US3174826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating attapulgite clay to produce a low bulk density product
Assignee: BASF Catalysts LLC
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Filing: 1962-10-04
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Granted: 1965-03-23
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Expires: 1982-10-04
Abstract
No abstract record available.
Inventors
- 👤 Aldo P Allegrini
- 👤 Tom A Cecil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:54
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD FOR TREATING ATTAPULGITE CLAY TO PRODUCE THEREFROM A LOW BULK DENSITY ATTAPULGITE CLAY PRODUCT WHICH COMPRISES PROVIDING A COLLOIDAL AQUEOUS DISPERSION OF ATTAPULGITE CLAY CONTAINING (A) TETRASODIUM PYROPHOSPHATE IN AN AMOUNT SUFFICIENT TO DEFLOCCULATE SAID CLAY AND (B) SODIUM HYDROXIDE IN AMOUNT SUFFICIENT TO PROVIDE A CLAY DISPERSION HVING A PH OF 10 TO 12, AGING SAID DISPERSION AT AMBIENT TEMPERATURE FOR AT LEAST 48 HOURS, EVAPORATING WATER FROM SAID DISPERSION WHILE MAINTAINING SAID DISPERSION QUIESCENT UNTIL A MASS OF GRINDABLE CONSISTENCY IS OBTAINED AND GRINDING SAID MASS. SAID AGING OF THE CLAY DISPERSION BEING CARRIED OUT FOR A TIME SUCH THAT THE TAMPED BULK DENSITY OF THE GROUND MATERIAL IS LESS THAN THE TAMPED BULK DENSITY OF THE GROUND MATERIAL THAT IS PRODUCED WHEN THE AGING STEP IS OMITTED.
Claim 2
Independent Claim
132 words
A METHOD FOR TREATING ATTAPULGITE CLAY TO PRODUCE THEREFROM A LOW BULK DENSITY ATTAPULGITE CLAY PRODUCT WHICH COMPRISES PROVIDING A COLLOIDAL AQUEOUS DISPERSION OF ATTAPULGITE CLAY CONTAINING (A) TETRASODIUM PYROPHOSPHATE IN AN AMOUNT SUFFICIENT TO DEFLOCCULATE SAID CLAY AND (B) SODIUM HYDROXIDE IN AMOUNT SUFFICIENT TO PROVIDE A CLAY DISPERSION HVING A PH OF 10 TO 12, AGING SAID DISPERSION AT AMBIENT TEMPERATURE FOR AT LEAST 48 HOURS, EVAPORATING WATER FROM SAID DISPERSION WHILE MAINTAINING SAID DISPERSION QUIESCENT UNTIL A MASS OF GRINDABLE CONSISTENCY IS OBTAINED AND GRINDING SAID MASS. SAID AGING OF THE CLAY DISPERSION BEING CARRIED OUT FOR A TIME SUCH THAT THE TAMPED BULK DENSITY OF THE GROUND MATERIAL IS LESS THAN THE TAMPED BULK DENSITY OF THE GROUND MATERIAL THAT IS PRODUCED WHEN THE AGING STEP IS OMITTED.
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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |