US3172886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cyanuric acid from urea
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
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Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:11
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE METHOD OF PREPARING CYANURIC ACID WHICH COMPRISES FEEDING MOLTEN UREA INTO AN AGITATED INERT LIQUID MEDIUM WHICH AT ALL TIMES CONTAINS 0.5 TO 1.5 PARTS OF SLURRIED CYANURIC ACID PER PART OF LIQUID MEDIUM; MAINTAINING A TEMPERATURE BETWEEN ABOUT 200* AND ABOUT 300*C. IN THE SLURRY; RECOVERING CRUDE CYANURIC ACID FROM THE RESULTING REACTION PRODUCT; LEACHING THE CRUDE CYANURIC ACID WITH HOT DILUTE AQUEOUS AMMONIA TO DISSOLVE THE CYANURIC ACID; REMOVING INSOLUBLES FROM THE RESULTING HOT SOLUTION; ADDING A MINERAL ACID TO THE HOT SOLUTION TO AT LEAST NEUTRALIZE IT; COOLING THE SO-TREATED PRODUCT TO PRECIPITATE CYANURIC ACID; AND SEPARATING THE CYANURIC ACID FROM THE MOTHER LIQUOR.
Claim 2
Independent Claim
108 words
THE METHOD OF PREPARING CYANURIC ACID WHICH COMPRISES FEEDING MOLTEN UREA INTO AN AGITATED INERT LIQUID MEDIUM WHICH AT ALL TIMES CONTAINS 0.5 TO 1.5 PARTS OF SLURRIED CYANURIC ACID PER PART OF LIQUID MEDIUM; MAINTAINING A TEMPERATURE BETWEEN ABOUT 200* AND ABOUT 300*C. IN THE SLURRY; RECOVERING CRUDE CYANURIC ACID FROM THE RESULTING REACTION PRODUCT; LEACHING THE CRUDE CYANURIC ACID WITH HOT DILUTE AQUEOUS AMMONIA TO DISSOLVE THE CYANURIC ACID; REMOVING INSOLUBLES FROM THE RESULTING HOT SOLUTION; ADDING A MINERAL ACID TO THE HOT SOLUTION TO AT LEAST NEUTRALIZE IT; COOLING THE SO-TREATED PRODUCT TO PRECIPITATE CYANURIC ACID; AND SEPARATING THE CYANURIC ACID FROM THE MOTHER LIQUOR.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |