US2768167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyanuric acid preparation
Assignee: —
•
Filing: —
•
Granted: 1956-10-23
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Expires: 1973-10-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:59
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/32; C07D251/40; C07D251/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
IN MAKING CYANURIC ACID BY ADMIXING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MELAMINE, AMMELINE, AMMELIDE AND THE AMMELINE:AMMELIDE COMPLEX, AND MIXTURES THEREOF WITH AN AQUEOUS SOLUTION CONTAINING SULFURIC ACID IN AMOUNT AT LEAST STOICHIOMETRIC TO THE AMINE SUBSTITUENT ON SAID COMPOUNDS AND HEATING SAID MIXTURE: THE METHOD OF IMPROVING THE REACTION RATE AND YIELD WHICH COMPRISES THE COMBINATION THEREWITH OF MAINTAINING A STOICHIOMETRIC EXCESS OF UP TO ABOUT FIVE PERCENT OF FREE ACID SUPPLIED AS AN AQUEOUS SOLUTION THEREOF HAVING A CONCENTRATION OF AT LEAST 5% FREE ACID AND MAINTAINING THE MIXTURE AT A TEMPERATURE OF AT LEAST 175* C. UNDER AT LEAST THE AUTOGENOUSLY DEVELOPED PRESSURE UNTIL REACTION SUBSTANTIALLY CEASES.
Claim 2
Dependent Claim
113 words
IN MAKING CYANURIC ACID BY ADMIXING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MELAMINE, AMMELINE, AMMELIDE AND THE AMMELINE:AMMELIDE COMPLEX, AND MIXTURES THEREOF WITH AN AQUEOUS SOLUTION CONTAINING SULFURIC ACID IN AMOUNT AT LEAST STOICHIOMETRIC TO THE AMINE SUBSTITUENT ON SAID COMPOUNDS AND HEATING SAID MIXTURE: THE METHOD OF IMPROVING THE REACTION RATE AND YIELD WHICH COMPRISES THE COMBINATION THEREWITH OF MAINTAINING A STOICHIOMETRIC EXCESS OF UP TO ABOUT FIVE PERCENT OF FREE ACID SUPPLIED AS AN AQUEOUS SOLUTION THEREOF HAVING A CONCENTRATION OF AT LEAST 5% FREE ACID AND MAINTAINING THE MIXTURE AT A TEMPERATURE OF AT LEAST 175* C. UNDER AT LEAST THE AUTOGENOUSLY DEVELOPED PRESSURE UNTIL REACTION SUBSTANTIALLY CEASES.
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) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |