US2563650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hardening bauxite with colloidal silica
Assignee: Porocel Industries LLC
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Filing: 1949-04-26
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Granted: 1951-08-07
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Expires: 1969-04-26
Abstract
No abstract record available.
Inventors
- 👤 Heinemann Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:28
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/12; B01J21/00; B01J21/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A METHOD FOR HARDENING THERMALLY ACTIVATED BAUXITE GRANULES HAVING AN AVERAGE PORE DIAMETER BETWEEN 50 AND 100 A. WITHOUT SUBSTANTIALLY REDUCING THE SURFACE AREA OF SAID GRANLES, WHICH COMPRISES TREATING SAID GRANULES WITH A COLLOIDAL SOLUTION OF SILICA OF AN AVERAGE PARTICLE SIZE BETWEEN 100 AND 600 A. HAVING A PH BETWEEN 9.5 AND 10.5 IN AN AMOUNT SUFFICIENT TO GIVE BETWEEN 1% AND 8% OF SILICA IN THE BAUXITE GRANULES, AND PRECIPITATING THE SILICA IN THE GRANULES.
Claim 2
Independent Claim
78 words
A METHOD FOR HARDENING THERMALLY ACTIVATED BAUXITE GRANULES HAVING AN AVERAGE PORE DIAMETER BETWEEN 50 AND 100 A. WITHOUT SUBSTANTIALLY REDUCING THE SURFACE AREA OF SAID GRANLES, WHICH COMPRISES TREATING SAID GRANULES WITH A COLLOIDAL SOLUTION OF SILICA OF AN AVERAGE PARTICLE SIZE BETWEEN 100 AND 600 A. HAVING A PH BETWEEN 9.5 AND 10.5 IN AN AMOUNT SUFFICIENT TO GIVE BETWEEN 1% AND 8% OF SILICA IN THE BAUXITE GRANULES, AND PRECIPITATING THE SILICA IN THE GRANULES.
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) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |