US2746961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel purine col
Assignee: —
•
Filing: —
•
Granted: 1956-05-22
•
Expires: 1973-05-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:32
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
THE PROCESS OF FORMING 6-CHLOROPURINE WHICH COMPRISES HEATING HYPOXANTHINE WITH PHOSPHORYL CHLORIDE AT TEMPERATURES SUBSTANTIALLY ABOVE THE BOILING POINT OF THE LATTER BUT BELOW 200* FOR 2 TO 5 HOURS.
Claim 2
Dependent Claim
30 words
THE PROCESS OF FORMING 6-CHLOROPURINE WHICH COMPRISES HEATING HYPOXANTHINE WITH PHOSPHORYL CHLORIDE AT TEMPERATURES SUBSTANTIALLY ABOVE THE BOILING POINT OF THE LATTER BUT BELOW 200* FOR 2 TO 5 HOURS.
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) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |