Patent US3219692A successfully refreshed from Google Patents.
US3219692A
Expired / Lapsed
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Method for preparing para(hydroxyalkoxy)benzoic acids
Assignee: Dow Chemical Co
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Filing: 1962-02-19
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Granted: 1965-11-23
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Peter S Petrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:27
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/367
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS WHICH COMPRISES REACTING P-HYDROXYBENZOIC ACID, AT LEAST ABOUT A MOLAR EQUIVALENT OF AN ALKALI METAL HYDROXIDE AND ALKYLENE OXIDE IN AN AMOUNT AT LEAST 0.6 TO 0.8 MOLAR EXCESS OF SAID ACID REACTANT AT A TEMPERATURE OF ABOUT FROM 75* TO 110*C., ACIDIFYING THE REACTION PRODUCT AND RECOVERING A P-(HYDROXYALKOXY) BENZOIC ACID PRODUCT.
Claim 2
Dependent Claim
55 words
A PROCESS WHICH COMPRISES REACTING P-HYDROXYBENZOIC ACID, AT LEAST ABOUT A MOLAR EQUIVALENT OF AN ALKALI METAL HYDROXIDE AND ALKYLENE OXIDE IN AN AMOUNT AT LEAST 0.6 TO 0.8 MOLAR EXCESS OF SAID ACID REACTANT AT A TEMPERATURE OF ABOUT FROM 75* TO 110*C., ACIDIFYING THE REACTION PRODUCT AND RECOVERING A P-(HYDROXYALKOXY) BENZOIC ACID PRODUCT.
References Cited (Backward Citations)
US2696498A
Cited
US2686198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |