US3498970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing 6-substituted-8-mercaptopurine derivatives
Assignee: Ajinomoto Co Inc
•
Filing: 1968-02-08
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Granted: 1970-03-03
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Expires: 1988-02-08
Abstract
No abstract record available.
Inventors
- 👤 Yoshitaka Yamada
- 👤 Moritaro Sakurai
- 👤 Izumi Kumashiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:56
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/02; C07H19/04; C07H19/16; C07D; C07D473/00; C07D473/26; C07D473/36; C07D473/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2500142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |