US2697709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercapto heterocycles and method of making
Assignee: SmithKline Beecham Corp
•
Filing: 1952-06-11
•
Granted: 1954-12-21
•
Expires: 1972-06-11
Abstract
No abstract record available.
Inventors
- 👤 George H Hitchings
- 👤 Gertrude B Elion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:15
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/02; C07D473/22; C07D473/20; C07D473/24; C07D473/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
THE METHOD OF PREPARING A 6-MERCAPTOPURINE, WHEREIN A 6-CHLOROPURINE UNSUBSTITUTED IN THE IMIDAZOLE NUCLEUS IS REACTED WITH A REAGENT OF THE CLASS CONSISTING OF THIOUREA AND THE ALKALI HYDROSULFIDES.
Claim 2
Independent Claim
29 words
THE METHOD OF PREPARING A 6-MERCAPTOPURINE, WHEREIN A 6-CHLOROPURINE UNSUBSTITUTED IN THE IMIDAZOLE NUCLEUS IS REACTED WITH A REAGENT OF THE CLASS CONSISTING OF THIOUREA AND THE ALKALI HYDROSULFIDES.
Claim 3
Dependent Claim
13 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF 6-MERCAPTO PURINE AND 6-PURINYL DISULFIDE.
Claim 4
Dependent Claim
13 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF 6-MERCAPTO PURINE AND 6-PURINYL DISULFIDE.
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) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |