US2655501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making 5-formamido-6-amino uracils
Assignee: Monsanto Chemicals Ltd
•
Filing: 1948-06-03
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Granted: 1953-10-13
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Expires: 1968-06-03
Abstract
No abstract record available.
Inventors
- 👤 Oliver J Weinkauff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:04
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/52; C07D239/54; C07D239/545
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
THE IMPROVED PROCESS COMPRISING HEATING 5,6-DIAMINO URACIL WITH A DILUTE AQUEOUS FORMIC ACID SOLUTION, IN THE PROPORTION OF ONE EQUIVALENT OF DIAMINE TO 1 TO 5 EQUIVALENTS OF FORMIC ACID AT A TEMPERATURE ABOVE 80* C. AND SUBSEQUENTLY RECOVERING 5-FORMAMIDO-6-AMINO URACIL FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
45 words
THE IMPROVED PROCESS COMPRISING HEATING 5,6-DIAMINO URACIL WITH A DILUTE AQUEOUS FORMIC ACID SOLUTION, IN THE PROPORTION OF ONE EQUIVALENT OF DIAMINE TO 1 TO 5 EQUIVALENTS OF FORMIC ACID AT A TEMPERATURE ABOVE 80* C. AND SUBSEQUENTLY RECOVERING 5-FORMAMIDO-6-AMINO URACIL FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2564351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |