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Patent US3021332A successfully refreshed from Google Patents.
US3021332A
Expired / Lapsed
US
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Pyrido (2, 3-d) pyrimidine compounds and method of making
Assignee: SmithKline Beecham Corp
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Filing: 1958-01-09
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Granted: 1962-02-13
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Expires: 1978-01-09
Abstract
No abstract record available.
Inventors
- 👤 George H Hitchings
- 👤 Roland K Robins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:21
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
4 words
2- AMINO-4-HYDAROXY-6-METHYL-7-ETHYLPYRIDO 2,3-D) PYRIMIDINE.
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) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |