Patent US2561390A successfully refreshed from Google Patents.
US2561390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing melamine
Assignee: —
•
Filing: —
•
Granted: 1951-07-24
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Expires: 1968-07-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:21
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/54; C07D251/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PROCESS FOR PREPARING MELAMINE CONSISTING OF HEATING A MEMBER OF THE GROUP CONSISTING OF GUANIDINE THIOCYANATE AND GUANYLTHIOUREA IN A CLOSED REACTION VESSEL AT A TEMPERATURE WITHIN THE RANGE OF SUBSTANTIALLY 350* -500* C.
Claim 2
Dependent Claim
35 words
A PROCESS FOR PREPARING MELAMINE CONSISTING OF HEATING A MEMBER OF THE GROUP CONSISTING OF GUANIDINE THIOCYANATE AND GUANYLTHIOUREA IN A CLOSED REACTION VESSEL AT A TEMPERATURE WITHIN THE RANGE OF SUBSTANTIALLY 350* -500* C.
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) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |