Patent US3573079A successfully refreshed from Google Patents.
US3573079A
Expired / Lapsed
US
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Method of making high-purity dead-burned magnesia refractory grains
Assignee: Shin Nihon Kagaku Kogyo KK
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Filing: 1968-03-12
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Granted: 1971-03-30
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Expires: 1988-03-12
Abstract
Abstract A METHOD OF MAKING A HIGH-PURITY AND HIGH-DENSITY DEAD-BURNED MAGNESIA HAVING A HIGH HOT COMPRESSIVE STRENGTH BY REDUCING THE CONTENT OF FREE WATER IN A FILTER CAKE OF HIGH-PURITY MAGNESIUM HYDROXIDE WHICH IS VERY DIFFICULTLY SINTERED ACCORDING TO THE CONVENTIONAL METHODS KNOWN HERETOFORE, TO A CERTAIN PREDETERMINED RANGE, KNEADING AND CALCINING THE FILTER CAKE THUS TREATED, COMPACTING PRELIMINARILY SAID CALCINED MAGNESIA, CRUSHING AND SIZING THE PRE-COMPACTED PRODUCT, SHAPING INTO PELLETS AND DEAD-BURNING THE SAME TO GIVE THE DESIRED DEAD-BURNED MAGNESIA.
Inventors
- 👤 Hiroji Shibasaki
- 👤 Kyoichi Sasaki
- 👤 Akira Kubota
- 👤 Yasuyoshi Oda
- 👤 Kenzi Takeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |