US2550659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing melamine
Assignee: —
•
Filing: —
•
Granted: 1951-04-24
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Expires: 1968-04-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:43
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/56; C07D251/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PROCESS FOR THE PRODUCTION OF MELAMINE WHICH COMPRISES HEATING, IN ABSENCE OF SUBSTANTIAL AMOUNTS OF WATER; REACTANTS COMPRISING UREA IN A REACTION ZONE TO WHICH IS ADDED LESS THAN 10 MOL PERCENT ON THE REACTANTS OF MATERIAL OF THE GROUP CONSISTING OF PHOSPHORIC ACID, ITS SALTS, AND ITS ANHYDRIDES, AND MIXTURES THEREOF; AND CONTINUING TO HEAT THE REACTION MIXTURE, AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 300* C.-450* C. AND IN CONTACT WITH AN ATMOSPHERE CONTAINING AMMONIC AND CARBON DIOXIDE IN WHICH THE PARTIAL PRESSURE OF AMMONIA AND CARBON DIOXIDE REACHES AT LEAST ABOUT 1000 P.S.I. DURING THE REACTION, UNTIL AT LEAST A SUBSTANTIAL PORTION OF THE REACTION MIXTURE ITS CONVERTED TO MELAMINE.
Claim 2
Dependent Claim
115 words
A PROCESS FOR THE PRODUCTION OF MELAMINE WHICH COMPRISES HEATING, IN ABSENCE OF SUBSTANTIAL AMOUNTS OF WATER; REACTANTS COMPRISING UREA IN A REACTION ZONE TO WHICH IS ADDED LESS THAN 10 MOL PERCENT ON THE REACTANTS OF MATERIAL OF THE GROUP CONSISTING OF PHOSPHORIC ACID, ITS SALTS, AND ITS ANHYDRIDES, AND MIXTURES THEREOF; AND CONTINUING TO HEAT THE REACTION MIXTURE, AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 300* C.-450* C. AND IN CONTACT WITH AN ATMOSPHERE CONTAINING AMMONIC AND CARBON DIOXIDE IN WHICH THE PARTIAL PRESSURE OF AMMONIA AND CARBON DIOXIDE REACHES AT LEAST ABOUT 1000 P.S.I. DURING THE REACTION, UNTIL AT LEAST A SUBSTANTIAL PORTION OF THE REACTION MIXTURE ITS CONVERTED TO MELAMINE.
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) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |