US2964823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making recrystallized silicon carbide articles
Assignee: Saint Gobain Abrasives Inc
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Filing: 1957-10-16
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Granted: 1960-12-20
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Expires: 1977-10-16
Abstract
No abstract record available.
Inventors
- 👤 John I Fredriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
THE PROCESS OF MAKING RECRYSTALLIZED SILICON CARBIDE ARTICLES COMPRISING PREPARING A FREE FLOWING SLIP OF WATER AND SILICON CARBIDE HEXAGONAL CRYSTAL PARTICLES, SAID PARTICLES BEING AT LEAST 95% PUR SIC, THE SOLE INSOLUBLE SOLID MINERAL CONSTITUENT OF SAID SLIP BEING SILICON CARBIDE CRYSTAL PARTICLES, SAID SLIP HAVING AT LEAST 10% WATER AND AT LEAST 45% SILICON CARBIDE CRYSTAL PARTICLES, THE PARTICLES BEING BY WEIGHT, FROM 40% TO 90% FROM 0.1 TO 8 MICRONS, FROM 10% TO 60% FROM 45 TO 150 MICRONS WITH AT LEAST 50% BELOW 300 MICRONS AND NOT OVER 5% OF COLLOIDAL SIZE, CASTING THE SLIP IN A POROUS MOLD AND BY MEANS OF SAID POROUS MOLD REMOVING SUFFICIENT OF THE WATER TO COALESCE THE PARTICLES TO FORM AN ARTICLE WHICH CAN BE HANDLED WITHOUT BRAKING, DRYING THE ARTICLE AND THEN FIRING IT AND RECRYSTALLIZING IT IN A REDUCING ATMOSPHERE AT BETWEEN 2100*C. AND 2450*C.
Claim 2
Dependent Claim
148 words
THE PROCESS OF MAKING RECRYSTALLIZED SILICON CARBIDE ARTICLES COMPRISING PREPARING A FREE FLOWING SLIP OF WATER AND SILICON CARBIDE HEXAGONAL CRYSTAL PARTICLES, SAID PARTICLES BEING AT LEAST 95% PUR SIC, THE SOLE INSOLUBLE SOLID MINERAL CONSTITUENT OF SAID SLIP BEING SILICON CARBIDE CRYSTAL PARTICLES, SAID SLIP HAVING AT LEAST 10% WATER AND AT LEAST 45% SILICON CARBIDE CRYSTAL PARTICLES, THE PARTICLES BEING BY WEIGHT, FROM 40% TO 90% FROM 0.1 TO 8 MICRONS, FROM 10% TO 60% FROM 45 TO 150 MICRONS WITH AT LEAST 50% BELOW 300 MICRONS AND NOT OVER 5% OF COLLOIDAL SIZE, CASTING THE SLIP IN A POROUS MOLD AND BY MEANS OF SAID POROUS MOLD REMOVING SUFFICIENT OF THE WATER TO COALESCE THE PARTICLES TO FORM AN ARTICLE WHICH CAN BE HANDLED WITHOUT BRAKING, DRYING THE ARTICLE AND THEN FIRING IT AND RECRYSTALLIZING IT IN A REDUCING ATMOSPHERE AT BETWEEN 2100*C. AND 2450*C.
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |