Patent US3515349A successfully refreshed from Google Patents.
Patent US2885427A successfully refreshed from Google Patents.
US2885427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorination of trichloroethylene
Assignee: Dow Chemical Co
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Filing: 1956-11-15
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Granted: 1959-05-05
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Expires: 1976-11-15
Abstract
No abstract record available.
Inventors
- 👤 Robert P Ruh
- 👤 Ralph A Davis
- 👤 Max R Broadworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:49
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS FOR FORMING A 1,1,1-TRIFLUORO-2-HALOETHANE WHICH COMPRISES: PASSING A MIXTURE OF HYDROGEN FLUORIDE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF TRICHLOROETHYLENE AND 1,1-DICHLORO-2-BROMOETHYLENE INTO CONTACT WITH A BASIC CHROMIUM FLUORIDE CATALYST FOR A TIME AND AT A TEMPERATURE SUFFICIENT TO CONVERT AT LEAST A PART OF SAID MIXTURE TO A 1,1,1-TRIFLUORO-2-HALOETHANE COMPOUND.
Claim 2
Dependent Claim
55 words
A PROCESS FOR FORMING A 1,1,1-TRIFLUORO-2-HALOETHANE WHICH COMPRISES: PASSING A MIXTURE OF HYDROGEN FLUORIDE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF TRICHLOROETHYLENE AND 1,1-DICHLORO-2-BROMOETHYLENE INTO CONTACT WITH A BASIC CHROMIUM FLUORIDE CATALYST FOR A TIME AND AT A TEMPERATURE SUFFICIENT TO CONVERT AT LEAST A PART OF SAID MIXTURE TO A 1,1,1-TRIFLUORO-2-HALOETHANE COMPOUND.
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) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |