIDE FROM THE REACTION MIXTURE; (3) RECTING THE HALOFORM WITH HYDROGEN FLUORIDE AT A TEMPERATURE IN THE RANGE OF 250-550* C. AND WITH A HYDROGEN FLUORIDE:METHYL HALIDE MOLAR RATIO OF 1:1 TO 4:1; (4) SEPARATELY RECOVERING MONOHALODIFLUOROMETHANE AND HYDROGEN HALIDE FROM THE REACTION MIXTURE; (5) PYROLYZING SAID MONOHALODIFLUOROMETHANE AT A TEMPERATURE IN THE RANGE OF 650*-850*C.; (6) SEPARATELY RECOVERING TETRAFLUOROETHYLENE AND HYDROGEN HALIDE FROM THE PYROLYSIS PRODUCTS; (7) CONTACTING THE FERROUS HALIDE WITH OXYGEN AND WITH THE HYDROGEN HALIDE RECOVERED IN STEPS (2), (4) AND (6) TO RE-FORM FERRIC HALIDE; AND (8) RECYCLING THE FERRIC HALIDE TO STEP (1).
Claim 2
Dependent Claim
164 words
METHOD OF PREPARING TETRAFLUOROETHYLENE WHICH COMPRISES: (1) CONTACTING METHANE WITH A FERRIC HALIDE SELECED FROM THE GROUP CONSISTING OF FERRIC CHLORIDE AND FERRIC BROMIDE AT A TEMPERATURE IN THE RANGE OF 220-375*C. AND WITH A FERRIC HALIDE: METHANE MOLAR RATIO OF 0.3:1 TO 2.5:1, WHEREBY HALOGENATION OF THE METHANE OCCURS AND THE FERRIC HALIDE IS REDUCED TO FERROUS HALIDE; (2) SEPARATELY RECOVERING HALOFORM AND HYDROGEN HALIDE FROM THE REACTION MIXTURE; (3) RECTING THE HALOFORM WITH HYDROGEN FLUORIDE AT A TEMPERATURE IN THE RANGE OF 250-550* C. AND WITH A HYDROGEN FLUORIDE:METHYL HALIDE MOLAR RATIO OF 1:1 TO 4:1; (4) SEPARATELY RECOVERING MONOHALODIFLUOROMETHANE AND HYDROGEN HALIDE FROM THE REACTION MIXTURE; (5) PYROLYZING SAID MONOHALODIFLUOROMETHANE AT A TEMPERATURE IN THE RANGE OF 650*-850*C.; (6) SEPARATELY RECOVERING TETRAFLUOROETHYLENE AND HYDROGEN HALIDE FROM THE PYROLYSIS PRODUCTS; (7) CONTACTING THE FERROUS HALIDE WITH OXYGEN AND WITH THE HYDROGEN HALIDE RECOVERED IN STEPS (2), (4) AND (6) TO RE-FORM FERRIC HALIDE; AND (8) RECYCLING THE FERRIC HALIDE TO STEP (1).
References Cited (Backward Citations)
GB428445A
Cited
US2551573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-01 | 1966-12-31 | 1967-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-01 | 1970-12-31 | 1971-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-01 | 1974-12-31 | 1975-07-02 | $7700.00 | Window Closed / Lapsed |