Patent US2566227A successfully refreshed from Google Patents.
US2566227A
Expired / Lapsed
US
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Preparation of melamine
Assignee: —
•
Filing: —
•
Granted: 1951-08-28
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Expires: 1968-08-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:01
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/56; C07D251/58; C07D251/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A METHOD WHICH COMPRISES THE STEPS OF BRINGING INTO INTIMATE CONTACT WITH A SOLUTION OF DICYANDIAMIDE IN AMMONIA AN ADDITIONAL QUANDICYANDIAMIDE IN AMMONIA AN ADDITIONAL QUANTITY OF AMMONIA HEATED TO 500 TO 600* C. WHEREBY THE RANGE 400 TO 550* C., AND A PRRESSURE WITHIN THE RANGE 750 TO 5000 P.S.I. WHEREUPON MELAMINE IS FORMED, AND THEN COOLING THE REACTION MIXTURE AND SEPARATING THE MELAMINE FROM AMMONIA.
Claim 2
Independent Claim
67 words
A METHOD WHICH COMPRISES THE STEPS OF BRINGING INTO INTIMATE CONTACT WITH A SOLUTION OF DICYANDIAMIDE IN AMMONIA AN ADDITIONAL QUANDICYANDIAMIDE IN AMMONIA AN ADDITIONAL QUANTITY OF AMMONIA HEATED TO 500 TO 600* C. WHEREBY THE RANGE 400 TO 550* C., AND A PRRESSURE WITHIN THE RANGE 750 TO 5000 P.S.I. WHEREUPON MELAMINE IS FORMED, AND THEN COOLING THE REACTION MIXTURE AND SEPARATING THE MELAMINE FROM AMMONIA.
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) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |