US2667485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2,4-diamino-6-(hydroxyalkyl) pteridines
Assignee: Pharmacia and Upjohn Co
•
Filing: 1950-07-22
•
Granted: 1954-01-26
•
Expires: 1970-07-22
Abstract
No abstract record available.
Inventors
- 👤 Harold G Petering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:49
CPC Classifications
C; C07; C07D; C07D475/00; C07D475/06; C07D475/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
A MEMBER OF THE GROUP CONSISTING OF COMPOUNDS REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
12 words
A MEMBER OF THE GROUP CONSISTING OF COMPOUNDS REPRESENTED BY THE FORMULA:
Claim 3
Independent Claim
10 words
A METHOD FOR THE PREPARATION OF 2,4-DIAMINOPTERIDINES HAVING THE FORMULA:
Claim 4
Independent Claim
10 words
A METHOD FOR THE PREPARATION OF 2,4-DIAMINOPTERIDINES HAVING THE FORMULA:
References Cited (Backward Citations)
US2520156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |