Patent US3290386A successfully refreshed from Google Patents.
US3290386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of 4, 4' dihydroxyphenyl ether
Assignee: EIDP Inc
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Filing: 1963-09-27
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Granted: 1966-12-06
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Expires: 1983-09-27
Abstract
No abstract record available.
Inventors
- 👤 Stamatoff Gelu Stoeff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:34
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/18; C07C41/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR THE MANUFACTURE OF 4,4'' DIHYDROXYPHENYL ETHER WHICH COMPRISES HEATING A MIXTURE OF 4,4'' DIBROMOPHENYL ETHER WITH A STOICHIOMETRIC EXCESS OF A CAUSTIC ALKALI DISSOLVED IN WATER IN AN AMOUNT OF FROM ABOUT 25% TO ABOUT 50% BY WEIGHT OF SAID ALKALI, AND WITH FROM ABOUT 1% TO ABOUT 50% BY WEIGHT OF AN ALKALI METAL PEROXIDE BASED ON THE 4,4'' DIBROMOPHENYL ETHER ABOUT 1% TO 25% BY WEIGHT OF A CUPROUS HALIDE BASED ON 4,4'' DIBROMOPHENYL ETHER, AND METALLIC COPPER, AND THEREAFTER RECOVERING 4,4'' DIHYDROXYPHENYL ETHER FROM THE REACTION PRODUCT.
Claim 2
Dependent Claim
93 words
A PROCESS FOR THE MANUFACTURE OF 4,4'' DIHYDROXYPHENYL ETHER WHICH COMPRISES HEATING A MIXTURE OF 4,4'' DIBROMOPHENYL ETHER WITH A STOICHIOMETRIC EXCESS OF A CAUSTIC ALKALI DISSOLVED IN WATER IN AN AMOUNT OF FROM ABOUT 25% TO ABOUT 50% BY WEIGHT OF SAID ALKALI, AND WITH FROM ABOUT 1% TO ABOUT 50% BY WEIGHT OF AN ALKALI METAL PEROXIDE BASED ON THE 4,4'' DIBROMOPHENYL ETHER ABOUT 1% TO 25% BY WEIGHT OF A CUPROUS HALIDE BASED ON 4,4'' DIBROMOPHENYL ETHER, AND METALLIC COPPER, AND THEREAFTER RECOVERING 4,4'' DIHYDROXYPHENYL ETHER FROM THE REACTION PRODUCT.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |