Patent US3147280A successfully refreshed from Google Patents.
US3147280A
Expired / Lapsed
US
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Preparation of benzofuran derivatives
Assignee: Individual
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Filing: 1963-11-22
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Granted: 1964-09-01
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Expires: 1983-11-22
Abstract
No abstract record available.
Inventors
- 👤 Jurd Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:01
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/78; C07D307/79; C07D307/80; A; A23; A23K; A23K20/00; A23K20/10; A23K20/116; A23K20/121; A23K20/126; C07D307/86
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
34 words
A METHOD FOR PREPARING COUMESTROL WHICH COMPRISES REACTING 3-METHYOXY-2'',4'',7-TRIHYDROXY FLAVYLIUM CHLORIDE WITH HYDROGEN PEROXIDE TO PRODUCE 2-(2,4-DIHYDROXYPHENYL)-3-CARBOMETHOXY-6-HYDROXY BENZOFURAN, AND REACTING SAID BENZOFURAN WITH A STRONG ACID IN THE PRESENCE OF WATER TO PRODUCE COUMESTROL.
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |