US2941012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of tetrafluoroethylene
Assignee: EIDP Inc
•
Filing: 1958-04-23
•
Granted: 1960-06-14
•
Expires: 1978-04-23
Abstract
No abstract record available.
Inventors
- 👤 Jr William Osmond Forshey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:31
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/087; B01J19/088; C; C07; C07C; C07C17/00; C07C17/007; B01J2219/00; B01J2219/08; B01J2219/0894
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR PREPARING TETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING A MIXTURE OF A FLUORIDE OF AN ALKALI METAL OF ATOMIC NUMBER 11 TO 19 AND CHLORINE, THE MOLAR RATIO OF THE ALKALI METAL FLUORIDE TO CHLORINE BEING IN THE RANGE OF 4:1 TO 20:1, WITH EXCESS CARBON MAINTAINED AT A TEMPERATURE OF AT LEAST 1200*C., PASSING THE EFFLUENT PRODUCT AT THAT TEMPERATURE THROUGH A CARBON ARC, CONTACTING THE RESULTING EFFLUENT GAS AT A TEMPERATURE ABOVE THE BOILING POINT OF THE SAID ALKALI METAL FLUORIDE WITH ADDITIONAL CARBON AND THEREAFTER QUENCHING THE EFFLUENT GASEOUS PRODUCT TO A TEMPERATURE BELOW 500*C. WITHIN 0.1 SECOND, SAID PROCESS BEING CARRIED OUT AT AN ABSOLUTE PRESSURE BELOW 100 MM. MERCURY.
Claim 2
Dependent Claim
114 words
A PROCESS FOR PREPARING TETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING A MIXTURE OF A FLUORIDE OF AN ALKALI METAL OF ATOMIC NUMBER 11 TO 19 AND CHLORINE, THE MOLAR RATIO OF THE ALKALI METAL FLUORIDE TO CHLORINE BEING IN THE RANGE OF 4:1 TO 20:1, WITH EXCESS CARBON MAINTAINED AT A TEMPERATURE OF AT LEAST 1200*C., PASSING THE EFFLUENT PRODUCT AT THAT TEMPERATURE THROUGH A CARBON ARC, CONTACTING THE RESULTING EFFLUENT GAS AT A TEMPERATURE ABOVE THE BOILING POINT OF THE SAID ALKALI METAL FLUORIDE WITH ADDITIONAL CARBON AND THEREAFTER QUENCHING THE EFFLUENT GASEOUS PRODUCT TO A TEMPERATURE BELOW 500*C. WITHIN 0.1 SECOND, SAID PROCESS BEING CARRIED OUT AT AN ABSOLUTE PRESSURE BELOW 100 MM. MERCURY.
References Cited (Backward Citations)
US1785961A
Cited
US2709182A
Cited
US2709185A
Cited
US2709192A
Cited
US2725410A
Cited
US2852574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |