US3054796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melamine process
Assignee: WR Grace and Co
•
Filing: 1960-07-18
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Granted: 1962-09-18
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Expires: 1980-07-18
Abstract
No abstract record available.
Inventors
- 👤 Fisher Elton
- 👤 John D Christian
- 👤 Marcello T Giachino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:33
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN THE SYNTHESIS OF MELAMINE FROM AMMONIA AND CYANIC ACID ON A CATALYST AT TEMPERATURE OF 325-450*C. AND AT SUPERATMOSPHERIC PRESSURES UP TO ABOUT 6 ATMOSPHERES IN WHICH MELAMINE IS FORMED ON THE CATALYST AND IS SUBLIMED THEREFROM, CONDENSED, AND RECOVERED, THE IMPROVEMENT CONSISTING OF USING A CATALYST CONSISTING ESSENTIALLY OF CHARCOAL HAVING ADSORBED THEREON A PHOSPHATE MATERIAL, THE PHOSPHATE MATERIAL BEING 0.1-50% BY WEIGHT OF THE CHARCOAL.
Claim 2
Dependent Claim
68 words
IN THE SYNTHESIS OF MELAMINE FROM AMMONIA AND CYANIC ACID ON A CATALYST AT TEMPERATURE OF 325-450*C. AND AT SUPERATMOSPHERIC PRESSURES UP TO ABOUT 6 ATMOSPHERES IN WHICH MELAMINE IS FORMED ON THE CATALYST AND IS SUBLIMED THEREFROM, CONDENSED, AND RECOVERED, THE IMPROVEMENT CONSISTING OF USING A CATALYST CONSISTING ESSENTIALLY OF CHARCOAL HAVING ADSORBED THEREON A PHOSPHATE MATERIAL, THE PHOSPHATE MATERIAL BEING 0.1-50% BY WEIGHT OF THE CHARCOAL.
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) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |