Patents by Inventor Alan G. Miller
Alan G. Miller 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: 5589269Abstract: An improved ink-receptive sheet comprising a substrate bearing on at least one major surface thereof an ink-receptive layer which comprises at least one ink receptive polymer and an effective amount of polymeric mordant having the general structure: ##STR1## wherein A is selected from the group consisting of a COO-alkylene group having from 1 to about 5 carbon atoms, a CONH-alkylene group having from 1 to about 5 carbon atoms, --COO--(CH.sub.2 CH.sub.2 O).sub.n --CH.sub.2 --, --CONH--(CH.sub.2 CH.sub.2 O).sub.n --CH.sub.2 -- and .paren open-st.CH.sub.2 CH.sub.2 NH.sub.2 Cl.paren close-st.n, wherein n is from 1 to about 5;E and D are independently selected from the group consisting of alkyl group having from 1 to about 5 carbon atoms;or A, E, D and N are combined to form a heterocyclic compound selected from the group consisting of ##STR2## R.sub.1 and R.sub.Type: GrantFiled: April 25, 1995Date of Patent: December 31, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mahfuza B. Ali, Omar Farooq, Mohammed Iqbal, Alan G. Miller
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Patent number: 5576092Abstract: A layer for preventing sticking of thermal image-forming materials to thermal printheads during thermal printing. The layer comprises polymeric material having a non-cyclic, substantially completely saturated hydrocarbon backbone, said backbone having substantially only hydrogen atoms and methyl groups attached to randomly positioned carbon atoms thereon, with no more than one methyl group attached to any one backbone carbon atom. Application of the anti-stick layer to the substrate is facilitated by the solubility of the polymeric material in commonly used organic solvents, thereby allowing very thin layers of the coating to be applied in the form of dilute solutions.Type: GrantFiled: June 21, 1991Date of Patent: November 19, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Susan K. Jongewaard, Alan G. Miller
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Patent number: 5567507Abstract: An ink-receptive sheet comprising a substrate bearing on at least one major surface an ink-receptive coating comprising at least two layers, a thin upper layer and a thick base layer, wherein said upper layer comprises a high viscosity binder selected from the group consisting of methylcellulose, hydroxypropyl methylcellulose, and blends thereof.Type: GrantFiled: February 28, 1995Date of Patent: October 22, 1996Assignee: Minnesota Mining And Manufacturing CompanyInventors: Armin J. Paff, Alan G. Miller, Donald J. Williams
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Patent number: 5472789Abstract: Semi-interpenetrating polymeric networks comprising a blend of hydrophilic and hydrophobic polymers wherein at least one of the polymeric components is crosslinked after blending to form a continuous network throughout the bulk of the material, and through which the uncrosslinked polymeric components are intertwined in such a way as to form a macroscopically homogeneous composition. The integrity of such networks persists even after absorption of solvent. These materials can be used to form durable, non-tacky, ink-absorbent, transparent coatings for graphical materials.Type: GrantFiled: November 22, 1994Date of Patent: December 5, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mohammad Iqbal, Alan G. Miller, John J. Stofko, Jr.
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Patent number: 5428161Abstract: 3,7-Diamo phenazine dye having at least one electron-withdrawing substituent on at least one of the groups attached to the amine groups at the 3- and 7-positions, provided that the algebraic sum of the para position Hammett sigma (.rho..sub.p) values for the groups attached to the nitrogen atoms of the amine groups at the 3- and 7-positions is more positive khan about -0.6. The group containing the electron-withdrawing substituent can be selected from(1) a substituted alkyl group, and(2) a substituted aryl group.Type: GrantFiled: December 14, 1990Date of Patent: June 27, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Alan G. Miller, Balchunis: Robert J.
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Patent number: 5389723Abstract: Semi-interpenetrating polymeric networks comprising a blend of hydrophilic and hydrophobic polymers wherein at least one of the polymeric components is crosslinked after blending to form a continuous network throughout the bulk of the material, and through which the uncrosslinked polymeric components are intertwined in such a way as to form a macroscopically homogeneous composition. The integrity of such networks persists even after absorption of solvent. These materials can be used to form durable, non-tacky, ink-absorbent, transparent coatings for graphical materials.Type: GrantFiled: October 24, 1990Date of Patent: February 14, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mohammad Iqbal, Alan G. Miller, John J. Stofko, Jr.
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Patent number: 5342688Abstract: An improved ink-receptive sheet comprising a transparent substrate bearing on at least one major surface thereof an ink-receptive layer which comprises at least one imaging polymer and an effective amount of polymeric mordant having the general structure: ##STR1## wherein A is selected from the group consisting of a COO-alkylene group having from about 1 to about 5 carbon atoms, a CONH-alkylene group having from about 1 to about 5 carbon atoms, --COO--(CH.sub.2 CH.sub.2 O)n--CH.sub.2 -- and --CONH-- (CH.sub.2 CH.sub.2 O)n--CH.sub.2 --, wherein n is from about 1 to about 5;B and D are independently selected from the group consisting of alkyl group having from about 1 to about 5 carbon atoms;or A, B, D and N are combined to form a heterocyclic compound selected from the group consisting of ##STR2## R.sub.1 and R.sub.Type: GrantFiled: March 12, 1993Date of Patent: August 30, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Jonathon P. Kitchin, Alan G. Miller, Mahfuza B. Ali, Omar Farooq
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Patent number: 5302436Abstract: A composition suitable for an ink-jet receptive layer comprising from about 1% to about 10% of at least one carboxylic acid having a pKa of from about 2 to about 6, said acid being selected from the group consisting of aryl monocarboxylic acids, aryloxy monocarboxylic acids, alkyl carboxylic acids having alkyl groups containing at least about 11 carbon atoms, dicarboxylic acids, tricarboxylic acids and pyridinium salts, and at least one liquid-absorbent polymer comprising from about 90% to about 99% aprotic constituents, and a transparent sheet suitable for making visual transparencies having a film backing having such ink-receptive layer coated on at least one major surface thereof.Type: GrantFiled: June 4, 1992Date of Patent: April 12, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventor: Alan G. Miller
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Patent number: 5034438Abstract: A layer for preventing sticking of thermal image-forming materials to thermal printheads during thermal printing. The layer comprises polymeric material having a non-cyclic, substantially completely saturated hydrocarbon backbone, said backbone having substantially only hydrogen atoms and methyl groups attached to randomly positioned carbon atoms thereon, with no more than one methyl gorup attached to any one backbone carbon atom. Application of the anti-stick layer to the substrate is facilitated by the solubility of the polymeric material in commonly used organic solvents, thereby allowing very thin layers of the coating to be applied in the form of dilute solutions.Type: GrantFiled: March 21, 1989Date of Patent: July 23, 1991Assignee: Minnesota Mining and Manufacturing CompanyInventors: Susan K. Jongewaard, Alan G. Miller
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Patent number: 4917730Abstract: Thermally imageable composition comprising (a) at least one leuco dye, (b) a nitrate salt, (c) at least one base having a conjugate acid having pKa equal to or greater than zero. The base serves to prevent spotting or backgrounding of transparency films bearing said thermally imageable composition during the manufacturing process used in preparing the films.Type: GrantFiled: October 16, 1985Date of Patent: April 17, 1990Assignee: Minnesota Mining and Manufacturing CompanyInventor: Alan G. Miller
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Patent number: 4889932Abstract: 3,7-Diamino phenazine leuco dyes stabilized in the 10-position with acyl substituents, said acyl substituents being themselves substituted with electron withdrawing groups. The structure of the reduced form of the dye can be represented by the general formula: ##STR1## wherein R.sup.1 represents a member selected from the group consisting of aryl groups having up to 14 carbon atoms and containing from 1 to 5 electrons withdrawing substituents, alkyl groups having up to 4 carbon atoms and containing one or more electron withdrawing groups, certain electron withdrawing groups containing a ##STR2## moiety, and certain electron withdrawing groups containing a --NH-- moiety. These dyes are suitable for use in thermographic imaging systems wherein the leuco dye is in a composition containing a nitrate salt.Type: GrantFiled: February 8, 1988Date of Patent: December 26, 1989Assignee: Minnesota Mining and Manufacturing CompanyInventor: Alan G. Miller
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Patent number: 4647525Abstract: 3,7-Diamino phenazine leuco dyes stabilized in the 10-position with acyl substituents, said acyl substituents being themselves substituted with electron withdrawing groups. These dyes are suitable for use in thermographic imaging systems wherein the leuco dye is in a composition containing a nitrate salt.Type: GrantFiled: October 1, 1984Date of Patent: March 3, 1987Assignee: Minnesota Mining and Manufacturing CompanyInventor: Alan G. Miller
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Patent number: 4563415Abstract: Thermographic composition comprising a leuco dye, a nitrate salt, and, optionally, an acid and stabilizing compound. The leuco dye contains a phenazine nucleus with naphthoyl substitutents on the 10-position and, optionally on one or both of the 3- and 7-positions through an amino group.In their oxidized form, the leuco dyes of this invention provide access to a range of red and magenta colors which exhibit greater stability when subjected to light and temperatures characteristic of the stage of overhead projectors than that exhibited by previously available leuco dyes of this color range.Type: GrantFiled: October 18, 1984Date of Patent: January 7, 1986Assignee: Minnesota Mining and Manufacturing CompanyInventors: Harvey A. Brown, Louis M. Leichter, Alan G. Miller