Patent US2778830A successfully refreshed from Google Patents.
US2778830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of z-aminopyrimidines
Assignee: —
•
Filing: —
•
Granted: 1957-01-22
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Expires: 1974-01-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:04
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/32; C07D239/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF 2-AMINOPYRIDMIDINE WHICH COMPRISES INTRODUCING A SOLUTION OF CHROMIUM TRIOXIDE IN ABOUT 50 TO 60% SULFURIC ACID INTO A SOLUTION OF ABOUT EQUIVALENT AMOUNTS OF GUANIDINE CARBONATE AND PROPARGYL ALCOHOL IN EXCESS ABOUT 50 TO 60% SULFURIC ACID AT FROM ABOUT 50* TO 60*C.
Claim 2
Dependent Claim
50 words
AN IMPROVED PROCESS FOR THE PRODUCTION OF 2-AMINOPYRIDMIDINE WHICH COMPRISES INTRODUCING A SOLUTION OF CHROMIUM TRIOXIDE IN ABOUT 50 TO 60% SULFURIC ACID INTO A SOLUTION OF ABOUT EQUIVALENT AMOUNTS OF GUANIDINE CARBONATE AND PROPARGYL ALCOHOL IN EXCESS ABOUT 50 TO 60% SULFURIC ACID AT FROM ABOUT 50* TO 60*C.
References Cited (Backward Citations)
US2449908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |