US3262795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basic fused refractory
Assignee: Harbison Walker Refractories Co
•
Filing: 1964-06-24
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Granted: 1966-07-26
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Expires: 1984-06-24
Abstract
No abstract record available.
Inventors
- 👤 Davies Ben
- 👤 Ernest P Weaver
- 👤 Peter H Havranek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:01
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A FIRED REFRACTORY SHAPE TO BE EXPOSED TO VERY HIGH TEMPERATURES, SAID SHAPE MADE OF BASIC REFRACTORY PARTICLES, SAID PARTICLES MADE FROM A MELTED, RESOLIDIFIED AND CRUSHED MIXTURE OF MATERIAL SELECTED FROM THE GROUP CONSISTING OF SENTIALY OF DOLOMITE, LIME, AND MAGNESIA, AND ANALYZING, BY WEIGHT OF AN OXIDE BASIS, AT LEAST 96% MGO+CAO, THE MGO RANGING FROM ABOUT 95 TO 50% AND THE CAO RANGING FROM AT LEAST 5 TO ABOUT 50%, THE REMAIDER CONSISTING ESSENTIALLY OF SIO2, AL2O3, AND FE2O3, SAID PARTICLES BEING HIGHLY CRYSTALLINE AND CHARACTERIZED BY SUBSTANTIALLY FREEDOM FROM AMORLPHOUS VITRIFIED PHASES AND SPINELS, SAID VETRIFIED PHASES AND SPINELS PRESENT ONLY AS DISCONTINUOUS FILMS AND POCKETS DISTRIBUTED THROUGH THE CRYSTALLINE STRUCTURE OF THE PARTICLES.
Claim 2
Dependent Claim
118 words
A FIRED REFRACTORY SHAPE TO BE EXPOSED TO VERY HIGH TEMPERATURES, SAID SHAPE MADE OF BASIC REFRACTORY PARTICLES, SAID PARTICLES MADE FROM A MELTED, RESOLIDIFIED AND CRUSHED MIXTURE OF MATERIAL SELECTED FROM THE GROUP CONSISTING OF SENTIALY OF DOLOMITE, LIME, AND MAGNESIA, AND ANALYZING, BY WEIGHT OF AN OXIDE BASIS, AT LEAST 96% MGO+CAO, THE MGO RANGING FROM ABOUT 95 TO 50% AND THE CAO RANGING FROM AT LEAST 5 TO ABOUT 50%, THE REMAIDER CONSISTING ESSENTIALLY OF SIO2, AL2O3, AND FE2O3, SAID PARTICLES BEING HIGHLY CRYSTALLINE AND CHARACTERIZED BY SUBSTANTIALLY FREEDOM FROM AMORLPHOUS VITRIFIED PHASES AND SPINELS, SAID VETRIFIED PHASES AND SPINELS PRESENT ONLY AS DISCONTINUOUS FILMS AND POCKETS DISTRIBUTED THROUGH THE CRYSTALLINE STRUCTURE OF THE PARTICLES.
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) | 1969-07-25 | 1970-01-24 | 1970-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-25 | 1974-01-24 | 1974-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-25 | 1978-01-24 | 1978-07-26 | $7700.00 | Window Closed / Lapsed |