Patent US3170961A successfully refreshed from Google Patents.
US3170961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating dichlorobenzene isomers
Assignee: Dow Chemical Co
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Filing: 1961-02-24
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Granted: 1965-02-23
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Expires: 1981-02-24
Abstract
No abstract record available.
Inventors
- 👤 Edgar C Britton
- 👤 Floyd L Beman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:28
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/395
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A PROCESS FOR SEPARATING MIXTURES OF ISOMERIC DICHLOROBENZENES CONSISTING LARGELY OF THE META AND PARA ISOMERS, THE STEPS OF REACTING SAID MIXTURES WITH UP TO ABOUT ONE MOLE OF A BROMINATING AGENT SELECTED FROM THE GROUP CONSISTING OF BROMINE AND BROMINE CHLORIDE PER MOLE OF COMBINED META AND ORTHODICHLOROBENZENE THEREIN CONTAINED, THE QUANTITY OF SAID BROMINATING AGENT BEING SUFFICIENT TO INCREASE THE MOLE FRACTION OF P-DICHLOROBENZENE IN THE UNBROMINATED DICHLOROBENZENE SUBSTANTIALLY, IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF A NUCLEAR SUBSTITUTION BROMINATION CATALYST AT A TEMPERATURE OF ABOUT 0*C. TO ABOUT 170*C. AND SEPARATING THE BROMODICHLOROBENZENE THEREBY PRODUCED.
Claim 2
Dependent Claim
100 words
IN A PROCESS FOR SEPARATING MIXTURES OF ISOMERIC DICHLOROBENZENES CONSISTING LARGELY OF THE META AND PARA ISOMERS, THE STEPS OF REACTING SAID MIXTURES WITH UP TO ABOUT ONE MOLE OF A BROMINATING AGENT SELECTED FROM THE GROUP CONSISTING OF BROMINE AND BROMINE CHLORIDE PER MOLE OF COMBINED META AND ORTHODICHLOROBENZENE THEREIN CONTAINED, THE QUANTITY OF SAID BROMINATING AGENT BEING SUFFICIENT TO INCREASE THE MOLE FRACTION OF P-DICHLOROBENZENE IN THE UNBROMINATED DICHLOROBENZENE SUBSTANTIALLY, IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF A NUCLEAR SUBSTITUTION BROMINATION CATALYST AT A TEMPERATURE OF ABOUT 0*C. TO ABOUT 170*C. AND SEPARATING THE BROMODICHLOROBENZENE THEREBY PRODUCED.
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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |