Patent US3049544A successfully refreshed from Google Patents.
US3049544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of
Assignee: —
•
Filing: —
•
Granted: 1962-08-14
•
Expires: 1979-08-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:27
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/48; C07D239/49; C07D239/32; C07D239/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
THE METHOD OF PREPARING 2,4-DIAMINO-5-BENZYL PYRIMIDINES WHICH COMPRISES CONDENSING AN AROMATIC ALDEHYDE WITH A B-LOWER ALKOXY PROPIONITRILE IN THE PRESENCE OF A BASIC CATALYST TO GIVE A MIXTURE OF B-ALKOXY-X-ARYLYLIDENE PROPIONITRILE AND ITS TAUTOMERS AND REACTING THIS MIXTURE WITH GUANIDINE BASE.
Claim 2
Independent Claim
41 words
THE METHOD OF PREPARING 2,4-DIAMINO-5-BENZYL PYRIMIDINES WHICH COMPRISES CONDENSING AN AROMATIC ALDEHYDE WITH A B-LOWER ALKOXY PROPIONITRILE IN THE PRESENCE OF A BASIC CATALYST TO GIVE A MIXTURE OF B-ALKOXY-X-ARYLYLIDENE PROPIONITRILE AND ITS TAUTOMERS AND REACTING THIS MIXTURE WITH GUANIDINE BASE.
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) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |