Patent US2746874A successfully refreshed from Google Patents.
US2746874A
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Zircon refractories
Assignee: Saint Gobain Abrasives Inc
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Filing: 1954-10-22
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Granted: 1956-05-22
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Expires: 1974-10-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Osgood J Whittemore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:45
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17411; Y10T279/17555
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
ZIRCON REFRACTORIES CONSISTING ESSENTIALLY OF FROM 80% TO 95% ZIRCON, THE REMAINDER SILICATE BOND INCLUDING AND ANALYZING WITHIN THE FOLLOWING LIMITS: CALCIUM OXIDE FROM 23.3% TO 48.2% ALUMINA FROM 11.8% TO 20.0% SILICA FROM 39.2% TO 62.2% ALKALI OXIDE FROM .0% TO 2.0% SAID SILICATE BOND HAVING NOT MORE THAN 10% OF OXIDE MATERIAL OTHER THAN SAID CALCIUM OXIDE, ALUMINA, SILICA AND ALKALI OXIDE AND SAID SILICATE BOND HAVING NOT MORE THAN 0.2% OF MATERIAL OTHER THAN OXIDE MATERIAL, ALL PERCENTAGES BEING BY WEIGHT.
Claim 2
Dependent Claim
84 words
ZIRCON REFRACTORIES CONSISTING ESSENTIALLY OF FROM 80% TO 95% ZIRCON, THE REMAINDER SILICATE BOND INCLUDING AND ANALYZING WITHIN THE FOLLOWING LIMITS: CALCIUM OXIDE FROM 23.3% TO 48.2% ALUMINA FROM 11.8% TO 20.0% SILICA FROM 39.2% TO 62.2% ALKALI OXIDE FROM .0% TO 2.0% SAID SILICATE BOND HAVING NOT MORE THAN 10% OF OXIDE MATERIAL OTHER THAN SAID CALCIUM OXIDE, ALUMINA, SILICA AND ALKALI OXIDE AND SAID SILICATE BOND HAVING NOT MORE THAN 0.2% OF MATERIAL OTHER THAN OXIDE MATERIAL, ALL PERCENTAGES BEING BY WEIGHT.
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) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |