Patent US2899323A successfully refreshed from Google Patents.
US2899323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange pebbles
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
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Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:09
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A PROCESS FOR MAKING HEAT EXCHANGE MATERIAL CAPABLE OF WITHSTANDING MECHANICAL AND THERMAL SHOCK AT ELEVATED TEMPERATURES COMPRISING PREPARING A HOMOGENEOUS MIXTURE F ALUMINA, SILICA, AND AT LEAST ONE MEMBER OF A COMPOUND OF A METAL OF THE GROUP CONSISTING OF MANGANESE AND IRON WHICH IS IN THE OXIDE FORM AFTER, FIRING, THE AMOUNTS OF THE CONSTITUENT OF SAID MIXTURE BEING SELECTED SO THAT SAID MATERIAL CONTAINS SILICA IN THE RANGE OF 1.0 TO 7.0 WEIGHT PERCENT, THE OXIDE OF SAID MEMBER IN THE RANGE OF 0.05 TO 1.5 WEIGHT PERCENT, AND THE BALANCE OF ALUMINA; FORMING SAID MIXTURE INTO DESIRED SHAPES WITH THE ACID OF AN ORGANIC BINDER BEFORE FIRING; AND THEREAFTER FIRING SAID ARTICLES AT A TEMPERATURE IN THE RANGE OF 3050 TO 3200*F. FOR A PERIOD OF AT LEAST 2 HOURS SO AS TO PROMOTE CRYSTAL GROWTH OF A-ALUMINA AND DEVELOP LATH-LIKE CRYSTALLITES OF A-ALUMINA THEREIN.
Claim 2
Dependent Claim
149 words
A PROCESS FOR MAKING HEAT EXCHANGE MATERIAL CAPABLE OF WITHSTANDING MECHANICAL AND THERMAL SHOCK AT ELEVATED TEMPERATURES COMPRISING PREPARING A HOMOGENEOUS MIXTURE F ALUMINA, SILICA, AND AT LEAST ONE MEMBER OF A COMPOUND OF A METAL OF THE GROUP CONSISTING OF MANGANESE AND IRON WHICH IS IN THE OXIDE FORM AFTER, FIRING, THE AMOUNTS OF THE CONSTITUENT OF SAID MIXTURE BEING SELECTED SO THAT SAID MATERIAL CONTAINS SILICA IN THE RANGE OF 1.0 TO 7.0 WEIGHT PERCENT, THE OXIDE OF SAID MEMBER IN THE RANGE OF 0.05 TO 1.5 WEIGHT PERCENT, AND THE BALANCE OF ALUMINA; FORMING SAID MIXTURE INTO DESIRED SHAPES WITH THE ACID OF AN ORGANIC BINDER BEFORE FIRING; AND THEREAFTER FIRING SAID ARTICLES AT A TEMPERATURE IN THE RANGE OF 3050 TO 3200*F. FOR A PERIOD OF AT LEAST 2 HOURS SO AS TO PROMOTE CRYSTAL GROWTH OF A-ALUMINA AND DEVELOP LATH-LIKE CRYSTALLITES OF A-ALUMINA THEREIN.
References Cited (Backward Citations)
US2685528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |