US2672671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina-mullite pebbles
Assignee: Phillips Petroleum Co
•
Filing: 1952-11-13
•
Granted: 1954-03-23
•
Expires: 1972-11-13
Abstract
No abstract record available.
Inventors
- 👤 Sam P Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:32
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS FOR MANUFACTURING MULLITEALUMINA PEBBLES HAVING HIGH RESISTANCE TO BREAKAGE UNDER SEVERE CONDITIONS OF CYCLIC THERMAL AND MECHANICAL SHOCK, WHICH COMPRISES COMPACTING SPHERES FROM A HOMOGENEOUS PLASTIC MIX OF 150 TO 400 MESH ALUMINA AND ALUMINUM SILICATE IN WHICH THE SILICA IS IN A MOL RATIO TO THE ALUMINA OF LESS THAN 2 TO 3; DRYING SAID SPHERES; AND CALCINING THE DRIED SPHERES AT A TEMPERATURE BETWEEN 2900* AND 3200* F. FOR AT LEAST 2 HOURS AND UNTIL THEIR POROSITY LIES BETWEEN 5 AND 20%.
Claim 2
Dependent Claim
86 words
A PROCESS FOR MANUFACTURING MULLITEALUMINA PEBBLES HAVING HIGH RESISTANCE TO BREAKAGE UNDER SEVERE CONDITIONS OF CYCLIC THERMAL AND MECHANICAL SHOCK, WHICH COMPRISES COMPACTING SPHERES FROM A HOMOGENEOUS PLASTIC MIX OF 150 TO 400 MESH ALUMINA AND ALUMINUM SILICATE IN WHICH THE SILICA IS IN A MOL RATIO TO THE ALUMINA OF LESS THAN 2 TO 3; DRYING SAID SPHERES; AND CALCINING THE DRIED SPHERES AT A TEMPERATURE BETWEEN 2900* AND 3200* F. FOR AT LEAST 2 HOURS AND UNTIL THEIR POROSITY LIES BETWEEN 5 AND 20%.
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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) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |