US3208861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of hydration
Assignee: Harbison Walker Refractories Co
•
Filing: 1963-04-05
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Granted: 1965-09-28
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Expires: 1983-04-05
Abstract
No abstract record available.
Inventors
- 👤 George R Henry
- 👤 Donald F King
- 👤 Davies Ben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/04; C04B35/043; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
IN UNCONSOLIDATED UNFIRED REFRACTORY SPECIALTIES CONSISTING OF A SIZE GRADED BATCH MIXTURE OF DRY REFRACTORY PARTICLES HAVING A COARSE FRACTION HELD ON 65 MESH AND A FINE FRACTION PASSING 65 MESH, SAID COARSE FRACTION SELECTED FROM THE GROUP CONSISTING OF CALCINED BAUXITE, CALCINED DISAPORE, KYANITE, ZIRCONIA, SILICON CARBIDE, TRANSVAAL AND PHILIPPINE CHROME ORE, OLIVINE, REFRACTORY ALUMINAS AND DEAD BURNED MAGNESITE, SAID FINE FRACTION BEING FROM 10 TO 40%, BY WEIGHT, BASED ON THE TOTAL BATCH WEIGHT, OF THE DEAD BURNED MAGNESITE AND IT BEING OF AT LEAST ABOUT 90% MGO CONTENT, THE IMPROVEMENT WHICH CONSISTS OF THE FOLLOWING TO PROMOTE RESISTANCE TO HYDRATION AND INCREASED STRENGTH: (A) SAID BATCH INCLUDING, (A) FROM 1 TO 5% OF A - 65 MESH SODIUM SILICATE WHICH IS NO MORE ALKALINE THAN ONE HAVING ONE MOLE OF NA2O AND THREE MOLES OF SIO2, (B) FROM 1 TO 5% OF VOLATILIZED SILICA, (C) FROM 0.1 TO 1% OF SODIUM PYROPHOSPHATE, (B) THE MAGNESITE BEING SUPER BALL MILL FINES.
Claim 2
Dependent Claim
163 words
IN UNCONSOLIDATED UNFIRED REFRACTORY SPECIALTIES CONSISTING OF A SIZE GRADED BATCH MIXTURE OF DRY REFRACTORY PARTICLES HAVING A COARSE FRACTION HELD ON 65 MESH AND A FINE FRACTION PASSING 65 MESH, SAID COARSE FRACTION SELECTED FROM THE GROUP CONSISTING OF CALCINED BAUXITE, CALCINED DISAPORE, KYANITE, ZIRCONIA, SILICON CARBIDE, TRANSVAAL AND PHILIPPINE CHROME ORE, OLIVINE, REFRACTORY ALUMINAS AND DEAD BURNED MAGNESITE, SAID FINE FRACTION BEING FROM 10 TO 40%, BY WEIGHT, BASED ON THE TOTAL BATCH WEIGHT, OF THE DEAD BURNED MAGNESITE AND IT BEING OF AT LEAST ABOUT 90% MGO CONTENT, THE IMPROVEMENT WHICH CONSISTS OF THE FOLLOWING TO PROMOTE RESISTANCE TO HYDRATION AND INCREASED STRENGTH: (A) SAID BATCH INCLUDING, (A) FROM 1 TO 5% OF A - 65 MESH SODIUM SILICATE WHICH IS NO MORE ALKALINE THAN ONE HAVING ONE MOLE OF NA2O AND THREE MOLES OF SIO2, (B) FROM 1 TO 5% OF VOLATILIZED SILICA, (C) FROM 0.1 TO 1% OF SODIUM PYROPHOSPHATE, (B) THE MAGNESITE BEING SUPER BALL MILL FINES.
References Cited (Backward Citations)
US2947649A
Cited
US3075848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |