Patent US2993048A successfully refreshed from Google Patents.
US2993048A
Expired / Lapsed
US
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Substituted diaminopurines and method of preparing the same
Assignee: Individual
•
Filing: 1959-07-31
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Granted: 1961-07-18
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Expires: 1979-07-31
Abstract
No abstract record available.
Inventors
- 👤 Shive William
- 👤 Jr Charles G Skinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:52
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/02; C07D473/24; C07D473/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA:
References Cited (Backward Citations)
US2844576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |