US2803669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing the halogen content of halophenols
Assignee: Dow Chemical Co
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Filing: 1955-12-27
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Granted: 1957-08-20
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Expires: 1975-12-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Arthur E Brainerd
- 👤 Poffenberger Noland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:32
CPC Classifications
C; C07; C07C; C07C37/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE METHOD WHICH COMPRISES BRINGING THE VAPOR OF AT LEAST ONE HALOPHENOL OF THE CLASS CONSISTING OF THE CHLORO-AND BROMOPHENOLS AND HYDROGEN INTO INTIMATE CONTACT WITH A CUPROUS HALIDE OF THE CLASS CONSISTING OF THE CHLORIDE AND BROMIDE SUPPORTED ON POROUS ACTIVATED ALUMINA, THE AMOUNT OF CUPROUS HALIDE BEING FROM 2 TO 25 PERCENT OF THE WEIGHT OF ALUMINA, AT A REACTION TEMPERATURE IN THE RANGE FROM 350* TO 550*C., AND RECOVERING A PHENOLIC PRODUCT CONTAINING LESS HALOGEN THAN THE HALOPHENOL SUPPLIED TO THE REACTION.
Claim 2
Independent Claim
85 words
THE METHOD WHICH COMPRISES BRINGING THE VAPOR OF AT LEAST ONE HALOPHENOL OF THE CLASS CONSISTING OF THE CHLORO-AND BROMOPHENOLS AND HYDROGEN INTO INTIMATE CONTACT WITH A CUPROUS HALIDE OF THE CLASS CONSISTING OF THE CHLORIDE AND BROMIDE SUPPORTED ON POROUS ACTIVATED ALUMINA, THE AMOUNT OF CUPROUS HALIDE BEING FROM 2 TO 25 PERCENT OF THE WEIGHT OF ALUMINA, AT A REACTION TEMPERATURE IN THE RANGE FROM 350* TO 550*C., AND RECOVERING A PHENOLIC PRODUCT CONTAINING LESS HALOGEN THAN THE HALOPHENOL SUPPLIED TO THE REACTION.
References Cited (Backward Citations)
US2576161A
Cited
BE516523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |