US2680692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized alumina heat exchange
Assignee: —
•
Filing: —
•
Granted: 1954-06-08
•
Expires: 1971-06-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:27
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C04B35/66; C04B2111/00; C04B2111/20; C04B2111/28; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3217; C04B2235/34; C04B2235/3418; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5427; C04B2235/5436; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/96; C04B2235/9607
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A PROCESS FOR MANUFACTURING HEAT-EXCHANGE PEBBLES WHICH COMPRISES PREPARING A PLASTIC HOMOGENEOUS MIX OF POWDERED ALUMINA PREFIRED IN THE RANGE OF 1000 TO 2500* F., POWDERED SILICIA, AND AT LEAST ONE POWERED METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE AND CALCIUM OXIDE TOGETHER WITH A VOLATILE PLASTICIZING BINDER, THE METAL OXIDE AND SILICA IN THE MIX BEING IN STOICHIOMETRIC PROPORTIONS TO FORM SILICATES IN AN AMOUNT IN THE RANGE OF 0.5 TO 10 WEIGHT PER CENT OF THE ALUMINA, FORMING SAID MIX INTO SMALL COMPACT SPHERES, FIRING SAID SPHERES AT A TEMPERATURE IN THE RANGE OF 2850 TO 3200* F., FFOR A POROSITY OF THE SPHERES LIES IN THE RANGE UNTIL THE POROSITY OF THE SPHERES LIES IN THE RANGE OF 5 TO 16%.
Claim 2
Dependent Claim
127 words
A PROCESS FOR MANUFACTURING HEAT-EXCHANGE PEBBLES WHICH COMPRISES PREPARING A PLASTIC HOMOGENEOUS MIX OF POWDERED ALUMINA PREFIRED IN THE RANGE OF 1000 TO 2500* F., POWDERED SILICIA, AND AT LEAST ONE POWERED METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE AND CALCIUM OXIDE TOGETHER WITH A VOLATILE PLASTICIZING BINDER, THE METAL OXIDE AND SILICA IN THE MIX BEING IN STOICHIOMETRIC PROPORTIONS TO FORM SILICATES IN AN AMOUNT IN THE RANGE OF 0.5 TO 10 WEIGHT PER CENT OF THE ALUMINA, FORMING SAID MIX INTO SMALL COMPACT SPHERES, FIRING SAID SPHERES AT A TEMPERATURE IN THE RANGE OF 2850 TO 3200* F., FFOR A POROSITY OF THE SPHERES LIES IN THE RANGE UNTIL THE POROSITY OF THE SPHERES LIES IN THE RANGE OF 5 TO 16%.
References Cited (Backward Citations)
US2391454A
Cited
US2108513A
Cited
US2348847A
Cited
US2423958A
Cited
US2494277A
Cited
US2494276A
Cited
US1178667A
Cited
US2046764A
Cited
US2045494A
Cited
US2304133A
Cited
US2478757A
Cited
US2460811A
Cited
US2448257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |