Patents by Inventor Christos Angeletakis
Christos Angeletakis 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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Publication number: 20140004482Abstract: A dental agent that is applied to a dental substrate is disclosed and includes: at least one breakable capsule, microcapsule or combination thereof, wherein the at least one breakable capsule, microcapsule or combination thereof comprises at least one adhesive primer, or a combination thereof. Methods of applying contemplated dental agents are also disclosed that include: providing a dental agent, wherein the dental agent comprises at least one breakable capsule, microcapsule or a combination thereof, providing a dental substrate, applying the dental agent to the dental substrate, and breaking the at least one breakable capsule, microcapsule or combination thereof on the surface of the dental substrate.Type: ApplicationFiled: June 27, 2013Publication date: January 2, 2014Inventors: CHRISTOS ANGELETAKIS, Gregory J. Dorsman
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Patent number: 8318886Abstract: A method is described herein for the preparation of a resin that may be used as a component in formulations of hydrosilation cured vinyl disiloxanes to increase the hydrophilicity and thereby reduce the contact angle. The resin is a vinyl functionalized alkoxy-siloxylated polyether or polyester copolymer and the method involves reacting a hydride functionalized siloxane in the presence of a Lewis acid catalyst with (a) one or more of an alcohol, a polyether diol, a polyether polyol, a polyester diol or polyester polyol and (b) a hydride functionalized siloxane containing a terminal vinyl group directly bonded to a silicon atom. This resin can be used in the formulation of dental impression materials.Type: GrantFiled: August 23, 2010Date of Patent: November 27, 2012Inventor: Christos Angeletakis
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Publication number: 20110054138Abstract: A method is described herein for the preparation of a resin that may be used as a component in formulations of hydrosilation cured vinyl disiloxanes to increase the hydrophilicity and thereby reduce the contact angle. The resin is a vinyl functionalized alkoxy-siloxylated polyether or polyester copolymer and the method involves reacting a hydride functionalized siloxane in the presence of a Lewis acid catalyst with (a) one or more of an alcohol, a polyether diol, a polyether polyol, a polyester diol or polyester polyol and (b) a hydride functionalized siloxane containing a terminal vinyl group directly bonded to a silicon atom. This resin can be used in the formulation of dental impression materials.Type: ApplicationFiled: August 23, 2010Publication date: March 3, 2011Inventor: Christos Angeletakis
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Patent number: 7683148Abstract: A composition curable by a metathesis reaction upon mixing its components and comprising an olefin-containing substrate, a metathesis catalyst, and a reaction control agent for slowing the progress of the metathesis reaction. The metathesis catalyst is a ruthenium or osmium carbene complex catalyst having high activity and good air stability. In one embodiment, the catalyst is free of phosphine ligands. The reaction control agent is an organic compound that contains carbon-carbon double and/or triple bonds and one or more Group 14 atoms and is present in an amount effective to slow the progress of the metathesis reaction. In one embodiment, the olefin-containing substrate may comprise one or more oligomers or polymers having a >20 wt. % linear siloxane (Si—O—Si) backbone tethered and/or end-capped with functional olefin groups, such as cycloalkenyl group.Type: GrantFiled: June 30, 2006Date of Patent: March 23, 2010Assignee: Kerr CorporationInventor: Christos Angeletakis
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Patent number: 7645443Abstract: One-part and two-part compositions curable by a metathesis reaction comprising a resin containing a polyether-based substrate with at least two cycloolefin groups per molecule curable by a metathesis reaction with a metathesis catalyst. These compositions may optionally contain a reaction control agent for slowing the progress of the metathesis reaction. The metathesis catalyst can be a ruthenium carbene complex catalyst. The substrate may be, for example, a difunctional urethane polyester or polyether carboxylate containing norbornenyl end groups.Type: GrantFiled: February 21, 2006Date of Patent: January 12, 2010Assignee: Kerr CorporationInventor: Christos Angeletakis
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Patent number: 7625551Abstract: Two-part dental impression material curable by a metathesis reaction comprising a base paste with first and second resin components each containing at least two cycloolefin groups per molecule curable by a metathesis reaction with a metathesis catalyst. The first resin includes a urethane polyether or polyester carboxylate backbone terminated with the cycloolefin groups and the second resin includes an alkoxy-siloxane polyether or polyester carboxylate backbone terminated with the cycloolefin groups. The metathesis catalyst can be a ruthenium carbene complex catalyst.Type: GrantFiled: February 21, 2006Date of Patent: December 1, 2009Assignee: Kerr CorporationInventor: Christos Angeletakis
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Patent number: 7625991Abstract: A resin that may be used, for example, in dental impression materials, and a method of making the resin. The resin comprises an alkoxy-siloxane polyester or polyether carboxylate backbone functionalized with at least two cycloolefin groups capable of undergoing a metathesis reaction. The method of making the resin comprises reacting a hydride terminated siloxane with a polyether or polyester diol containing propylene oxide and ethylene oxide fragments, and a cycloolefinic group functionalized hydroxyalkyl carboxylic acid ester, in the presence of a Group 3 or 13 catalyst.Type: GrantFiled: February 21, 2007Date of Patent: December 1, 2009Assignee: Kerr CorporationInventors: Christos Angeletakis, Matthias Stender
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Patent number: 7396862Abstract: Dental composite filler materials comprise particles coated via an atomic layer deposition (ALD) process. The coating material has a different composition than the core particle. The difference in composition permits fine control over the refractive index of the coated particles, allowing good matching tooth enamel and to the binder materials used in the composite.Type: GrantFiled: February 6, 2004Date of Patent: July 8, 2008Inventors: Alan W. Weimer, Sotiris E. Pratsinis, Christos Angeletakis, Steven M. George
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Publication number: 20070197741Abstract: A resin that may be used, for example, in dental impression materials, and a method of making the resin. The resin comprises an alkoxy-siloxane polyester or polyether carboxylate backbone functionalized with at least two cycloolefin groups capable of undergoing a metathesis reaction. The method of making the resin comprises reacting a hydride terminated siloxane with a polyether or polyester diol containing propylene oxide and ethylene oxide fragments, and a cycloolefinic group functionalized hydroxyalkyl carboxylic acid ester, in the presence of a Group 3 or 13 catalyst.Type: ApplicationFiled: February 21, 2007Publication date: August 23, 2007Applicant: KERR CORPORATIONInventors: Christos Angeletakis, Matthias Stender
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Patent number: 7173097Abstract: A composition curable by a metathesis reaction upon mixing its components and comprising an olefin-containing substrate, a metathesis catalyst, and a reaction control agent for slowing the progress of the metathesis reaction. The metathesis catalyst is a ruthenium or osmium carbene complex catalyst having high activity and good air stability. In one embodiment, the catalyst is free of phosphine ligands. The reaction control agent is an organic compound that contains carbon-carbon double and/or triple bonds and one or more Group 14 atoms and is present in an amount effective to slow the progress of the metathesis reaction. In one embodiment, the olefin-containing substrate may comprise one or more oligomers or polymers having a >20 wt. % linear siloxane (Si—O—Si) backbone tethered and/or end-capped with functional olefin groups, such as cycloalkenyl groups.Type: GrantFiled: July 15, 2004Date of Patent: February 6, 2007Assignee: Kerr CorporationInventor: Christos Angeletakis
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Publication number: 20060241257Abstract: A composition curable by a metathesis reaction upon mixing its components and comprising an olefin-containing substrate, a metathesis catalyst, and a reaction control agent for slowing the progress of the metathesis reaction. The metathesis catalyst is a ruthenium or osmium carbene complex catalyst having high activity and good air stability. In one embodiment, the catalyst is free of phosphine ligands. The reaction control agent is an organic compound that contains carbon-carbon double and/or triple bonds and one or more Group 14 atoms and is present in an amount effective to slow the progress of the metathesis reaction. In one embodiment, the olefin-containing substrate may comprise one or more oligomers or polymers having a >20 wt.% linear siloxane (Si—O—Si) backbone tethered and/or end-capped with functional olefin groups, such as cycloalkenyl group.Type: ApplicationFiled: June 30, 2006Publication date: October 26, 2006Applicant: KERR CORPORATIONInventor: Christos Angeletakis
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Publication number: 20060171900Abstract: One-part and two-part compositions curable by a metathesis reaction comprising a resin containing a polyether-based substrate with at least two cycloolefin groups per molecule curable by a metathesis reaction with a metathesis catalyst. These compositions may optionally contain a reaction control agent for slowing the progress of the metathesis reaction. The metathesis catalyst can be a ruthenium carbene complex catalyst. The substrate may be, for example, a difunctional urethane polyester or polyether carboxylate containing norbornenyl end groups.Type: ApplicationFiled: February 21, 2006Publication date: August 3, 2006Applicant: KERR CORPORATIONInventor: Christos Angeletakis
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Publication number: 20060173091Abstract: Two-part dental impression material curable by a metathesis reaction comprising a base paste with first and second resin components each containing at least two cycloolefin groups per molecule curable by a metathesis reaction with a metathesis catalyst. The first resin includes a urethane polyether or polyester carboxylate backbone terminated with the cycloolefin groups and the second resin includes an alkoxy-siloxane polyether or polyester carboxylate backbone terminated with the cycloolefin groups. The metathesis catalyst can be a ruthenium carbene complex catalyst.Type: ApplicationFiled: February 21, 2006Publication date: August 3, 2006Applicant: KERR CORPORATIONInventor: Christos Angeletakis
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Patent number: 7060769Abstract: A method of controlled curing by a metathesis reaction upon mixing its components, the method including the step of mixing an olefin-containing substrate, a metathesis catalyst, and a reaction control agent. The metathesis catalyst is a ruthenium or osmium carbene complex catalyst, such as one containing an alkylidene ligand with basicity higher than that of tricyclohexylphosphine (PCy3) and a neutral electron donor ligand with a basicity lower than that of PCy3, whereby the catalyst initiates the metathesis reaction of the composition upon mixing with the substrate. The reaction control agent is effective to slow the progress of the metathesis reaction and prevent its completion in the absence of an elevated temperature. The control agent may be a hydrocarbon containing carbon-carbon double bonds and/or triple bonds, or maybe a modified hydrocarbon with one or more Group 14 or 15 atoms.Type: GrantFiled: May 6, 2003Date of Patent: June 13, 2006Assignee: Kerr CorporationInventor: Christos Angeletakis
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Patent number: 7060770Abstract: A composition curable by a metathesis reaction upon mixing its components and comprising an olefin-containing substrate, a metathesis catalyst, and a reaction control agent for slowing the progress of the metathesis reaction. The metathesis catalyst is a ruthenium or osmium curbene complex catalyst, such as one containing an alkylidene ligand with basicity higher than that of tricyclohexylphosphine (PCy3) and a neutral electron donor ligand with a basicity lower than that of PCy3, whereby the catalyst initiates the metathesis reaction of the composition upon mixing with the substrate. The reaction control agent is an organic compound that contains carbon-carbon double and/or triple bonds and one or more Group 14 atoms and is present in an amount effective to slow the progress of the metathesis reaction.Type: GrantFiled: May 6, 2003Date of Patent: June 13, 2006Assignee: Kerr CorporationInventor: Christos Angeletakis
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Patent number: 7001590Abstract: One-part and two-part compositions curable by a metathesis reaction comprising a resin containing a substrate with at least two cycloolefin groups per molecule curable by a metathesis reaction with a metathesis catalyst. These compositions may optionally contain a reaction control agent for slowing the progress of the metathesis reaction. The metathesis catalyst can be a ruthenium carbene complex catalyst. The substrate may be, for example, a difunctional or trifunctional carboxylate ester containing norbornenyl end groups.Type: GrantFiled: November 15, 2004Date of Patent: February 21, 2006Assignee: Kerr CorporationInventor: Christos Angeletakis
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Patent number: 6890968Abstract: A dental composite having high filler loading and low shrinkage thereby providing good strength and marginal integrity. Through the use of prepolymerized filler particles in combination with a structural filler and a nanofiller, the composite exhibits very low shrinkage and is useful in stress bearing restorations and in cosmetic restorations. The structural filler used is ground to a mean particle size of less than 0.5 ?m and the nanofiller has discrete particles of a mean particle size less than 100 nm to improve handling and mechanical characteristics. The prepolymerized filler particles also allow for less viscosity and better handling characteristics of the composite.Type: GrantFiled: September 4, 2002Date of Patent: May 10, 2005Assignee: Kerr CorporationInventors: Christos Angeletakis, Minh-Dang Son Nguyen, Alvin I. Kobashigawa
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Patent number: 6861386Abstract: A polymerizable composition including a resin system comprising oligomers or polymers functionalized with groups curable by ring opening metathesis polymerization, a metathesis catalyst, and a catalyst accelerator. In examples of the present invention, the composition includes a ruthenium carbene complex catalyst capable of initiating ring-opening metathesis polymerization of the composition and a silicone-based sulfosuccinate salt capable of accelerating the polymerization initiated by the catalyst. In another example, the invention includes a paste/paste system in which a base paste includes the polymerizable oligomer or polymer and the catalyst accelerator and in which a catalyst paste includes the catalyst dissolved in an inert solvent.Type: GrantFiled: December 6, 2002Date of Patent: March 1, 2005Assignee: Kerr CorporationInventors: Christos Angeletakis, Mingfei Chen
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Patent number: 6844409Abstract: A composition curable by a metathesis reaction and comprising an olefin-containing resin system and metathesis catalyst. The resin system comprises siloxane-based oligomers or polymers end-capped and/or tethered with olefin functional groups that are capable of undergoing a metathesis reaction. The composition also includes a ruthenium carbene complex catalyst, whereby the catalyst initiates the metathesis reaction of the composition. The oligomer or polymer may be, for example, one or a combination of a telechelic polydimethylsiloxane end-capped with norbornenylethyl groups, a polydimethylsiloxane tethered and end-capped with norbornenylethyl groups, a tri-functional polydimethylsiloxane end-capped with norbornenylethyl groups, or a quadri-functional polydimethylsiloxane end-capped with norbornenylethyl groups. The catalyst may be, for example, a ruthenium carbene complex, such as 1,3-bis-(2,4,6-trimethylphenyl)-2-(imidazolidinylidene) dichloro(o-isopropoxyphenylmethylene) ruthenium.Type: GrantFiled: May 6, 2003Date of Patent: January 18, 2005Assignee: Kerr CorporationInventors: Christos Angeletakis, Mingfei Chen
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Publication number: 20040254320Abstract: A composition curable by a metathesis reaction upon mixing its components and comprising an olefin-containing substrate, a metathesis catalyst, and a reaction control agent for slowing the progress of the metathesis reaction. The metathesis catalyst is a ruthenium or osmium carbene complex catalyst having high activity and good air stability. In one embodiment, the catalyst is free of phosphine ligands. The reaction control agent is an organic compound that contains carbon-carbon double and/or triple bonds and one or more Group 14 atoms and is present in an amount effective to slow the progress of the metathesis reaction. In one embodiment, the olefin-containing substrate may comprise one or more oligomers or polymers having a >20 wt. % linear siloxane (Si—O—Si) backbone tethered and/or end-capped with functional olefin groups, such as cycloalkenyl groups.Type: ApplicationFiled: July 15, 2004Publication date: December 16, 2004Applicant: Kerr CorporationInventor: Christos Angeletakis