Patent US3909454A successfully refreshed from Google Patents.
US3909454A
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US
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Method for activation of bentonites
Assignee: Individual
•
Filing: 1974-02-25
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Granted: 1975-09-30
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Expires: 1994-02-25
Abstract
Abstract A method for activation of bentonites is described. The method comprises a prior treatment of the bentonite with an organic polymer and/or an aqueous alkaline solution as known from prior art. Subsequently, an amount of 0.01 - 10% by weight from the treated bentonite of a heavy metal salt is incorporated into the pretreated bentonite and then dried at a temperature not higher than 400*C. The cation in the heavy metal salt is selected from Fe, Ni, Zn, Co, Cr, and Mn.
Inventors
- 👤 Weisz Anat Azrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:44
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/42; A; A01; A01N; A01N25/00; A01N25/08; A61; A61K; A61K47/00; A61K47/02; C01B33/26; C01B33/40; C01B33/46; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/16; Y; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/507; Y10S507/00; Y10S507/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A METHOD FOR THE ACTIVATION OF BENTRONITE WHICH COMPRISES TREATING THE BENTRONITE WITH 0.25-10% BY WEIGHT OF BENTRONITE OF AN ORGANIC POLYMER AND AN AQUEOUS ALKALINE SOLUTION, BOTH KNOWN, THE IMPROVEMENT BEING THE INCORPORATION INTO THE TREATED BENTONITE OF AN AMOUNT OF 0.01-10% BY WEIGHT FROM THE PRETREATED BENTONITE OF A HEAVY METAL SALT SELECTED FROM SALTS OF FE, NI, ZN, CO, CR AND MN AND DYING THE ACTIVATED BENTONITE MASS AT A TEMPERATURE NOT HIGHER THAN 400*C.
Claim 2
Independent Claim
78 words
A METHOD FOR THE ACTIVATION OF BENTRONITE WHICH COMPRISES TREATING THE BENTRONITE WITH 0.25-10% BY WEIGHT OF BENTRONITE OF AN ORGANIC POLYMER AND AN AQUEOUS ALKALINE SOLUTION, BOTH KNOWN, THE IMPROVEMENT BEING THE INCORPORATION INTO THE TREATED BENTONITE OF AN AMOUNT OF 0.01-10% BY WEIGHT FROM THE PRETREATED BENTONITE OF A HEAVY METAL SALT SELECTED FROM SALTS OF FE, NI, ZN, CO, CR AND MN AND DYING THE ACTIVATED BENTONITE MASS AT A TEMPERATURE NOT HIGHER THAN 400*C.
Claim 3
Dependent Claim
25 words
A method for the activation of bentonite according to claim 1 wherein the organic polymer is selected from carboxymethyl cellulose, starch, acrylo-polymers and polyethylene oxide.
Claim 4
Dependent Claim
26 words
A method for the activation of bentonite according to claim 1 wherein the alkaline solution is selected from sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate.
Claim 5
Dependent Claim
31 words
A method for the activation of bentonite according to claim 3 wherein the amount of alkali is in the range of 0.2-10% by weight of the bentonite-organic polymer mass or bentonite.
Claim 6
Dependent Claim
22 words
A method for the activation of bentonite according to claim 1 wherein the heavy metal salt is added as an aqueous solution.
Claim 7
Dependent Claim
30 words
A method for the activation of bentonite according to claim 1 wherein the amount of heavy metal salt is in the range of 0.1-5% by weight of the pretreated bentonite.
Claim 8
Dependent Claim
25 words
A method for the activation of bentonite according to claim 1 wherein the activated bentonite is dried in a dryer heated by infra red lamps.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |