Patent US2697710A successfully refreshed from Google Patents.
US2697710A
Expired / Lapsed
US
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Pyrido (2,3-d) pyrimidines and method of preparing same
Assignee: SmithKline Beecham Corp
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Filing: 1953-01-02
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Granted: 1954-12-21
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Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 George H Hitchings
- 👤 Roland K Robins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:33
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
8 words
THE METHOD OF PREPARING COMPOUNDS OF THE FORMULA
Claim 2
Independent Claim
8 words
THE METHOD OF PREPARING COMPOUNDS OF THE FORMULA
Claim 3
Dependent Claim
13 words
THE METHOD SET FORTH IN CLAIM 1 WHEREIN THE REAGENT IS A PHENOL.
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) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |