Patent US3268530A successfully refreshed from Google Patents.
US3268530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-ethyl-5-(6-purinyl) thiobarbituric acid
Assignee: Dart Industries Inc
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Filing: 1964-04-30
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Granted: 1966-08-23
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Expires: 1984-04-30
Abstract
No abstract record available.
Inventors
- 👤 Robert R Engle
- 👤 Arthur F Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:06
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/26; C07D473/36; C07D473/38
Claims Analysis
Total Claims: 0
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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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |