US2585898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of troublesome fractions from benzene hexachloride
Assignee: Dow Chemical Co
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Filing: 1948-09-29
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Granted: 1952-02-12
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Expires: 1968-09-29
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Kauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:37
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/392
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
145 words
THE METHOD OF REFINING A BENZENE HEXACHLORIDE PRODUCT CONTAINING AT LEAST 20 AND NOT AS MUCH AS 60 PER CENT OF GAMMA-BENZENE HEXACHLORIDE TOGETHER WITH 10 TO 30 PER CENT, IN THE AGGREGATE, OF TROUBLESOME FRACTIONS INCLUDING DELTA-BENZENE HEXACHLORIDE AND HEPTA- AND HIGHER CHLOROCYCLOHEXANES, SUBSTANTIALLY ALL OF THE BALANCE BEING ALPHA-BENZENE HEXACHLORIDE, WHICH COMPRISES MIXING SUCH A MATERIAL WITH FROM 60 TO 75 PER CENT OF ITS WEIGHT OF 2-PROPANOL TO FORM A SLURRY; HEATING THE SLURRY TO A TEMPERATURE UP TO THE BOILING POINT OF 2-PROPANOL; COOLING THIS SLURRY, WITH STIRRING, TO FROM 10* TO 20* C., RECOVERING THE UNDISSOLVED CRYSTALS OF BENZENE HEXACHLORIDE IN A STATE OF IMPROVED PURITY; TREATING THESE CRYSTALS AGAIN IN LIKE MANNER WITH 2-PROPANOL AND RECOVERING CRYSTALS CHARACTERIZED BY A HIGHER GAMMA-ISOMER CONTENT WHICH IS FROM 30 TO 60 PER CENT AND BY SUBSTANTIAL FREEDOM FROM SAID TROUBLESOME FRACTIONS.
References Cited (Backward Citations)
US1147767A
Cited
US2438900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |