Patents by Inventor David R. Boston
David R. Boston 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: 6001522Abstract: The present invention provides a photoconductor element for use in electrophotographic imaging, including a support, a photoconductive layer coated on the support, and a barrier layer coated on the photoconductive layer. The barrier layer includes an organic polymer and silica.Type: GrantFiled: July 15, 1993Date of Patent: December 14, 1999Assignee: Imation Corp.Inventors: Edward J. Woo, David R. Boston
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Patent number: 5997621Abstract: A coating composition which imparts anti-reflective and anti-fog properties to substrates coated therewith. The coating composition utilizes an inorganic metal oxide in combination with particular anionic surfactants. The coating compositions are particularly useful in the manufacture of disposable surgical masks and face shields.Type: GrantFiled: October 7, 1998Date of Patent: December 7, 1999Assignee: Minnesota Mining and Manufacturing Co.Inventors: Matthew T. Scholz, William L. Kausch, David R. Boston, Joseph M. Zoborowski
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Patent number: 5873931Abstract: A coating composition which imparts anti-reflective and anti-fog properties to substrates coated therewith. The coating composition utilizes an inorganic metal oxide in combination with particular anionic surfactants. The coating compositions are particularly useful in the manufacture of disposable surgical masks and face shields.Type: GrantFiled: October 29, 1996Date of Patent: February 23, 1999Assignee: Minnesota Mining and Manufacturing CompanyInventors: Matthew T. Scholz, William L. Kausch, David R. Boston, Joseph M. Zoborowski
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Patent number: 5637368Abstract: An antistatic adhesive article which comprises an adhesive layer and utilizes vanadium oxide to impart antistatic properties to the article. The article is preferably an adhesive tape or sheet. The adhesive may be pressure sensitive or non-pressure sensitive. The vanadium oxide may be incorporated into or onto the tape from an aqueous dispersion.Type: GrantFiled: April 20, 1993Date of Patent: June 10, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: David A. Cadalbert, Eric D. Morrison, Tamara L. Johnson, William L. Kausch, David R. Boston, Wayne K. Larson, Steven T. Hedrick
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Patent number: 5494774Abstract: A thermal transfer system for transferring material in an imagewise manner by means of thermal transfer printing from a donor element to an image receiving element is used to prepare printing plates. In one construction, a donor element, which is prepared by coating a photoinitiator (and optionally a sensitizer) in a binder on a backing material, is used with an image receiving element, which is prepared by coating a photopolymer (and optionally a sensitizer) on a substrate having a microporous hydrophilic crosslinked silicated surface. In an alternative construction, a donor element, which is prepared by coating a sensitizer in a binder on a backing material, is used with an image receiving element, which is prepared by coating a photopolymer and photoinitiator on a substrate having a microporous hydrophilic crosslinked silicated surface.Type: GrantFiled: April 10, 1995Date of Patent: February 27, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: M. Zaki Ali, Mahfuza B. Ali, David R. Boston, Jeffrey C. Chang
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Patent number: 5468498Abstract: Aqueous-based mixtures comprising colloidal vanadium oxide and a dispersed sulfonated polymer impart antistatic properties to coatings on a substrate and to self-supporting articles. The preferred colloidal vanadium oxide is alkoxide derived and provides mixed valence vanadium oxide wherein the vanadium ions are typically +4 and +5. Preferred sulfopolymers include sulfopolyesters, sulfopolyurethanes, sulfopolyurethanes/ureas, sulfopolyester polyols, and sulfopolyols. Antistatic composite structures comprising colloidal vanadium oxide and a sulfopolymer are also disclosed.Type: GrantFiled: March 20, 1995Date of Patent: November 21, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Eric D. Morrison, David R. Boston, Steven T. Hedrick, William L. Kausch, Wayne K. Larson, Simon S. Fung
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Patent number: 5460918Abstract: A thermal transfer system for transferring material in an imagewise manner by means of thermal transfer printing from a donor element to an image receiving element is used to prepare printing plates. In one construction, a donor element, which is prepared by coating a photoinitiator (and optionally a sensitizer) in a binder on a backing material, is used with an image receiving element, which is prepared by coating a photopolymer (and optionally a sensitizer) on a substrate having a microporous hydrophilic crosslinked silicated surface. In an alternative construction, a donor element, which is prepared by coating a sensitizer in a binder on a backing material, is used with an image receiving element, which is prepared by coating a photopolymer and photoinitiator on a substrate having a microporous hydrophilic crosslinked silicated surface.Type: GrantFiled: October 11, 1994Date of Patent: October 24, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: M. Zaki Ali, Mahfuza Ali, David R. Boston, Jeffrey C. Chang
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Patent number: 5457015Abstract: A reduction of static buildup on surfaces can be accomplished by providing a coating which is the dried and reacted product of an aqueous composition of chitosan salt and inorganic metal oxide sol. A stable, static reducing coating on polymeric substrates is particularly useful in photographic media.Type: GrantFiled: May 17, 1994Date of Patent: October 10, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventor: David R. Boston
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Patent number: 5449525Abstract: A method for producing a magnetic recording medium while minimizing electrostatic charge buildup on the medium during production. The method comprises applying a liquid material over a surface of a moving web to form a continuous wet coating thereon and smoothing the wet coating with a flexible blade having two major surfaces. The flexible smoothing blade comprises a conductive layer and is positioned so that a portion of one major surface is in contact with the wet coating so that electrostatic charge on the coated web is continuously dissipated.Type: GrantFiled: January 19, 1995Date of Patent: September 12, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: David J. Lundberg, David R. Boston, Delbert L. Olson, William L. Kausch
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Patent number: 5439785Abstract: Light-sensitive photographic element comprising a polymeric film base, a silver halide emulsion layer, and an antistatic layer comprising a colloidal vanadium oxide and a sulfopolyester. The antistatic layer may be present as a backing layer on the side of the base opposite the silver halide emulsion layer, as a subbing layer between the base and the emulsion layer in a single or double side coated photographic element, and/or as a subbing layer between the base and a different backing layer.Type: GrantFiled: July 19, 1994Date of Patent: August 8, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: David R. Boston, William L. Kausch, Elio Martino, Eric D. Morrison, Alberto Valsecchi
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Patent number: 5427835Abstract: Aqueous-based mixtures comprising colloidal vanadium oxide and a dispersed sulfonated polymer impart antistatic properties to coatings on a substrate and to self-supporting articles. The preferred colloidal vanadium oxide is alkoxide derived and provides mixed valence vanadium oxide wherein the vanadium ions are typically +4 and +5. Preferred sulfopolymers include sulfopolyesters, sulfopolyurethanes, sulfopolyurethanes/ureas, sulfopolyester polyols, and sulfopolyols. Antistatic composite structures comprising colloidal vanadium oxide and a sulfopolymer are also disclosed.Type: GrantFiled: June 4, 1992Date of Patent: June 27, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Eric D. Morrison, David R. Boston, Steven T. Hedrick, William L. Kausch, Wayne K. Larson, Simon S. Fung
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Patent number: 5348799Abstract: A reduction of static buildup on surfaces can be accomplished by providing a coating which is the dried and reacted product of an aqueous composition of chitosan salt and inorganic metal oxide sol. A stable, static reducing coating on polymeric substrates is particularly useful in photographic media.Type: GrantFiled: September 3, 1991Date of Patent: September 20, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventor: David R. Boston
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Patent number: 5203884Abstract: An abrasive article (i.e., a coated abrasive article or a three-dimensional, low density abrasive article) having a sufficient amount of vanadium oxide incorporated therein to provide having a reduced tendency to buildup static electricity during the abrading of a workpiece. Preferably, the abrasive article further comprises a compatible binder (preferably, a sulfonated polymer) to aid in securing the vanadium oxide to the abrasive article. In another aspect, a method of making the same is taught.Type: GrantFiled: June 4, 1992Date of Patent: April 20, 1993Assignee: Minnesota Mining and Manufacturing CompanyInventors: Scott J. Buchanan, Eric D. Morrison, David R. Boston, Steven T. Hedrick, William L. Kausch, Wayne K. Larson
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Patent number: 5204219Abstract: The use of a gelled network of inorganic oxide particles on the polymeric surface of a substrate provides a subbing layer having the potential for antistatic properties, antihalation properties, and good coatability.Type: GrantFiled: January 21, 1992Date of Patent: April 20, 1993Assignee: Minnesota Mining and Manufacturing CompanyInventors: Wim J. Van Ooij, David R. Boston, Edward J. Woo
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Patent number: 5124308Abstract: This invention concerns monosubstituted dithiooxamides, and a preferred class comprises those wherein the substituent is such that the resulting dithiooxamide derivative is substantially nonvolatile at about room temperature. Preferred materials are those for which when the monosubstituent dithiooxamide is complexed with a transition metal cation, the resulting polymer is substantially a dark, i.e., preferably blue or blue-black color. Carbonless paper constructions involving use of N-(monosubstituted)dithiooxamides to advantage are described.Type: GrantFiled: November 17, 1989Date of Patent: June 23, 1992Inventors: Loren D. Albin, David R. Boston, Derek R. Callaby, Jacqueline M. Furlong, Robert J. Lokken, Roger A. Mader, David B. Olson, Wayne O. Otteson, Norman P. Sweeny, Daryle H. Busch, Nusrallah Jubran
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Patent number: 4746597Abstract: An image deletion fluid for printing plates which use a silver image as an ink-receptive area. The deletion fluid comprises iodine and an effective excess of iodide ion, which form a triiodide complex, and a hydrophilic-matrix-forming agent. In a preferred embodiment, the deletion fluid further comprises an organic, preferably polar, solvent. The deletion fluid is applied to the surface of the plate, rubbed briefly and allowed to dry there, with no removal or rinsing away of the deletion fluid or by-products required.Type: GrantFiled: October 22, 1986Date of Patent: May 24, 1988Assignee: Minnesota Mining and Manufacturing Co.Inventors: Bruce A. Zellmer, David R. Boston
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Patent number: 4603100Abstract: Composition and process for enhancing silver images. A composition comprising an oxidizing agent for metallic silver and a silver ion insolubilizing agent is reacted with photographically produced silver deposits. The composition and process is particularly useful in enhancing the lithographic utility of photographically produced silver deposits which function as the inkable image area of lithographic printing plates.Type: GrantFiled: March 14, 1985Date of Patent: July 29, 1986Assignee: Minnesota Mining and Manufacturing CompanyInventor: David R. Boston
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Patent number: 4330605Abstract: A photolithographic receptor sheet for silver diffusion transfer imaging comprising a support with a hydrophilic layer thereon consisting essentially of colloidal silica and a defined dry hydrophilic powder, and a catalytic silver precipitating nuclei layer thereover. The imaged construction is useful as a lithographic printing plate.Type: GrantFiled: January 21, 1981Date of Patent: May 18, 1982Assignee: Minnesota Mining and Manufacturing CompanyInventor: David R. Boston
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Patent number: 4223087Abstract: A photolithographic plate, method for preparation thereof, and salt compound useful in the preparation, the method involving the treatment of a metallic silver image on a substrate with a homogeneously stable acidic aqueous salt solution comprising a ferricyanide anion for oxidizing the metallic silver and an organic cation capable of forming a water-insoluble, inherently oleophilic complex with oxidized silver, the cation being derived from a protonatable nitrogen-substituted hydrocarbon compound containing a formal imine group therein which is in resonant association with adjacent groups within the hydrocarbon compound.Type: GrantFiled: June 9, 1976Date of Patent: September 16, 1980Assignee: Minnesota Mining and Manufacturing CompanyInventor: David R. Boston
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Patent number: 4204868Abstract: A photolithographic plate, method for preparation thereof, and salt compound useful in the preparation, the method involving the treatment of a metallic silver image on a substrate with a homogeneously stable acidic aqueous salt solution comprising a ferricyanide anion for oxidizing the metallic silver and an organic cation capable of forming a water-insoluble, inherently oleophilic complex with oxidized silver, the cation being derived from a protonatable nitrogen-substituted hydrocarbon compound containing a formal imine group therein which is in resonant association with adjacent groups within the hydrocarbon compound.Type: GrantFiled: November 7, 1977Date of Patent: May 27, 1980Assignee: Minnesota Mining and Manufacturing CompanyInventor: David R. Boston