US3122541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of melamine using the
Assignee: —
•
Filing: —
•
Granted: 1964-02-25
•
Expires: 1981-02-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:02
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
73 words
PROCESS FOR THE PRODUCTION OF MELAMINE BY HEATING UREA UNDER PRESSURE, WHICH COMPRISES CARRYING OUT THE HEATING OF UREA UNDER PRESSURE IN DIRECT CONTACT WITH A SOLID, NON-METALLIC CORROSION-INSENSITIVE ELECTRICAL RESISTANCE MATERIAL, BY PASSING AN ELECTRIC CURRENT THROUGH SAID ELECTRICAL-RESISTANCE MATERIAL TO GENERATE HEAT THEREIN AS A FUNCTION OF THE ELECTRICAL RESISTANCE THEREOF TO THE CURRENT BEING PASSED THERETHROUGH, AND TRANSFERRING SAID HEAT TO THE UREA BY DIRECT CONTACT THEREWITH TO FORM MELAMINE.
Claim 2
Dependent Claim
73 words
PROCESS FOR THE PRODUCTION OF MELAMINE BY HEATING UREA UNDER PRESSURE, WHICH COMPRISES CARRYING OUT THE HEATING OF UREA UNDER PRESSURE IN DIRECT CONTACT WITH A SOLID, NON-METALLIC CORROSION-INSENSITIVE ELECTRICAL RESISTANCE MATERIAL, BY PASSING AN ELECTRIC CURRENT THROUGH SAID ELECTRICAL-RESISTANCE MATERIAL TO GENERATE HEAT THEREIN AS A FUNCTION OF THE ELECTRICAL RESISTANCE THEREOF TO THE CURRENT BEING PASSED THERETHROUGH, AND TRANSFERRING SAID HEAT TO THE UREA BY DIRECT CONTACT THEREWITH TO FORM MELAMINE.
References Cited (Backward Citations)
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Cited
US2575497A
Cited
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Cited
US2972614A
Cited
US1400959A
Cited
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Cited
GB792604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-24 | 1967-08-26 | 1968-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-24 | 1971-08-26 | 1972-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-24 | 1975-08-26 | 1976-02-25 | $7700.00 | Window Closed / Lapsed |