US2633623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mullite-bonded zircon pebbles
Assignee: Phillips Petroleum Co
•
Filing: 1949-07-11
•
Granted: 1953-04-07
•
Expires: 1969-07-11
Abstract
No abstract record available.
Inventors
- 👤 Sam P Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:59
CPC Classifications
B; B01; B01J; B01J21/00; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A PROCESS FOR MANUFACTURING PEBBLES FOR MOVING-BED HEAT-TRANSFER PURPOSES WHICH COMPRISES COMPACTING INTO SMALL DENSE BALLS A HOMOGENEOUS FINELY COMMINUTED PLASTIC MIXTURE CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF ZIRCON, AND THE BALANCE CONSISTING ESSENTIALLY OF A PLASTIC ALUMINUM SILICATE IN WHICH THE MOL RATIO OF SILICA TO ALUMINA IS IN THE RANGE OF 1:1 TO 2:1 AND ALUMINA IN AN AMOUNT IN THE RANGE OF 1 TO 25 WEIGHT PER CENT IN EXCESS OF THAT REQUIRED TO REACT WITH THE SILICA FREED WHEN SAID ALUMINUM SILICATE IS CONVERTED TO MULLITE BY CALCINATION; AND CALCINING THE BALLS AT A TEMPERATURE IN THE RANGE OF 2500* TO 3100* F. FOR AT LEAST 3 HOURS AND UNTIL THEIR POROSITY LIES IN THE RANGE OF 8 TO 15 PER CENT SO AS TO CONVERT ALUMINUM SILICATE TO MULLITE AND REACT FREED SILICA WITH ALUMINA TO FORM ADDITIONAL MULLITE IN THE BALLS AS BONDING AGENT THEREFOR.
Claim 2
Dependent Claim
152 words
A PROCESS FOR MANUFACTURING PEBBLES FOR MOVING-BED HEAT-TRANSFER PURPOSES WHICH COMPRISES COMPACTING INTO SMALL DENSE BALLS A HOMOGENEOUS FINELY COMMINUTED PLASTIC MIXTURE CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF ZIRCON, AND THE BALANCE CONSISTING ESSENTIALLY OF A PLASTIC ALUMINUM SILICATE IN WHICH THE MOL RATIO OF SILICA TO ALUMINA IS IN THE RANGE OF 1:1 TO 2:1 AND ALUMINA IN AN AMOUNT IN THE RANGE OF 1 TO 25 WEIGHT PER CENT IN EXCESS OF THAT REQUIRED TO REACT WITH THE SILICA FREED WHEN SAID ALUMINUM SILICATE IS CONVERTED TO MULLITE BY CALCINATION; AND CALCINING THE BALLS AT A TEMPERATURE IN THE RANGE OF 2500* TO 3100* F. FOR AT LEAST 3 HOURS AND UNTIL THEIR POROSITY LIES IN THE RANGE OF 8 TO 15 PER CENT SO AS TO CONVERT ALUMINUM SILICATE TO MULLITE AND REACT FREED SILICA WITH ALUMINA TO FORM ADDITIONAL MULLITE IN THE BALLS AS BONDING AGENT THEREFOR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |