US2577039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted pteridines and method of preparing the same
Assignee: Wyeth Holdings LLC
•
Filing: 1949-06-11
•
Granted: 1951-12-04
•
Expires: 1969-06-11
Abstract
No abstract record available.
Inventors
- 👤 Roth Barbara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:23
CPC Classifications
C; C07; C07D; C07D475/00; C07D475/06; C07D475/08; C07D475/02; C07D475/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
COMPOUNDS OF THE GROUP CONSISTING OF THOSE HAVING THE GENERAL FORMULA:
Claim 2
Independent Claim
14 words
A METHOD WHICH COMPRISES MIXING TOGETHER UNDER REACTIVE CONDITIONS A PYRIMIDINE HAVING THE FORMULA:
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) | 1954-12-03 | 1955-06-04 | 1955-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-03 | 1959-06-04 | 1959-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-03 | 1963-06-04 | 1963-12-04 | $7700.00 | Window Closed / Lapsed |