US2660537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonded refractory and its manufacture
Assignee: Illinois Clay Products Co
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Filing: 1950-02-23
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Granted: 1953-11-24
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Expires: 1970-02-23
Abstract
No abstract record available.
Inventors
- 👤 Howard F West
- 👤 John H Veale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:43
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
THE METHOD OF MAKING UNFIRED SILICA BRICK WHICH COMPRISES MIXING GRANULAR SILICA AND CONCENTRATED SULPHURIC ACID SO AS THOROUGHLY TO DISTRIBUTE THE ACID THROUGHOUT THE GRAINS OF SILICA, AND THEN MIXING THE SAME WITH A QUANTITY OF CLAY, THE RATIO OF THE SEVERAL CONSITUENTS BEING 60 TO 85% SILICA, 40 TO 15% CLAY AND 2 TO 9% ON THE AMOUNT OF CLAY OF CONCENTRATED SULPHURIC ACID, FORMING THE MIXTURE, AND THEN HEATING THE FORMED ARTICLES AT TEMPERATURES SUBSTANTIALLY ABOVE 212* F. TO FORM ACID ALUMINUM SULPHATE BONDS AND MAINTAINING THE TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF SAID SULPHATE BONDS.
Claim 2
Independent Claim
99 words
THE METHOD OF MAKING UNFIRED SILICA BRICK WHICH COMPRISES MIXING GRANULAR SILICA AND CONCENTRATED SULPHURIC ACID SO AS THOROUGHLY TO DISTRIBUTE THE ACID THROUGHOUT THE GRAINS OF SILICA, AND THEN MIXING THE SAME WITH A QUANTITY OF CLAY, THE RATIO OF THE SEVERAL CONSITUENTS BEING 60 TO 85% SILICA, 40 TO 15% CLAY AND 2 TO 9% ON THE AMOUNT OF CLAY OF CONCENTRATED SULPHURIC ACID, FORMING THE MIXTURE, AND THEN HEATING THE FORMED ARTICLES AT TEMPERATURES SUBSTANTIALLY ABOVE 212* F. TO FORM ACID ALUMINUM SULPHATE BONDS AND MAINTAINING THE TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF SAID SULPHATE BONDS.
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) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |