Patent US2988519A successfully refreshed from Google Patents.
US2988519A
Expired / Lapsed
US
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Activation of clay by acid treatment and calcination in the presence of carbonaceous aterial
Assignee: Minerals and Chemicals Philipp Corp
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Filing: 1955-10-18
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Granted: 1961-06-13
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Expires: 1975-10-18
Abstract
No abstract record available.
Inventors
- 👤 Alfred J Robinson
- 👤 James V Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:07
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR THE PREPARATION OF ADSORPTIVE CONTACT MASSES FROM AN ACID ACTIVATABLE CLAY COMPRISING THE STEPS OF MIXING SAID CLAY WITH SULFURIC ACID IN AN AMOUNT OF FROM 60 PER CENT TO 100 PERCENT BY WEIGHT BASED ON THE VOLATILE FREE WEIGHT OF SAID CLAY AND WITH FROM 3 TO 20 PARTS BY WEIGHT OF A CARBONACEOUS MATERIAL PER 100 PARTS OF SAID SULFURIC ACID, FORMING SHAPED MASSES FROM THE RESULTING MIXTURE, REACTING SAID CLAY WITH SAID SULFURIC ACID, AND THEN, WITHOUT WASHING OUT WATER SOLUBLE REACTION PRODUCTS, DESULFATING THE REACTED MIXTURE BY CALCINING SAID MIXTURE IN AN ATMOSPHERE SUCH AS TO AVOID DIRECT COMBUSTION OF THE CARBONACEOUS MATERIAL TO CO2.
Claim 2
Dependent Claim
112 words
A PROCESS FOR THE PREPARATION OF ADSORPTIVE CONTACT MASSES FROM AN ACID ACTIVATABLE CLAY COMPRISING THE STEPS OF MIXING SAID CLAY WITH SULFURIC ACID IN AN AMOUNT OF FROM 60 PER CENT TO 100 PERCENT BY WEIGHT BASED ON THE VOLATILE FREE WEIGHT OF SAID CLAY AND WITH FROM 3 TO 20 PARTS BY WEIGHT OF A CARBONACEOUS MATERIAL PER 100 PARTS OF SAID SULFURIC ACID, FORMING SHAPED MASSES FROM THE RESULTING MIXTURE, REACTING SAID CLAY WITH SAID SULFURIC ACID, AND THEN, WITHOUT WASHING OUT WATER SOLUBLE REACTION PRODUCTS, DESULFATING THE REACTED MIXTURE BY CALCINING SAID MIXTURE IN AN ATMOSPHERE SUCH AS TO AVOID DIRECT COMBUSTION OF THE CARBONACEOUS MATERIAL TO CO2.
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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) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |