Patent US3275631A successfully refreshed from Google Patents.
US3275631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of cyanuric acid
Assignee: Shikoku Chemicals Corp
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Filing: 1964-08-05
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Granted: 1966-09-27
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Expires: 1984-08-05
Abstract
No abstract record available.
Inventors
- 👤 Yanagizawa Hiroshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:41
CPC Classifications
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Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
A PROCESS OF PRODUCING CYANURIC ACID COMPRISING STEPS OF SUBJECTING A STARTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF UREA, BIURET, AND MIXTURES OF THE TWO TO A HEAT TREATMENT ON THE SURFACE OF AT LEAST A MOLTEN METAL HAVING A MELTING POINT NOT EXECCDING 350* C. AND MAINTAINED AT A TEMPERATURE NOT EXCEEDING 400* C., SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF TIN, BISMUTH, LEAD AND ALLOYS, SAID ALLOYS INCLUDING AT LEAST TWO COMPONENTS OF TIN LEAD, GRINDING A SOLID INTERMEDIATE PRODUCT OBTAINED BY SAID HEAT TREATMENT SO AS TO OBTAIN POWDER HAVING FREE FLUIDITY, AND SUBSEQUENTLY HEATING SAID POWDER BY MEANS OF A JACKETED HEATER.
References Cited (Backward Citations)
US3172886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |