Patent US3143576A successfully refreshed from Google Patents.
US3143576A
Expired / Lapsed
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Process for making tetrabromohydroquinone
Assignee: Dow Chemical Co
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Filing: 1962-08-30
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Granted: 1964-08-04
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Expires: 1982-08-30
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Kovacic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:16
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS FOR MAKING TETRAABROMOHYDROQUINONE WHICH COMPRISES REACTING BY CONTACTING ABOUT FOUR MOLES OF BROMINE WITH ONE MOLE OF HYDROQUINONE DISSOLVED IN ABOUT ONE TO ABOUT 2.5 LITERS PER GRAM MOLE OF HYDROQUINONE OF A MIXED SOLVENT CONSISTING OF ABOUT 2 TO ABOUT 15 PARTS BY VOLUME OF A NORMALLY LIQUID INERT CHLORINATED HYDROCARBON AND ONE PART OF METHANOL.
Claim 2
Dependent Claim
59 words
A PROCESS FOR MAKING TETRAABROMOHYDROQUINONE WHICH COMPRISES REACTING BY CONTACTING ABOUT FOUR MOLES OF BROMINE WITH ONE MOLE OF HYDROQUINONE DISSOLVED IN ABOUT ONE TO ABOUT 2.5 LITERS PER GRAM MOLE OF HYDROQUINONE OF A MIXED SOLVENT CONSISTING OF ABOUT 2 TO ABOUT 15 PARTS BY VOLUME OF A NORMALLY LIQUID INERT CHLORINATED HYDROCARBON AND ONE PART OF METHANOL.
References Cited (Backward Citations)
US1912744A
Cited
FR1060371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |