Patents by Inventor Robert D. Hansen
Robert D. Hansen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5057209Abstract: A flotation process is disclosed wherein the selectivity to the valuable mineral is improved by the depression of silica or siliceous gangue by the use of a hydroxy-containing compound such as an alkanol amine. The process is useful in the flotation of oxide minerals as well as in sulfide flotation.Type: GrantFiled: February 23, 1990Date of Patent: October 15, 1991Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Donald E. Leonard, Robert D. Hansen, Basil S. Fee
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Patent number: 4830740Abstract: The separation of coal from pyrite is enhanced by the use of an effective amount of a polymeric acid or salt thereof as a pyrite depressant in conventional flotation processes. The polymeric acid may be a carboxylic or sulfonic acid. An example of a salt of a polymeric acid useful in the process is sodium polyacrylate.Type: GrantFiled: April 19, 1988Date of Patent: May 16, 1989Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen
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Patent number: 4826588Abstract: The separation of coal from pyrite during a froth flotation process is enhanced by the use of an effective amount of a pyrite depressant. The depressant is a hydrophilic nitrogen-sulfur-containing compound.Type: GrantFiled: April 28, 1988Date of Patent: May 2, 1989Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen, Michael J. Fazio
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Patent number: 4822483Abstract: A collector composition for use in froth flotation processes comprises two collectors. One of the collectors is preferably an N-(hydrocarbyl)-alpha, omega-alkanediamine, an (omega-aminoalkyl) hydrocarbon amide or mixture thereof. The second collector is a thiocarbonate, a thionocarbamate, a thiophosphate, thiocarbinilide, thiophosphinate, mercaptan, xanthogen formate, xanthic ester or mixture thereof. The collector composition floats a broad range of metal-containing minerals.Type: GrantFiled: March 23, 1987Date of Patent: April 18, 1989Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen
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Patent number: 4820406Abstract: The froth flotation of coal is conducted in the presence of an epoxide conditioner.Type: GrantFiled: May 6, 1987Date of Patent: April 11, 1989Assignee: The Dow Chemical CompanyInventors: Robert D. Hansen, Richard R. Klimpel
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Patent number: 4808301Abstract: The flotation of desired mineral ores is selectively depressed by the use of an effective amount of a polycarboxylic acid or salt thereof in a reverse flotation process. As an example, the flotation of iron-containing minerals, such as iron oxides or iron powder, is selectively depressed when compared to the flotation of silicate gangue thus facilitating the recovery of the desired mineral by the use of an effective amount of a polycarboxylic acid or salt thereof such as sodium polyacrylate.Type: GrantFiled: November 4, 1987Date of Patent: February 28, 1989Assignee: The Dow Chemical CompanyInventors: Robert D. Hansen, Richard R. Klimpel
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Patent number: 4797202Abstract: Minerals are recovered from ore by subjecting the ore, in the form of an aqueous pulp, to a froth flotation process in the presence of a collector of the formula:R.sup.1 --X--(R).sub.n --N--(R.sup.2).sub.2 (Ia)orR.sup.1 --X--(R).sub.n --N=Y (Ib)wherein --(R).sub.n -- is ##STR1## each R' is independently hydrogen, methyl or ethyl; y+p+m=n; n is an integer from 1 to 6; y and m are independently 0 or 1 and y+m=0 or 1 and p is an integer from 1 to 6 and each moiety can occur in random sequence; R.sup.1 is a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl and each R.sup.2 is independently hydrogen, a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl; --X-- is --N(R.sup.3)-- or ##STR2## R.sup.3 is H or a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl; =Y is =S, =O, a hydrocarbylene or a substituted hydrocarbylene radical.Type: GrantFiled: February 26, 1987Date of Patent: January 10, 1989Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen
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Patent number: 4789392Abstract: Minerals are recovered from ore by subjecting the ore, in the form of an aqueous pulp, to a froth flotation process in the presence of a collector of the formula:R.sup.1 --X--(R).sub.n --N--(R.sup.2).sub.2 or (Ia)R.sup.1 --X--(R).sub.n --N.dbd.Y (Ib)wherein (--R--).sub.n is ##STR1## each R' and R" is independently hydrogen, methyl or ethyl; y+p+m=n; n is an integer from 1 to 6; y and m are independently 0 or 1 and y+m=0 or 1 and p is an integer from 1 to 6 and each moiety can occur in random sequence; R.sup.1 is a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl; each R.sup.2 is independently hydrogen, a C.sub.1-22 hydrocarbyl or a C.sub.1-22 substituted hydrocarbyl; --X-- is --S-- or ##STR2## and .dbd.Y is .dbd.S, .dbd.O, a hydrocarbylene or a substituted hydrocarbylene radical.Type: GrantFiled: February 26, 1987Date of Patent: December 6, 1988Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen
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Patent number: 4770767Abstract: The froth flotation of coal is conducted in the presence of a conditioner of an oxygen containing compound of the formula:R.sub.1 --O--R.sub.2).sub.n (I)wherein R.sub.1 and each R.sub.2 are independently saturated hydrocarbyls and n is from 1 to about 3.Type: GrantFiled: May 6, 1987Date of Patent: September 13, 1988Assignee: The Dow Chemical CompanyInventors: Robert D. Hansen, Richard R. Klimpel
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Patent number: 4761223Abstract: The invention is a process for recovering coal from raw coal which comprises subjecting the raw coal in the form of an aqueous pulp, to a flotation process in the presence of a flotation collector, and a flotating amount of a flotation frother which comprises the reaction product of a polyhydroxy C.sub.1-20 alkane or polyhydroxy C.sub.3-20 cycloalkane and propylene oxide, or a mixture of propylene oxide and ethylene oxide, with the proviso that at least 50 mole percent of the mixture is propylene oxide, and the reaction product has a molecular weight of between about 150 and 1400, under conditions such that the coal is recovered.Type: GrantFiled: August 29, 1984Date of Patent: August 2, 1988Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen
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Patent number: 4735711Abstract: This invention relates to a froth flotation process for selectively recovering metal-containing sulfide or sulfidized metal-containing oxide minerals from ores using a froth flotation process. The collector employed in the process is an organic monosulfide of the formula:R.sub.1 --S--R.sub.2wherein R.sub.1 is a methyl, ethyl, epoxy (i.e., ##STR1## group or R.sub.3 --S--R.sub.4 wherein R.sub.3 is a hydrocarbyl or substituted hydrocarbyl group and R.sub.4 is a hydrocarbylene or substituted hydrocarbylene; and R.sub.2 is an alkyl or cycloalkyl group having from 5 to 11 carbon atoms.Type: GrantFiled: May 6, 1986Date of Patent: April 5, 1988Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen, Edwin J. Strojny
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Patent number: 4732668Abstract: This invention relates to a froth flotation process for selectively recovering nonferrous metal-containing sulfide minerals or sulfidized metal-containing oxide minerals from ores using froth flotation. The collector employed in the process is an epithio compound of the formula: ##STR1## wherein m=1, 2 or 3; each R is independently hydrogen, a hydrocarbyl group or substituted hydrocarbyl group; each R.sup.1 is independently hydrogen, a hydrocarbyl group or substituted hydrocarbyl group, provided one R or R.sup.1 is not hydrogen; and each R.sup.2 is independently hydrogen, hydrocarbyl, hydrocarbyloxy or hydrocarbyl thioether.Type: GrantFiled: May 6, 1986Date of Patent: March 22, 1988Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen, Edwin J. Strojny
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Patent number: 4702822Abstract: This invention relates to a novel composition which is useful as a collector for the recovery of nonferrous metal-containing sulfide minerals and sulfidized metal-containing oxide minerals from ores in a froth flotation process. The novel composition comprises (a) an organic compound containing one or more monosulfide units wherein the sulfur atom(s) are bound to aliphatic or cycloaliphatic carbon atoms, and the total carbon content of the compound is such that the compound has sufficient hydrophobic character to cause metal-containing sulfide mineral or sulfidized metal-containing oxide mineral particles to be driven to an air/bubble interface; and (b) an alkyl thiocarbonate, a thionacarbamate, a thiophosphate, or mixtures thereof.Type: GrantFiled: June 18, 1986Date of Patent: October 27, 1987Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen
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Patent number: 4684459Abstract: A collector composition for use in froth flotation processes comprises two collectors. One of the collectors is preferably an omega-(hydrocarbylthio)alkylamine, S-(omega-aminoalkyl) hydrocarbyl thioate, N-(hydrocarbyl)-alpha, omega-alkanediamine, (omega-aminoalkyl) hydrocarbon amide, omega-(hydrocarbyloxy)alkylamine, omega-aminoalkyl hydrocarbonoate or mixture thereof. The second collector is a thiocarbonate, a thionocarbamate, a thiophosphate, thiocarbinilide, thiophosphinate, mercaptan, xanthogen formate, xanthic ester or mixture thereof. The collector composition floats a broad range of metal-containing minerals.Type: GrantFiled: April 28, 1986Date of Patent: August 4, 1987Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen
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Patent number: 4676890Abstract: A collector composition useful for the recovery of metal values from metal ores in a froth flotation process comprises two collectors. One collector is an organic compound containing at least 4 carbon atoms and one or more monosulfide units, wherein the carbon atoms to which the sulfur atoms are bound are aliphatic or cycloaliphatic carbons. The other collector is preferably an omega-(hydrocarbylthio)alkylamine, S-(omega-aminoalkyl)hydrocarbyl thioate, N-(hydrocarbyl)-alpha, omega-alkanediamine, N-(omega-aminoalkyl)hydrocarbon amide, omega-(hydrocarbyloxy)alkalamine, omega-aminoalkyl hydrocarbonate or mixture thereof. The collector composition floats a broad range of metal values including sulfide ores, oxide ores and precious metals.Type: GrantFiled: April 28, 1986Date of Patent: June 30, 1987Assignee: The Dow Chemical CompanyInventors: Richard R. Klimpel, Robert D. Hansen
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Patent number: 4582596Abstract: The invention is a process for recovering coal or mineral values from raw coal or mineral ore which comprises subjecting the raw coal or mineral ore in the form of an aqueous pulp, to a floatation process in the presence of a floatation collector, and a flotating amount of a floatation frother which comprises the reaction product of an alitphatic C.sub.6 alcohol and between about 1 and 5 moles of propylene oxide, butylene oxide or mixtures thereof, under conditions such that the coal or mineral values are recovered.Type: GrantFiled: June 4, 1984Date of Patent: April 15, 1986Assignee: The Dow Chemical CompanyInventors: Robert D. Hansen, Roger W. Bergman, Richard R. Klimpel
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Patent number: RE32778Abstract: The invention is a process for recovering coal or mineral values from raw coal or mineral ore which comprises subjecting the raw coal or mineral ore in the form of an aqueous pulp, to a floatation process in the presence of a floatation collector, and a flotating amount of a floatation frother which comprises the reaction product of an alitphatic C.sub.6 alcohol and between about 1 and 5 moles of propylene oxide, butylene oxide or mixtures thereof, under conditions such that the coal or mineral values are recovered.Type: GrantFiled: October 27, 1986Date of Patent: November 8, 1988Assignee: The Dow Chemical CompanyInventors: Robert D. Hansen, Richard R. Klimpel, Roger W. Bergman
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Patent number: D670511Type: GrantFiled: January 5, 2012Date of Patent: November 13, 2012Assignee: Endgrain, LLCInventor: Robert D. Hansen, Jr.
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Patent number: D682584Type: GrantFiled: September 24, 2012Date of Patent: May 21, 2013Assignee: Endgrain, LLCInventor: Robert D. Hansen, Jr.
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Patent number: D684412Type: GrantFiled: September 24, 2012Date of Patent: June 18, 2013Assignee: Endgrain, LLCInventor: Robert D. Hansen, Jr.