Patent US2624732A successfully refreshed from Google Patents.
US2624732A
Expired / Lapsed
US
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Preparation of 5-benzyl-2,4-diaminopyrimidines
Assignee: SmithKline Beecham Corp
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Filing: 1950-05-10
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Granted: 1953-01-06
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Expires: 1970-05-10
Abstract
No abstract record available.
Inventors
- 👤 George H Hitchings
- 👤 Elvira A Falco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:30
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/47; C07D239/48; C07D239/49
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
37 words
THE METHOD OF PREPARING A 5-BENZYL-2,4DIAMINOPYRIMIDINE, WHICH CONSISTS IN THE PREPARATION OF AN A-FORMYLHDROCINNAMIC ESTER, CONDENSATION OF THE LATTER WITH GUANIDINE, CHLORINATING AND THEN HEATING THE PRODUCT IN AN ALCOHOLIC SOLUTION OF AMMONIA TO FROM THE 5-BENZYL-2,4DIAMINOPYRIMIDINE.
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) | 1956-01-06 | 1956-07-07 | 1957-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-06 | 1960-07-07 | 1961-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-06 | 1964-07-07 | 1965-01-06 | $7700.00 | Window Closed / Lapsed |