US2937284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2, 4-diamino-5, 6-dialkylpyrido (2, 3-d) pyrimidines and method
Assignee: SmithKline Beecham Corp
•
Filing: 1958-05-01
•
Granted: 1960-05-17
•
Expires: 1978-05-01
Abstract
No abstract record available.
Inventors
- 👤 George H Hitchings
- 👤 Kurt W Ledig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:55
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A 2,4-DIAMINOPYRIDO (2,3-D) PYRIMIDINE OF THE FORMULA
Claim 2
Dependent Claim
7 words
A 2,4-DIAMINOPYRIDO (2,3-D) PYRIMIDINE OF THE FORMULA
References Cited (Backward Citations)
GB774095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |