US4309477A
Expired / Lapsed
US
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Asbestos treatment with metal sulfides
Assignee: Dow Chemical Co
•
Filing: 1977-01-03
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Granted: 1982-01-05
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Expires: 1997-01-03
Abstract
Abstract A method of treating asbestos comprising depositing on at least a portion of the asbestos a material consisting essentially of at least one metal sulfide.
Inventors
- 👤 Paul A. Pezzoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:22
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/02; D02G3/16; D02G3/20; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2933; Y10T428/2938; Y10T428/294; Y10T428/2942; Y10T428/31504; Y10T428/31652
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
38 words
A method of treating asbestos comprising depositing on at least a portion of the asbestos a material consisting essentially of at least one metal sulfide to provide an asbestos material having lower hemolytic activity than the untreated asbestos.
Claim 2
Independent Claim
38 words
A method of treating asbestos comprising depositing on at least a portion of the asbestos a material consisting essentially of at least one metal sulfide to provide an asbestos material having lower hemolytic activity than the untreated asbestos.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein the metal is selected from the group consisting of alkaline earth metals, first series transition metals, second series transition metals, group II B metals, group III metals, and group IV metals.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the alkaline earth metal is magnesium.
Claim 5
Dependent Claim
26 words
The method of claim 2 wherein the first series transition metal is selected from the group consisting of titanium (IV), chromium, iron (II), cobalt, and nickel.
Claim 6
Dependent Claim
22 words
The method of claim 2 wherein the second series transition metal is selected from the group consisting of yttrium, zirconium and silver.
Claim 7
Dependent Claim
12 words
The method of claim 2 wherein the group III metal is aluminum.
Claim 8
Dependent Claim
23 words
The method of claim 2 wherein the group IV metal is selected from the group consisting of tin (II), tin (IV), and lead.
Claim 9
Dependent Claim
21 words
The method of claim 2 wherein the group II B metal is selected from the group consisting of zinc and cadmium.
Claim 10
Dependent Claim
11 words
The method of claim 1 wherein the metal is tin (II).
Claim 11
Dependent Claim
78 words
The method of claim 1 wherein the depositing step comprises: (a) contacting the asbestos with a solution of an ionizable salt of at least one first metal to deposit at least a portion of the ionizable salt on the asbestos; (b) contacting the asbestos with a solution of a sulfide salt of at least one second metal to form a sulfide of at least one first metal on at least a portion of the surface of the asbestos.
Claim 12
Dependent Claim
13 words
The method of claim 10 wherein the second metal is an alkali metal.
Claim 13
Dependent Claim
19 words
The method of claim 11 wherein the alkali metal is selected from the group consisting of sodium and potassium.
Claim 14
Dependent Claim
38 words
The method of claim 10 wherein the first metal is selected from the group consisting of alkaline earth metals, first series transition metals, second series transition metals, group II B metals, group III metals, and group IV metals.
Claim 15
Dependent Claim
35 words
The method of claim 10 wherein the solution of the ionizable salt has a salt concentration of from about 1 percent by weight to about a concentration corresponding to a saturated solution of the salt.
Claim 16
Dependent Claim
32 words
The method of claim 10 wherein the solution of the ionizable salt has a salt concentration of from about 5 percent by weight to about 10 percent by weight of the salt.
Claim 17
Dependent Claim
27 words
The method of claim 10 wherein the ionizable salt includes at least one member selected from the group consisting of a chloride, a sulfate, and a nitrate.
Claim 18
Dependent Claim
12 words
The method of claim 10 wherein the ionizable salt is a chloride.
Claim 19
Dependent Claim
38 words
The method of claim 10 wherein the solution of the sulfide salt has a concentration of from about 1 percent by weight to about the concentration corresponding to a saturated solution of the sulfide of the second metal.
Claim 20
Dependent Claim
35 words
The method of claim 10 wherein the solution of the sulfide salt has a concentration of from about 1 percent by weight to about 10 percent by weight of the sulfide of the second metal.
Claim 21
Dependent Claim
16 words
The method of claim 10 wherein the solution of the ionizable salt is an aqueous solution.
Claim 22
Dependent Claim
16 words
The method of claim 10 wherein the solution of the sulfide salt is an aqueous solution.
Claim 23
Dependent Claim
29 words
The method of claim 1 wherein the depositing step comprises spraying at least a portion of the asbestos with at least one metal sulfide suspended in a liquid medium.
Claim 24
Dependent Claim
10 words
The method of claim 22 wherein the medium is water.
Claim 25
Dependent Claim
82 words
The method of claim 1 wherein the depositing step comprises: (a) contacting the asbestos with a solution of a sulfide salt of at least one second metal to deposit at least a portion of the sulfide salt on the asbestos; and (b) contacting the asbestos from step (a) with a solution of an ionizable salt of at least one first metal to form a sulfide of at least one first metal on at least a portion of the surface of the asbestos.
Claim 26
Independent Claim
128 words
A method for treating asbestos comprising: (a) slurrying the asbestos with a sufficient amount of an aqueous solution of an ionizable salt of at least one first metal selected from the group consisting of magnesium, titanium (IV), chromium, iron (II), cobalt, nickel, yttrium, zirconium, silver, zinc, cadmium, aluminum, tin (II), tin (IV), and lead to deposit at least a portion of the ionizable salt of at least one first metal on at least a portion of the asbestos; (b) slurrying the asbestos from step (a) with an aqueous solution of a sulfide salt of at least one alkali metal to form a sulfide salt of at least one first metal on at least that portion of the asbestos wherein the ionizable salt of the first metal was deposited.
Claim 27
Independent Claim
128 words
A method for treating asbestos comprising: (a) slurrying the asbestos with a sufficient amount of an aqueous solution of an ionizable salt of at least one first metal selected from the group consisting of magnesium, titanium (IV), chromium, iron (II), cobalt, nickel, yttrium, zirconium, silver, zinc, cadmium, aluminum, tin (II), tin (IV), and lead to deposit at least a portion of the ionizable salt of at least one first metal on at least a portion of the asbestos; (b) slurrying the asbestos from step (a) with an aqueous solution of a sulfide salt of at least one alkali metal to form a sulfide salt of at least one first metal on at least that portion of the asbestos wherein the ionizable salt of the first metal was deposited.
Claim 28
Dependent Claim
39 words
The method of claim 25 including agitating the asbestos and the aqueous solution of the ionizable salt of the first metal for a sufficient time to allow the ionizable salt to contact at least a portion of the asbestos.
Claim 29
Dependent Claim
45 words
A fibrous asbestos material consisting essentially of asbestos fibers and at least one metal sulfide deposited on at least a portion of the asbestos fibers, said material further characterized as having reduced hemolytic activity in comparison to asbestos fibers with no metal sulfide deposited thereon.
Claim 30
Dependent Claim
45 words
A fibrous asbestos material consisting essentially of asbestos fibers and at least one metal sulfide deposited on at least a portion of the asbestos fibers, said material further characterized as having reduced hemolytic activity in comparison to asbestos fibers with no metal sulfide deposited thereon.
Claim 31
Dependent Claim
37 words
The material of claim 27 wherein the metal is selected from the group consisting of alkaline earth metals, first series transition metals, second series transition metals, group II B metals, group III metals, and group IV metals.
Claim 32
Dependent Claim
12 words
The material of claim 28 wherein the alkaline earth metal is magnesium.
Claim 33
Dependent Claim
26 words
The material of claim 28 wherein the first series transition metal is selected from the group consisting of titanium (IV), chromium, iron (II), cobalt, and nickel.
Claim 34
Dependent Claim
22 words
The material of claim 28 wherein the second series transition metal is selected from the group consisting of yttrium, zirconium and silver.
Claim 35
Dependent Claim
12 words
The material of claim 28 wherein the group III metal is aluminum.
Claim 36
Dependent Claim
23 words
The material of claim 28 wherein the group IV metal is selected from the group consisting of tin (II), tin (IV), and lead.
Claim 37
Dependent Claim
21 words
The material of claim 28 wherein the group II B metal is selected from the group consisting of zinc and cadmium.
Claim 38
Dependent Claim
11 words
The material of claim 27 wherein the metal is tin (II).
Claim 39
Dependent Claim
31 words
The material of claim 27 wherein the metal sulfide is present in an amount of from about 0.05 to about 5.0 percent by weight, based on the weight of the asbestos.
References Cited (Backward Citations)
US2626213A
Cited
US3772051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |