US3180743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory and method of making same
Assignee: Harbison Walker Refractories Co
•
Filing: 1962-03-29
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Granted: 1965-04-27
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Davies Ben
- 👤 Frank H Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/42; C04B35/12; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A REFRACTORY SHAPE MADE FROM A SIZE GRADED, REFRACTORY BRICKMAKING BATCH, SAID BATCH CONSISTING ESSENTIALLY OF A MAJOR PORTION OF REFRACTORY AGGREGATE GRAIN, AND A MINOR PORTION OF FINELY DIVIDED MATERIAL SELECTED FROM THE GROUP CONSISTING OF LOW SILICA REFRACTORY CHROME ORE, HIGH PURITY MAGNESIA, AND MIXTURES THEREOF, SAID MAGNESIA BEING OF AT LEAST 95% MGO CONTENT, BY WEIGHT AND ON THE BASIS OF AN OXIDE ANALYSIS; SAID AGGREGATE GRAIN CONSTITUTING SUBSTANTIALLY THE ENTIRE COARSE FRACTION OF THE BATCH AND CHARACTERIZED BY A COMBINATION OF RELATIVELY COARSE CHROME ORE PARTICLES AND RELATIVELY FINE MAGNESIA PARTICLES DIRECTLY ATTACHED TO EACH OTHER, THE AREA OF ATTACHMENT OF THE PARTICLES MICROSCOPICALLY CHARACTERIZED AS A HETEROGENEOUS SOLID SOLUTION OF CHROME ORE SPINEL AND MAGNESIA CRYSTALS, SAID PARTICLES BEING SUBSTANTIALLY FREE OF SILICATE FILMING, SAID SHAPE BEING FIRED AT A TEMPERATURE BETWEEN 2800 AND 3050*F.
Claim 2
Dependent Claim
140 words
A REFRACTORY SHAPE MADE FROM A SIZE GRADED, REFRACTORY BRICKMAKING BATCH, SAID BATCH CONSISTING ESSENTIALLY OF A MAJOR PORTION OF REFRACTORY AGGREGATE GRAIN, AND A MINOR PORTION OF FINELY DIVIDED MATERIAL SELECTED FROM THE GROUP CONSISTING OF LOW SILICA REFRACTORY CHROME ORE, HIGH PURITY MAGNESIA, AND MIXTURES THEREOF, SAID MAGNESIA BEING OF AT LEAST 95% MGO CONTENT, BY WEIGHT AND ON THE BASIS OF AN OXIDE ANALYSIS; SAID AGGREGATE GRAIN CONSTITUTING SUBSTANTIALLY THE ENTIRE COARSE FRACTION OF THE BATCH AND CHARACTERIZED BY A COMBINATION OF RELATIVELY COARSE CHROME ORE PARTICLES AND RELATIVELY FINE MAGNESIA PARTICLES DIRECTLY ATTACHED TO EACH OTHER, THE AREA OF ATTACHMENT OF THE PARTICLES MICROSCOPICALLY CHARACTERIZED AS A HETEROGENEOUS SOLID SOLUTION OF CHROME ORE SPINEL AND MAGNESIA CRYSTALS, SAID PARTICLES BEING SUBSTANTIALLY FREE OF SILICATE FILMING, SAID SHAPE BEING FIRED AT A TEMPERATURE BETWEEN 2800 AND 3050*F.
References Cited (Backward Citations)
US3108007A
Cited
US2060697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |