Patent US3833676A successfully refreshed from Google Patents.
US3833676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorination of 1,1,1-trichloroethane with hydrogen fluoride
Assignee: Daikin Industries Ltd
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Filing: 1971-07-28
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Granted: 1974-09-03
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Expires: 1991-07-28
Abstract
Abstract IN THE FLUORINATION OF 1,1,1-TROCHLOROETHANE WITH HYDROGEN FLUORIDE, A PROCESS WHEREIN ONE MOLAR AMOUNT OF 1,1,1-TRICHLOROETHANE IS TREATED WITH A NOT LESS THAN 4 MOLAR AMOUNT OF HYDROGEN FLUORIDE IN A LIQUID PHASE IN THE ABSENCE OF ANY CATALYST AT A TEMPERATURE FROM 70 TO 140*C. TO GIVE 1,1,1-DICHLOROFLUOROETHANE AND 1,1,1-CHLORODDIFLUOROEHANE SELECTIVELY. THE ADVANTAGES OF SUCH PROCESS ARE (1) UNSE OF NO CATALYST, WHEREIN THE VARIOUS PROBLEMS ENCOUNTERED IN THE USE OF A CATALYST ARE OVERCOME, (2) THE ELIMINATION OF THE FORMATION OF TAR SUBSTANCES AS BY-PRODUCTS AND (3) THE SMOOTH PROCEEDING OF THE REACTION WITHOUT AGITATION.
Inventors
- 👤 R Ukaji
- 👤 I Morioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:40
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |