Patent US2667486A successfully refreshed from Google Patents.
US2667486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2,4-diamino pteridine and derivatives
Assignee: Research Corp
•
Filing: 1951-05-24
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Granted: 1954-01-26
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Expires: 1971-05-24
Abstract
No abstract record available.
Inventors
- 👤 Cornelius K Cain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:56
CPC Classifications
C; C07; C07D; C07D475/00; C07D475/06; C07D475/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
3 words
2,4-DIAMINO-6,7-DI-(MONOCYCLIC ARYL) PTERIDINES.
Claim 2
Dependent Claim
3 words
2,4-DIAMINO-6,7-DI-(MONOCYCLIC ARYL) PTERIDINES.
References Cited (Backward Citations)
US2568597A
Cited
CH231852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |