Patent US2516249A successfully refreshed from Google Patents.
US2516249A
Expired / Lapsed
US
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Forsterite refractory made from natural magnesium silicates
Assignee: Harbison Walker Refractories Co
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Filing: 1948-11-12
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Granted: 1950-07-25
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Expires: 1968-11-12
Abstract
No abstract record available.
Inventors
- 👤 Elburt F Osborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:41
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
IN THE PRODUCTION OF FORSTERITIC REFRACTORY SHAPES FROM MIXTURES OF NATURAL MAGNESIUM SILICATE AND DEAD BURNED MAGNESITE, THE METHOD OF STABLIZING THE SHAPES AGAINST DETERIORATION WHEN EXPOSED CYCLICALLY AT ELEVATED TEMPERATURES ALTERNATELY TO OXIDIZING AND REDUCING ATMOSPHERES THAT COMPRISES ADDING AN ALUMINA-RICH MATERIAL TO SAID MIXTURE TO SUPPLY FROM ABOUT 5 TO 25 PER CENT OF FREE ALUMINA THERETO.
Claim 2
Dependent Claim
59 words
IN THE PRODUCTION OF FORSTERITIC REFRACTORY SHAPES FROM MIXTURES OF NATURAL MAGNESIUM SILICATE AND DEAD BURNED MAGNESITE, THE METHOD OF STABLIZING THE SHAPES AGAINST DETERIORATION WHEN EXPOSED CYCLICALLY AT ELEVATED TEMPERATURES ALTERNATELY TO OXIDIZING AND REDUCING ATMOSPHERES THAT COMPRISES ADDING AN ALUMINA-RICH MATERIAL TO SAID MIXTURE TO SUPPLY FROM ABOUT 5 TO 25 PER CENT OF FREE ALUMINA THERETO.
References Cited (Backward Citations)
US2315198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |