US2722558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of fluoroethylenes
Assignee: Dow Chemical Co
•
Filing: 1951-12-05
•
Granted: 1955-11-01
•
Expires: 1971-12-05
Abstract
No abstract record available.
Inventors
- 👤 Johnston Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:54
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/10; Y; Y10; Y10T; Y10T70/00; Y10T70/60; Y10T70/625; Y10T70/65
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
THE PROCESS WHICH COMPRISES PASSING CHLORINE AND ETHYLIDENE FLUORIDE IN A MOLE RATIO BETWEEN 1:1 AND 3.5:1 THROUGH A REACTION ZONE MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 500* AND 700* C. AT A FLOW RATE SUCH THAT THE CONTACT TIME IS NOT LESS THAN 0.1 SECOND, AND SEPARATING AS PRINCIPAL PRODUCTS COMPOUNDS FROM THE GROUP CONSISTING OF 1,1-DIFLUOROETHYLENE, 1-CHLORO-2,2-DIFLUOROETHYLENE, AND 1,1-DICHLORO-2,2-DIFLUOROETHYLENE.
Claim 2
Dependent Claim
61 words
THE PROCESS WHICH COMPRISES PASSING CHLORINE AND ETHYLIDENE FLUORIDE IN A MOLE RATIO BETWEEN 1:1 AND 3.5:1 THROUGH A REACTION ZONE MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 500* AND 700* C. AT A FLOW RATE SUCH THAT THE CONTACT TIME IS NOT LESS THAN 0.1 SECOND, AND SEPARATING AS PRINCIPAL PRODUCTS COMPOUNDS FROM THE GROUP CONSISTING OF 1,1-DIFLUOROETHYLENE, 1-CHLORO-2,2-DIFLUOROETHYLENE, AND 1,1-DICHLORO-2,2-DIFLUOROETHYLENE.
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) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |