US2685528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recrystallized alumina pebbles
Assignee: —
•
Filing: —
•
Granted: 1954-08-03
•
Expires: 1971-08-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:07
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B33/00; C04B33/02; C04B33/04; C04B35/1115; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/327; C04B2235/3272; C04B2235/34; C04B2235/3418; C04B2235/3427; C04B2235/3463; C04B2235/349; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5427; C04B2235/5436; C04B2235/70; C04B2235/72; C04B2235/94
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
161 words
A PROCESS FOR MANUFACTURING STABILIZED RECRYSTALLIZED ALUMINA PEBBLES WHICH COMPRISES FIRING AT A TEMPERATURE IN THE RANGE OF 3150 TO 3300* F. FOR AT LEAST 3 HOURS AND UNTIL THE ALUMINA CRYSTALS ARE OF AN AVERAGE SIZE OF AT LEAST 60 MICRONS, AN INTIMATE MIXTURE OF 90 TO 99 WEIGHT PER CENT ALUMINA AND AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF BEO, CR2O3, FE2O3, MIN2O3, AND TI2O3 IN AN AMOUNT IN THE RANGE OF 0.1 TO 10 WEIGHT PER CENT; FINELY COMMINUTING THE RESULTING ALUMINA MASS; FORMING A PLASTIC COMPACTABLE MIX CONSISTING ESSENTIALLY OF THE FINELY COMMINUTED FIRED ALUMINA, A PLASTICIZING AGENT, AND ALUMINUM SILICATE IN AN AMOUNT IN THE RANGE OF 2 TO 20 WEIGHT PER CENT OF THE ALUMINA; COMPACTING SAID MIX INTO SMALL SPHERES; AND FIRING SAID SPHERES AT A TEMPERATURE IN THE RANGE OF 2900 AND 3200* F. FOR AT LEAST 2 HOURS AND UNTIL THEIR POROSITY LIES IN THE RANGE OF 6 TO 18%.
Claim 2
Dependent Claim
161 words
A PROCESS FOR MANUFACTURING STABILIZED RECRYSTALLIZED ALUMINA PEBBLES WHICH COMPRISES FIRING AT A TEMPERATURE IN THE RANGE OF 3150 TO 3300* F. FOR AT LEAST 3 HOURS AND UNTIL THE ALUMINA CRYSTALS ARE OF AN AVERAGE SIZE OF AT LEAST 60 MICRONS, AN INTIMATE MIXTURE OF 90 TO 99 WEIGHT PER CENT ALUMINA AND AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF BEO, CR2O3, FE2O3, MIN2O3, AND TI2O3 IN AN AMOUNT IN THE RANGE OF 0.1 TO 10 WEIGHT PER CENT; FINELY COMMINUTING THE RESULTING ALUMINA MASS; FORMING A PLASTIC COMPACTABLE MIX CONSISTING ESSENTIALLY OF THE FINELY COMMINUTED FIRED ALUMINA, A PLASTICIZING AGENT, AND ALUMINUM SILICATE IN AN AMOUNT IN THE RANGE OF 2 TO 20 WEIGHT PER CENT OF THE ALUMINA; COMPACTING SAID MIX INTO SMALL SPHERES; AND FIRING SAID SPHERES AT A TEMPERATURE IN THE RANGE OF 2900 AND 3200* F. FOR AT LEAST 2 HOURS AND UNTIL THEIR POROSITY LIES IN THE RANGE OF 6 TO 18%.
Claim 3
Dependent Claim
8 words
MULLITE-BONDED STABILIZED BY THE PROCESS OF CLAIM 1.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |