Patent US3210356A successfully refreshed from Google Patents.
US3210356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pteridine compounds and processes for their preparation
Assignee: Smith Kline & French Laboratories Ltd
•
Filing: 1961-12-15
•
Granted: 1965-10-05
•
Expires: 1981-12-15
Abstract
No abstract record available.
Inventors
- 👤 Irwin J Pachter
- 👤 Weinstock Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:09
CPC Classifications
C; C07; C07D; C07D475/00; C07D475/06; C07D475/10; C07D475/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
IN THE PROCESS FOR THE PREPARATION OF COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF 2,7-DISUBSTITUTED4,6-DIAMINOPTERIDINES AND THE NON-TOXIC ACID ADDITION SALTS THEREOF, IN WHICH SAID 2,7-DISBUTSITUTED-4, 6-DIAMINOPTERIDINES ARE OF THE STRUCTURAL FORMULA:
Claim 2
Dependent Claim
32 words
IN THE PROCESS FOR THE PREPARATION OF COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF 2,7-DISUBSTITUTED4,6-DIAMINOPTERIDINES AND THE NON-TOXIC ACID ADDITION SALTS THEREOF, IN WHICH SAID 2,7-DISBUTSITUTED-4, 6-DIAMINOPTERIDINES ARE OF THE STRUCTURAL FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |