Patents by Inventor Timothy D. Dunbar
Timothy D. Dunbar 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: 11844849Abstract: Dental compositions and methods of formulating a dental composition are described. In one embodiment, the dental composition comprises a polymerizable resin comprising one or more ethylenically unsaturated monomers or oligomers and nanoparticles. The nanoparticles have a refractive index of at least 1.600 and an average discrete or aggregate particle size of no greater than 100 nm. The dental composition further comprises inorganic metal oxide filler having a discrete or aggregate average particle size of at least 200 nm. The nanoparticles are present at a concentration to provide a refractive index differential between the cured polymerizable resin and inorganic metal oxide filler such that the contrast ratio of the dental composition is at least 40.Type: GrantFiled: January 7, 2022Date of Patent: December 19, 2023Assignee: 3M INNOVATIVE PROPERTIES COMPANYInventors: Bradley D. Craig, Timothy D. Dunbar, Karsten Dede, Adrian S. Eckert, Ahmed S. Abuelyaman, Gregory A. Kobussen, Christoph H. Thalacker, Paul J. Homnick
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Patent number: 11553996Abstract: A radiation curable composition including at least one radiation hardenable component, a photo-initiator, and a filler material having a population of particulates in an amount greater than or equal to 50% by weight of the printable composition. The population of particulates exhibits a median diameter (D50) of greater than or equal to 0.3 micrometer on a volume-average basis as determined using the Particle Size Test Method, and the radiation curable composition exhibits a viscosity of less than or equal to 150 Pa s when measured using the Viscosity Test Method. A method, apparatus, and systems for producing composite articles by selectively exposing a portion of the radiation curable composition to a source of actinic radiation to at least partially cure the exposed portion of the radiation curable composition, thereby forming a hardened layer, preferably by an additive manufacturing process such as stereophotolithography, are also described. The composite articles may include composite dental restorations.Type: GrantFiled: August 22, 2018Date of Patent: January 17, 2023Assignee: 3M Innovative Properties CompanyInventors: Zeba Parkar, James D. Hansen, Tianyu Wu, Carsten Franke, Timothy D. Dunbar, Gregory A. Kobussen, Ahmed S. Abuelyaman, Bradley D. Craig
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Patent number: 11377573Abstract: A curable composition that includes a urethane multifunctional (meth)acrylate, an inorganic filler having a primary particle dimension of at least 200 nm, a photoinitiator system that can be activated by electromagnetic radiation in the range of 340-550 nm, a reactive diluent, and a reinforcing silica having a primary particle dimension of 100 nm of less. The sum of the absolute value of the difference in the refractive index of the filler and the refractive index of the composition cured without filler plus the birefringence of the filler is 0.054 or less, i.e. 0.054?|nfiller?nmatrix|+?filler, where nfiller is the refractive index of the filler, nmatrix is the refractive index of the composition cured without filler, and ?filler is the birefringence of the filler.Type: GrantFiled: September 5, 2019Date of Patent: July 5, 2022Assignee: 3M Innovative Properties CompanyInventors: Ying Lin, Sheng Ye, Timothy D. Dunbar, Bradley D. Craig, Dong-Wei Zhu, Matthew J. Kryger, Richard J. Pokorny, Michael A. Kropp
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Publication number: 20220125687Abstract: Dental compositions and methods of formulating a dental composition are described. In one embodiment, the dental composition comprises a polymerizable resin comprising one or more ethylenically unsaturated monomers or oligomers and nanoparticles. The nanoparticles have a refractive index of at least 1.600 and an average discrete or aggregate particle size of no greater than 100 nm. The dental composition further comprises inorganic metal oxide filler having a discrete or aggregate average particle size of at least 200 nm. The nanoparticles are present at a concentration to provide a refractive index differential between the cured polymerizable resin and inorganic metal oxide filler such that the contrast ratio of the dental composition is at least 40.Type: ApplicationFiled: January 7, 2022Publication date: April 28, 2022Inventors: Bradley D. Craig, Timothy D. Dunbar, Karsten Dede, Adrian S. Eckert, Ahmed S. Abuelyaman, Gregory A. Kobussen, Christoph H. Thalacker, Paul J. Homnick
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Patent number: 11246808Abstract: Dental compositions and methods of formulating a dental composition are described. In one embodiment, the dental composition comprises a polymerizable resin comprising one or more ethylenically unsaturated monomers or oligomers and nano-particles. The nanoparticles have a refractive index of at least 1.600 and an average discrete or aggregate particle size of no greater than 100 nm. The dental composition further comprises inorganic metal oxide filler having a discrete or aggregate average particle size of at least 200 nm. The nanoparticles are present at a concentration to provide a refractive index differential between the cured polymerizable resin and inorganic metal oxide filler such that the contrast ratio of the dental composition is at least 40.Type: GrantFiled: February 1, 2017Date of Patent: February 15, 2022Assignee: 3M INNOVATIVE PROPERTIES COMPANYInventors: Bradley D. Craig, Timothy D. Dunbar, Karsten Dede, Adrian S. Eckert, Ahmed S. Abuelyaman, Gregory A. Kobussen, Christoph H. Thalacker, Paul J. Homnick
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Publication number: 20210198520Abstract: A curable composition that includes a urethane multifunctional (meth)acrylate, an inorganic filler having a primary particle dimension of at least 200 nm, a photoinitiator system that can be activated by electromagnetic radiation in the range of 340-550 nm, a reactive diluent, and a reinforcing silica having a primary particle dimension of 100 nm of less. The sum of the absolute value of the difference in the refractive index of the filler and the refractive index of the composition cured without filler plus the birefringence of the filler is 0.054 or less, i.e. 0.054?|nfiller?nmatrix|+?filler, where nfiller is the refractive index of the filler, nmatrix is the refractive index of the composition cured without filler, and ?filler is the birefringence of the filler.Type: ApplicationFiled: September 5, 2019Publication date: July 1, 2021Inventors: Ying Lin, Sheng Ye, Timothy D. Dunbar, Bradley D. Craig, Dong-Wei Zhu, Matthew J. Kryger, Richard J. Pokorny, Michael A. Kropp
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Publication number: 20200197138Abstract: A radiation curable composition including at least one radiation hardenable component, a photo-initiator, and a filler material having a population of particulates in an amount greater than or equal to 50% by weight of the printable composition. The population of particulates exhibits a median diameter (D50) of greater than or equal to 0.3 micrometer on a volume-average basis as determined using the Particle Size Test Method, and the radiation curable composition exhibits a viscosity of less than or equal to 150 Pa s when measured using the Viscosity Test Method. A method, apparatus, and systems for producing composite articles by selectively exposing a portion of the radiation curable composition to a source of actinic radiation to at least partially cure the exposed portion of the radiation curable composition, thereby forming a hardened layer, preferably by an additive manufacturing process such as stereophotolithography, are also described. The composite articles may include composite dental restorations.Type: ApplicationFiled: August 22, 2018Publication date: June 25, 2020Inventors: Zeba Parkar, James D. Hansen, Tianyu Wu, Carsten Franke, Timothy D. Dunbar, Gregory A. Kobussen, Ahmed S. Abuelyaman, Bradley D. Craig
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Publication number: 20190038516Abstract: Dental compositions and methods of formulating a dental composition are described. In one embodiment, the dental composition comprises a polymerizable resin comprising one or more ethylenically unsaturated monomers or oligomers and nano-particles. The nanoparticles have a refractive index of at least 1.600 and an average discrete or aggregate particle size of no greater than 100 nm. The dental composition further comprises inorganic metal oxide filler having a discrete or aggregate average particle size of at least 200 nm. The nanoparticles are present at a concentration to provide a refractive index differential between the cured polymerizable resin and inorganic metal oxide filler such that the contrast ratio of the dental composition is at least 40.Type: ApplicationFiled: February 1, 2017Publication date: February 7, 2019Inventors: Bradley D. Craig, Timothy D. Dunbar, Karsten Dede, Adrian S. Eckert, Ahmed S. Abuelyaman, Gregory A. Kobussen, Christoph H. Thalacker, Paul J. Homnick
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Patent number: 10028894Abstract: The invention relates to a curable composition for dental use comprising polyoxymetalates and/or derivatives thereof in an amount of at least about 5 wt.-% with respect to the weight of the composition.Type: GrantFiled: September 4, 2014Date of Patent: July 24, 2018Assignee: 3M Innovative Properties CompanyInventors: Adam D. Miller, Matthew H. Frey, Timothy D. Dunbar, Henry Loll, Christoph Thalacker
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Publication number: 20160199267Abstract: The invention relates to a curable composition for dental use comprising polyoxymetalates and/or derivatives thereof in an amount of at least about 5 wt.-% with respect to the weight of the composition.Type: ApplicationFiled: September 4, 2014Publication date: July 14, 2016Inventors: Adam D. Miller, Matthew H. Frey, Timothy D. Dunbar, Henry Loll, Christoph Thalacker
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Patent number: 9320685Abstract: Dental compositions are described comprising an addition-fragmentation agent of the formula: wherein R1, R2 and R3 are each independently Zm-Q-, a (hetero)alkyl group or a (hetero)aryl group with the proviso that at least one of R1, R2 and R3 is Zm-Q-; Q is a linking group have a valence of m+1; Z is an ethylenically unsaturated polymerizable group; m is 1 to 6; each X1 is independently —O— or —NR4—, where R4 is H or C1-C4 alkyl; and n is 0 or 1. Also described are dental articles prepared from a dental composition comprising an addition-fragmentation agent and methods of treating a tooth surface.Type: GrantFiled: May 8, 2015Date of Patent: April 26, 2016Assignee: 3M Innovative Properties CompanyInventors: William H. Moser, Guy D. Joly, Larry R. Krepski, Babu N. Gaddam, Ahmed S. Abuelyaman, Bradley D. Craig, Timothy D. Dunbar, Chuntao Cao, Joel D. Oxman, Afshin Falsafi, Hoa T. Bui
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Publication number: 20150238389Abstract: Dental compositions are described comprising an addition-fragmentation agent of the formula: wherein R1, R2 and R3 are each independently Zm-Q-, a (hetero)alkyl group or a (hetero)aryl group with the proviso that at least one of R1, R2 and R3 is Zm-Q-; Q is a linking group have a valence of m+1; Z is an ethylenically unsaturated polymerizable group; m is 1 to 6; each X1 is independently —O— or —NR4—, where R4 is H or C1-C4 alkyl; and n is 0 or 1. Also described are dental articles prepared from a dental composition comprising an addition-fragmentation agent and methods of treating a tooth surface.Type: ApplicationFiled: May 8, 2015Publication date: August 27, 2015Inventors: William H. Moser, Guy D. Joly, Larry R. Krepski, Babu N. Gaddam, Ahmed S. Abuelyaman, Bradley D. Craig, Timothy D. Dunbar, Chuntao Cao, Joel D. Oxman, Afshin Falsafi, Hoa T. Bui
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Patent number: 9072664Abstract: Powder drug compositions exhibiting improved flow properties are manufactured by spraying a suspension of surface-modified nanoparticles having an average particle size diameter of less than 100 nm in a dryable liquid carrier onto particles of a powder ingredient of a drug composition. The liquid carrier is rapidly dried so as to leave the nanoparticles on the powder. Other ingredients of the powder drug composition can also be added.Type: GrantFiled: April 17, 2009Date of Patent: July 7, 2015Assignee: 3M INNOVATIVE PROPERTIES COMPANYInventors: Stephen W. Stein, Michael W. Mueting, Timothy D. Dunbar
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Patent number: 9056043Abstract: Dental compositions are described comprising an addition-fragmentation agent comprising at least one ethylenically unsaturated terminal group and a backbone unit comprising an ?,?-unsaturated carbonyl; at least one monomer comprising at least two ethylenically unsaturated group; and inorganic oxide filler. The addition-fragmentation agent is preferably free-radically cleavable. The addition-fragmentation agent preferably comprises at least two ethylenically unsaturated terminal groups, such as (meth)acTylate groups. In some embodiments, the addition-fragmentation agent has the formula: wherein R1, R2 and R3 are each independently Zm, -Q-, a (hetero)alkyl group or a (hetero)aryl group with the proviso that at least one of R1, R2 and R3 is Zm-Q-; Q is a linking group have a valence of m+1; Z is an ethylenically unsaturated polymerizable group; m is 1 to 6; each X1 is independently —O— or —NR4—, where R4 is H or C1-C4 alkyl; and n is 0 or 1.Type: GrantFiled: February 8, 2012Date of Patent: June 16, 2015Assignee: 3M Innovative Properties CompanyInventors: Guy D. Joly, Larry R. Krepski, Babu N. Gaddam, Ahmed S. Abuelyaman, Bradley D. Craig, Timothy D. Dunbar, Chuntao Cao, Joel D. Oxman, Afshin Falsafi, William H. Moser, Hoa T. Bui
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Patent number: 9012531Abstract: Hardenable compositions are described comprising at least one multifunctional ethylenically unsaturated isocyanurate monomer and at least one multifunctional ethylenically unsaturated tricyclodecane monomer. In favored embodiments, the compositions further comprise filler and are suitable dental restorations.Type: GrantFiled: February 6, 2012Date of Patent: April 21, 2015Assignee: 3M Innovative Properties CompanyInventors: Ahmed S. Abuelyaman, Adrian S. Eckert, Sumita B. Mitra, Timothy D. Dunbar, Bradley D. Craig, Chuntao Cao
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Patent number: 8834832Abstract: A process comprises (a) combining (1) at least one base and (2) at least one metal carboxylate salt comprising (i) a metal cation selected from metal cations that form amphoteric metal oxides or oxyhydroxides and (ii) a lactate or thiolactate anion, or metal carboxylate salt precursors comprising (i) at least one metal salt comprising the metal cation and a non-interfering anion and (ii) lactic or thiolactic acid, a lactate or thiolactate salt of a non-interfering, non-metal cation, or a mixture thereof; and (b) allowing the base and the metal carboxylate salt or metal carboxylate salt precursors to react.Type: GrantFiled: December 16, 2008Date of Patent: September 16, 2014Assignee: 3M Innovative Properties CompanyInventor: Timothy D. Dunbar
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Publication number: 20140220512Abstract: Hardenable compositions are described comprising at least one multifunctional ethylenically unsaturated isocyanurate monomer and at least one multifunctional ethylenically unsaturated tricyclodecane monomer. In favored embodiments, the compositions further comprise filler and are suitable dental restorations.Type: ApplicationFiled: February 6, 2012Publication date: August 7, 2014Applicant: 3M INNOVATIVE PROPERTIES COMPANYInventors: Ahmed S. Abuelyaman, Adrian S. Eckert, Sumita B. Mitra, Timothy D. Dunbar, Bradley D. Craig, Chuntao Cao
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Publication number: 20130316307Abstract: Dental compositions are described comprising an addition-fragmentation agent comprising at least one ethylenically unsaturated terminal group and a backbone unit comprising an ?,?-unsaturated carbonyl; at least one monomer comprising at least two ethylenically unsaturated group; and inorganic oxide filler. The addition-fragmentation agent is preferably free-radically cleavable. The addition-fragmentation agent preferably comprises at least two ethylenically unsaturated terminal groups, such as (meth)acTylate groups. In some embodiments, the addition-fragmentation agent has the formula: wherein R1, R2 and R3 are each independently Zm, -Q-, a (hetero)alkyl group or a (hetero)aryl group with the proviso that at least one of R1, R2 and R3 is Zm-Q-; Q is a linking group have a valence of m+1; Z is an ethylenically unsaturated polymerizable group; m is 1 to 6; each X1 is independently —O— or —NR4—, where R4 is H or C1-C4 alkyl; and n is 0 or 1.Type: ApplicationFiled: February 8, 2012Publication date: November 28, 2013Applicant: 3M INNOVATIVE PROPERTIES COMPANYInventors: Guy D. Joly, Larry R. Krepski, Babu N. Gaddam, Ahmed S. Abuelyaman, Bradley D. Craig, Timothy D. Dunbar, Chuntao Cao, Joel D. Oxman, Afshin Falsafi, William H. Moser, Hoa T. Bui
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Patent number: 8383682Abstract: A composition comprises surface-modified nanoparticles of at least one amphoteric metal oxide or oxyhydroxide. The nanoparticles bear, on at least a portion of their surfaces, a surface modification comprising (i) at least one surface modifier selected from lactate, thiolactate, and mixtures thereof, and (ii) at least one surface modifier selected from halide, nitrate, acetate, carbonate, formate, propionate, sulfate, bromate, perchlorate, tribromoacetate, trichloroacetate, trifluoroacetate, carboxylate comprising from one to about four alkyleneoxy moieties, chlorate, and mixtures thereof.Type: GrantFiled: December 16, 2008Date of Patent: February 26, 2013Assignee: 3M Innovative Properties CompanyInventor: Timothy D. Dunbar
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Patent number: 8236277Abstract: A process comprises (a) combining (1) at least one base and (2) at least one metal carboxylate salt comprising (i) a metal cation selected from metal cations that form amphoteric metal oxides or oxyhydroxides and (ii) a carboxylate anion comprising from one to four alkyleneoxy moieties, or metal carboxylate salt precursors comprising (i) at least one metal salt comprising the metal cation and a non-interfering anion and (ii) at least one carboxylic acid comprising from one to four alkyleneoxy moieties, at least one salt of the carboxylic acid and a non-interfering, non-metal cation, or a mixture thereof; and (b) allowing the base and the metal carboxylate salt or metal carboxylate salt precursors to react.Type: GrantFiled: December 18, 2007Date of Patent: August 7, 2012Assignee: 3M Innovative Properties CompanyInventor: Timothy D. Dunbar