US3563987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cyanuric acid
Assignee: FMC Corp
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Filing: 1969-04-01
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Granted: 1971-02-16
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Expires: 1989-04-01
Abstract
Abstract A HIGHLY-PURE CYANURIC ACIDS IS PRODUCED BY HEATING UREA OR BIURET IN AN INERT SOLVENT THEREFOR, AT TEMPERATURES OF AT LEAST ABOUT 180*C., AND PREFERABLY ABOUT 200-250*C., UNDER SUBATMOSPHERIC PRESSURES OF FROM 0 TO ABOUT 250 MM. OF HG; THE CYANURIC ACID IS RECOVERED AS A SOLID PRECIPITATE FROM THE UREA OR BIURET SOLVENT SUBSTANTIALLY FREE OF AMIDES OF CYANURIC ACID.
Inventors
- 👤 Sidney Berkowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:16
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/32
Claims Analysis
Total Claims: 0
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |