Patent FR1094503A successfully refreshed from Google Patents.
Patent US3993498A successfully refreshed from Google Patents.
US3993498A
Expired / Lapsed
US
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Granular carrier material
Assignee: Cullinan Holdings Ltd
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Filing: 1975-03-31
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Granted: 1976-11-23
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Expires: 1995-03-31
Abstract
Abstract A granular carrier material and process for producing same adapted for use with pesticides. A cake is formed of an intimate mixture of 97-80% by weight attapulgite and 3-20% by weight perlite, the attapulgite and perlite being capable of passing through a 150 ASTM mesh screen. The cake is then heated to a temperature of 450°-780° C. and is broken to form a granular solid.
Inventors
- 👤 Gerald John Koekemoer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:46
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/12; C; C04; C04B; C04B33/00; C04B33/02; C04B33/13
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
107 words
A process for producing a granular carrier material for pesticides from attapulgite which includes the steps of: a. wet mixing perlite and attapulgite together in an aqueous medium to form a cake which comprises an intimate mixture of between 97 and 80% by weight of attapulgite in finely divided form and between 3 and 20% by weight of heat expanded perlite in finely divided form, the attapulgite and perlite being of a particle size capable of passing through a 150 mesh ASTM screen; b. heating the cake to a temperature of between 450° and 780° C; and c. breaking up the cake to form a granular solid.
Claim 2
Dependent Claim
107 words
A process for producing a granular carrier material for pesticides from attapulgite which includes the steps of: a. wet mixing perlite and attapulgite together in an aqueous medium to form a cake which comprises an intimate mixture of between 97 and 80% by weight of attapulgite in finely divided form and between 3 and 20% by weight of heat expanded perlite in finely divided form, the attapulgite and perlite being of a particle size capable of passing through a 150 mesh ASTM screen; b. heating the cake to a temperature of between 450° and 780° C; and c. breaking up the cake to form a granular solid.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1, in which the mixture comprises between 92 and 85% by weight attapulgite, and between 8 and 15% by weight perlite.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, in which the cake is heated to a temperature of between 500° and 700° C.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 3, in which the cake is heated to a temperature between 500° and 600° C.
Claim 6
Dependent Claim
36 words
A process as claimed in claim 1, which includes the step of, after heating the mixture, maintaining the mixture at the temperature to which it is heated for a soaking period of up to 3 hours.
Claim 7
Dependent Claim
18 words
A process as claimed in claim 5, in which the soaking period is between 1 and 2 hours.
Claim 8
Dependent Claim
31 words
A process as claimed in claim 1, in which the wet mixing comprises dispersing the components in the aqueous medium, the mixture being separated from the aqueous medium prior to heating.
Claim 9
Dependent Claim
26 words
A process as claimed in claim 7, in which separating the mixture from the aqueous medium is by causing it to settle from the aqueous medium.
Claim 10
Dependent Claim
21 words
A process as claimed in claim 8, in which the settling includes flocculating the components by means of an organic flocculant.
Claim 11
Dependent Claim
41 words
A process as claimed in claim 1 in which the wet mixing includes adding phosphoric acid to the mixture so that the phosphoric acid forms 0.2 to 0.5% by weight of the total weight of the mixture on a dry basis.
Claim 12
Dependent Claim
21 words
A process as claimed in claim 1, whereas the components of the wet mixture are comminuted during said wet mixing step.
Claim 13
Dependent Claim
47 words
A process as claimed in claim 1, in which the particle size of the components in the cake is such that the greater proportion by weight of the particles will pass through a 200 ASTM mesh screen but will be retained by a 600 ASTM mesh screen.
Claim 14
Dependent Claim
41 words
A process as claimed in claim 12, in which the particle size is such that the greater proportion by weight of the particles will pass through a 300 ASTM mesh screen but will be retained by a 400 ASTM mesh screen.
Claim 15
Dependent Claim
60 words
A process as claimed in claim 1, in which the breaking step comprises grinding, the process including the step, after grinding the cake, of classifying the particles formed according to size so that at least 80% by weight of the carrier material will pass through a 20 mesh ASTM screen but will be retained by a 60 mesh ASTM screen.
Claim 16
Dependent Claim
71 words
A process as claimed in claim 14, in which the classifying is by screening and is such to classify the particles into three predetermined fractions according to screen opening size in microns, namely one fraction of particle size -850 + 600, another of particle size -600 + 425 and a third of particle size -425 + 300, the screening being followed by the step of recombining the fractions in equal proportions.
Claim 17
Dependent Claim
30 words
A process as claimed in claim 14, in which all the particles incapable of passing through a 20 mesh ASTM screen are recycled through the grinding step for additional grinding.
Claim 18
Dependent Claim
33 words
A process as claimed in claim 14, in which all the particles capable of passing through a 60 mesh ASTM screen are recycled through the mixing step to form part of the cake.
Claim 19
Dependent Claim
34 words
A process as claimed in claim 1, in which the mixture comprises less than 90% attapulgite and more than 10% perlite, and the heating of the cake is to a temperature above 540° C.
Claim 20
Dependent Claim
93 words
A grannular carrier material for pesticides, which comprises an intimate mixture of between 97 and 80% by weight of attapulgite and between 3 and 20% by weight of heat-expanded perlite, the perlite being in the form of particles having a particle size capable of passing through a 150 mesh ASTM screen, and being randomly dispersed throughout a matrix of attapulgite particles which is formed by heating a wet mix of the perlite and attapulgite particles capable of passing through a 150 mesh ASTM screen to a temperature of between 450° and 780° C.
Claim 21
Dependent Claim
93 words
A grannular carrier material for pesticides, which comprises an intimate mixture of between 97 and 80% by weight of attapulgite and between 3 and 20% by weight of heat-expanded perlite, the perlite being in the form of particles having a particle size capable of passing through a 150 mesh ASTM screen, and being randomly dispersed throughout a matrix of attapulgite particles which is formed by heating a wet mix of the perlite and attapulgite particles capable of passing through a 150 mesh ASTM screen to a temperature of between 450° and 780° C.
Claim 22
Dependent Claim
32 words
A carier material as claimed in claim 19, which comprises less tha 90% attapulgite and more than 10% perlite, the matrix being formed by heating to a temperature of above 540° C.
Claim 23
Dependent Claim
46 words
A carrier material as claimed in claim 20, which is capable of absorbing a liquid comprising 77% by weight of benzyl chloride (alpha chlorotoluene) and 23% by weight of petroleum benzine, to form a freeflowing grannular product comprising at least 30% by weight of the liquid.
Claim 24
Dependent Claim
27 words
A carrier material as claimed in claim 19, which comprises between 92 and 85% by weight of attapulgite, and between 8 and 15% by weight of perlite.
Claim 25
Dependent Claim
24 words
A carrier material as claimed in claim 19, in which the matrix is formed by heating to a temperature between 500° and 700° C.
Claim 26
Dependent Claim
24 words
A carrier material as claimed in claim 19, in which the matrix is formed by heating to a temperature between 500° and 600° C.
Claim 27
Dependent Claim
35 words
A carrier material as claimed in claim 19, in which the matrix is formed by soaking the wet mix at the temperaure to which it is heated for a period of up to 3 hours.
Claim 28
Dependent Claim
19 words
A carrier material as claimed in claim 19, which comprises between 0.2 and 0.5% by weight of phosphoric acid.
Claim 29
Dependent Claim
48 words
A carrier material as claimed in claim 19, which has a particle size distribution such that it comprises three fractions of equal weight, namely one fraction of particle size -850 + 600, another of particle size -600 + 425, and a third of particle size -425 + 300.
References Cited (Backward Citations)
US2363876A
Cited
US2728733A
Cited
US2935267A
Cited
US2967154A
Cited
US3041238A
Cited
US2956016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |