US2639301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of bromofluoromethanes
Assignee: Dow Chemical Co
•
Filing: 1949-11-02
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Granted: 1953-05-19
•
Expires: 1969-11-02
Abstract
No abstract record available.
Inventors
- 👤 Robert P Ruh
- 👤 Ralph A Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:25
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A METHOD OF PRODUCING BROMOFLUOROMETHANES THAT COMPRISES EFFECTING A VAPOR PHASE BROMINOTION OF DIFLUOROMETHANE WITH MOLECULAR BROMINE AT A TEMPERATURE BETWEEN ABOUT 250* C. AND THE PYROLYSIS TEMPERATURE UNDER THE CONDITIONS EMPLOYED, USING A CONTACT TIME NOT LONGER THAN ABOUT 75 SECONDS.
Claim 2
Independent Claim
42 words
A METHOD OF PRODUCING BROMOFLUOROMETHANES THAT COMPRISES EFFECTING A VAPOR PHASE BROMINOTION OF DIFLUOROMETHANE WITH MOLECULAR BROMINE AT A TEMPERATURE BETWEEN ABOUT 250* C. AND THE PYROLYSIS TEMPERATURE UNDER THE CONDITIONS EMPLOYED, USING A CONTACT TIME NOT LONGER THAN ABOUT 75 SECONDS.
References Cited (Backward Citations)
US2407129A
Cited
US2459767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |