US4365102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing perfluoromethane and perfluoroethane
Assignee: Chemours Mitsui Fluoroproducts Co Ltd
•
Filing: 1980-09-29
•
Granted: 1982-12-21
•
Expires: 2000-09-29
Abstract
Abstract A method of manufacturing CF4 and/or C2F6 characterized by employing a mixed gas of tetrafluoroethylene and carbon dioxide at a mol ratio of less than 4:1 and heating it to a temperature exceeding 900 DEG C.
Inventors
- 👤 Maurice J. Couture
- 👤 Dan Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:26
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/013; C07C17/04; C07C17/361
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
A method of manufacturing CF 4 and C 2 F 6 which comprises heating tetrafluoroethylene and carbon dioxide at a mol ratio of TFE to CO 2 in the range of 3:1 to 1:10 at a temperature in the range of 1100° C. to 1300° C. and separating the resulting products.
Claim 2
Independent Claim
51 words
A method of manufacturing CF 4 and C 2 F 6 which comprises heating tetrafluoroethylene and carbon dioxide at a mol ratio of TFE to CO 2 in the range of 3:1 to 1:10 at a temperature in the range of 1100° C. to 1300° C. and separating the resulting products.
Claim 3
Dependent Claim
23 words
The method of claim 1 in which the mol ratio of TFE to CO 2 is in the range of 3:2 to 1:2.
References Cited (Backward Citations)
US2758138A
Cited
US2970176A
Cited
US3446858A
Cited
US3873630A
Cited
US4137055A
Cited
US4128589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |