Patent US2053665A successfully refreshed from Google Patents.
Patent US3261698A successfully refreshed from Google Patents.
US3261698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory shapes
Assignee: Harbison Walker Refractories Co
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Filing: 1964-09-04
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Granted: 1966-07-19
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Expires: 1984-09-04
Abstract
No abstract record available.
Inventors
- 👤 Dwight S Whittemore
- 👤 Thomas W Smoot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/46; C04B35/50
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A FIRED REFRACTORY SHAPE OF GOOD RESISTANCE TO PENETRATION AND WETTING BY MOLTEN METAL AND SLAGS COMPRISING A SKELETAL REFRACTORY STRUCTURE CHARACTERIZED BY EXTENSIVE INTERCONNECTED INTERIOR PORE SPACE MOUNTING TO BETWEEN ABOUT 15 TO 30% OF THE VOLUME THEREOF AND CONSISTING ESSENTIALLY OF AT LEAST ABOUT 70% STABILIZED ZIRCONIA, SAID SHAPE IMPREGNATED THROUGHOUT ITS EXTENSIVE INTERCONNECTED PORE SPACE WITH CARBON SUBSTANTIALLY FREE OF VOLATILE COMPONENTS, SAID SHAPE CHARACTERIZED BY SUBSTANTIAL RESISTANCE TO DESTABILIZATION OF THE ZIRCONIA CONSISTUTING IT.
References Cited (Backward Citations)
US2910371A
Cited
US2952605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |