Patent US2615019A successfully refreshed from Google Patents.
US2615019A
Expired / Lapsed
US
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Preparation of guanidine and melamine
Assignee: Wyeth Holdings LLC
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Filing: 1950-10-25
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Granted: 1952-10-21
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Expires: 1970-10-25
Abstract
No abstract record available.
Inventors
- 👤 Jr William J Klapproth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:10
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
63 words
METHOD THAT COMPRISES HEATING HYDROGEN CYANIDE, AMMONIA, AND PHOSPHORIC ACID IN THE PRESENCE OF A CATALYST OF THE GROUP CONSISTING OF FULLER''S EARTH, KIESELGUHR, CELITE, PUMICE, ALUMINA, AND KAOLIN AT A TEMPERATURE IN THE APPROXIMATE RANGE OF 275-450* C. AND UNDER A PRESSURE OF AT LEAST 500 P.S.I. IN A CLOSED REACTION ZONE TO FORM A REACTION MASS COMPRISING GUANIDINE PHOSHPATE AND MELAMINE.
Claim 2
Dependent Claim
63 words
METHOD THAT COMPRISES HEATING HYDROGEN CYANIDE, AMMONIA, AND PHOSPHORIC ACID IN THE PRESENCE OF A CATALYST OF THE GROUP CONSISTING OF FULLER''S EARTH, KIESELGUHR, CELITE, PUMICE, ALUMINA, AND KAOLIN AT A TEMPERATURE IN THE APPROXIMATE RANGE OF 275-450* C. AND UNDER A PRESSURE OF AT LEAST 500 P.S.I. IN A CLOSED REACTION ZONE TO FORM A REACTION MASS COMPRISING GUANIDINE PHOSHPATE AND MELAMINE.
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) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |