US2566231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of melamine
Assignee: Wyeth Holdings LLC
•
Filing: 1943-07-17
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Granted: 1951-08-28
•
Expires: 1963-07-17
Abstract
No abstract record available.
Inventors
- 👤 Joseph Hayes Paden
- 👤 Johnstone Sinnott Mackay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:58
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
57 words
A PROCESS FOR THE PRODUCTION OF MELAMINE WHICH COMPRISES HEATING UREA AND AMMONIA FORM AN EXTERNAL SOURCE IN A PRESSURE RESISTANT VESSEL AT A TEMPERATURE IN THE RANGE OF FROM 300* C. TO 500* C. AND UNDER A PRESSURE RANGE OF FROM 200 ATMOSPHERES TO 300 ATMOSPHERES WHEREBY MELAMINE IS PRODUCED AND RECOVERING THE THUS PRODUCED MELAMINE.
Claim 2
Dependent Claim
57 words
A PROCESS FOR THE PRODUCTION OF MELAMINE WHICH COMPRISES HEATING UREA AND AMMONIA FORM AN EXTERNAL SOURCE IN A PRESSURE RESISTANT VESSEL AT A TEMPERATURE IN THE RANGE OF FROM 300* C. TO 500* C. AND UNDER A PRESSURE RANGE OF FROM 200 ATMOSPHERES TO 300 ATMOSPHERES WHEREBY MELAMINE IS PRODUCED AND RECOVERING THE THUS PRODUCED MELAMINE.
References Cited (Backward Citations)
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Cited
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Cited
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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 |