Patent US2967157A successfully refreshed from Google Patents.
US2967157A
Expired / Lapsed
US
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Activation of clay by acid treatment and calcination
Assignee: Minerals and Chemicals Philipp Corp
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Filing: 1955-02-23
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Granted: 1961-01-03
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Expires: 1975-02-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred J Robinson
- 👤 James V Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:41
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD FOR THE PREPARATION OF ADSORPTIVE CONTACT MASSES FROM KAOLIN CLAY COMPRISING REACTING KAOLIN CLAY WITH SULFURIC ACID IN AN AMOUNT OF FROM 60% TO 125% BASED ON THE VOLATILE FREE WEIGHT OF SAID KAOLIN CLAY, AND THEN, WITHOUT WASHING OUT WATER SOLUBLE REACTION PRODUCTS, CALCINING THE REACTED MIXTURE AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO SUBSTANTIALLY ELIMINATE SULFATE THEREFROM.
Claim 2
Independent Claim
63 words
A METHOD FOR THE PREPARATION OF ADSORPTIVE CONTACT MASSES FROM KAOLIN CLAY COMPRISING REACTING KAOLIN CLAY WITH SULFURIC ACID IN AN AMOUNT OF FROM 60% TO 125% BASED ON THE VOLATILE FREE WEIGHT OF SAID KAOLIN CLAY, AND THEN, WITHOUT WASHING OUT WATER SOLUBLE REACTION PRODUCTS, CALCINING THE REACTED MIXTURE AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO SUBSTANTIALLY ELIMINATE SULFATE THEREFROM.
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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) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |