Patents by Inventor Johannes HOMA
Johannes HOMA 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: 10967564Abstract: A method for the layered construction of a shaped body of highly viscous photopolymerizable material, includes forming layers of the shaped body one after the other and one on top of the other by each forming a material layer of predetermined thickness (a) of the highly viscous photopolymerizable material in a tank, lowering a construction platform, or the shaped body at least partially formed on the construction platform, into the material layer so as to cause a layer of the highly viscous photopolymerizable material to form between the construction platform or the shaped body and the tank bottom, curing such layer in a position-selective manner, in particular by irradiation through the tank bottom, to provide the desired shape of the shaped body layer, wherein the thickness (a) of the material layer is varied at least once during the layered construction of the shaped body.Type: GrantFiled: March 30, 2016Date of Patent: April 6, 2021Assignee: Lithoz GmbHInventors: Johannes Homa, Johannes Patzer, Rafael Reiter, Manfred Spitzbart
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Publication number: 20210031257Abstract: A method for producing a casting mould for filling with melt and/or a core for producing a hollow space in a cast part, includes forming a wall made of a refractory and gas-permeable material. The wall is formed to include an inner wall and a support structure built up in successive layers against the inner wall. The inner wall is formed with an inner surface defining a roughness matching the surface roughness of the part that is to be cast in the mould. A generative manufacturing method generates the successive layers of the support structure, which includes open and/or closed hollow spaces and/or different thicknesses of the successive layers of the support structure that supports the casting mould independently against the casting pressure in a dimensionally stable manner and also isolates or dissipates thermal energy in the melt in a targeted manner.Type: ApplicationFiled: March 20, 2019Publication date: February 4, 2021Inventors: JOHANNES HOMA, MANFRED SPITZBART, DOMINIK REICHARTZEDER, PETER SCHNEIDER, BERTRAM KAWLATH, ARMIN RAAB, HOLGER REICHENBAECHER
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Patent number: 10864675Abstract: A method for the layered construction of a shaped body of highly viscous photopolymerizable material, where layers of said shaped body are formed one after the other and one on top of the other, includes forming a material layer of predetermined thickness (a) of the highly viscous photopolymerizable material in a tank, which has a bottom, and lowering the construction platform, or the shaped body at least partially formed on the construction platform, into the material layer so as to cause a layer of the highly viscous photopolymerizable material to form between the construction platform or shaped body and the tank bottom, which layer is cured in a position-selective manner, in particular by irradiation through the tank bottom, to provide the desired shape of the shaped body layer, in which at least one material layer includes a layer thickness variation in the lateral direction.Type: GrantFiled: March 30, 2016Date of Patent: December 15, 2020Assignee: Lithoz GmbHInventors: Johannes Homa, Johannes Patzer, Rafael Reiter, Manfred Spitzbart
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Publication number: 20180117835Abstract: A method for the layered construction of a shaped body of highly viscous photopolymerizable material, includes forming layers of the shaped body one after the other and one on top of the other by each forming a material layer of predetermined thickness (a) of the highly viscous photopolymerizable material in a tank, lowering a construction platform, or the shaped body at least partially formed on the construction platform, into the material layer so as to cause a layer of the highly viscous photopolymerizable material to form between the construction platform or the shaped body and the tank bottom, curing such layer in a position-selective manner, in particular by irradiation through the tank bottom, to provide the desired shape of the shaped body layer, wherein the thickness (a) of the material layer is varied at least once during the layered construction of the shaped body.Type: ApplicationFiled: March 30, 2016Publication date: May 3, 2018Inventors: Johannes HOMA, Johannes PATZER, Rafael REITER, Manfred SPITZBART
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Publication number: 20180071978Abstract: A method for the layered construction of a shaped body of highly viscous photopolymerizable material, where layers of said shaped body are formed one after the other and one on top of the other, includes forming a material layer of predetermined thickness (a) of the highly viscous photopolymerizable material in a tank, which has a bottom, and lowering the construction platform, or the shaped body at least partially formed on the construction platform, into the material layer so as to cause a layer of the highly viscous photopolymerizable material to form between the construction platform or shaped body and the tank bottom, which layer is cured in a position-selective manner, in particular by irradiation through the tank bottom, to provide the desired shape of the shaped body layer, in which at least one material layer includes a layer thickness variation in the lateral direction.Type: ApplicationFiled: March 30, 2016Publication date: March 15, 2018Inventors: Johannes HOMA, Johannes PATZER, Rafael REITER, Manfred SPITZBART
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Patent number: 9764513Abstract: The invention relates to a method for the construction of a shaped body from photopolymerizable material by using lithography-based generative production, in which a layer of liquid photopolymerizable material is defined on a production platform, and is polymerized in an exposure region having a predetermined contour, a further layer of photopolymerizable material is defined, the layer defined last is polymerized in an exposure region having a predetermined contour for the layer defined last, and the latter two steps are repeated until a shaped body having a predetermined shape has been formed by the sequence of cured layers with contours predetermined layer by layer, each exposure in an exposure region having a predetermined contour being carried out by controlled activation of individual exposure elements in a two-dimensional array of exposure elements, each exposure element being assigned an image element, wherein the exposure of the exposure region is carried out by a common light source and by a two-dimeType: GrantFiled: August 21, 2013Date of Patent: September 19, 2017Assignees: Ivoclar Vivadent AG, Technische Universität WienInventors: Jürgen Stampfl, Johannes Homa, Johannes Patzer, Gerald Mitteramskogler, Jörg Ebert, Jürgen Laubersheimer, Wolfgang Wachter
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Patent number: 9403726Abstract: A process for the preparation of a ceramic or glass ceramic shaped article using stereolithography and using a slip based on a radically polymerizable binder, polymerization initiator and filler, which comprises (A) at least one acidic monomer of general formula I (B) photoinitiator, and (C) ceramic and/or glass ceramic particles.Type: GrantFiled: March 7, 2014Date of Patent: August 2, 2016Assignee: Ivoclar Vivadent AGInventors: Urs Karl Fischer, Norbert Moszner, Volker Rheinberger, Wolfgang Wachter, Johannes Homa, Werner Längle
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Publication number: 20150258732Abstract: The invention relates to a method for the construction of a shaped body from photopolymerizable material by using lithography-based generative production, in which a layer of liquid photopolymerizable material is defined on a production platform, and is polymerized in an exposure region having a predetermined contour, a further layer of photopolymerizable material is defined, the layer defined last is polymerized in an exposure region having a predetermined contour for the layer defined last, and the latter two steps are repeated until a shaped body having a predetermined shape has been formed by the sequence of cured layers with contours predetermined layer by layer, each exposure in an exposure region having a predetermined contour being carried out by controlled activation of individual exposure elements in a two-dimensional array of exposure elements, each exposure element being assigned an image element, wherein the exposure of the exposure region is carried out by a common light source and by a two-dimeType: ApplicationFiled: August 21, 2013Publication date: September 17, 2015Inventors: Jürgen Stampfl, Johannes Homa, Johannes Patzer, Gerald Mitteramskogler, Jörg Ebert, Jürgen Laubersheimer, Wolfgang Wachter
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Patent number: 9079357Abstract: The invention relates to a method for the layered construction of a shaped body made of highly viscous photopolymerizable material.Type: GrantFiled: March 23, 2012Date of Patent: July 14, 2015Assignees: Ivoclar Vivadent AG, Technische Universität WienInventors: Jörg Ebert, Johannes Homa, Jürgen Laubersheimer, Johannes Patzer, Jürgen Stampfl, Wolfgang Wachter
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Publication number: 20140183799Abstract: A process for the preparation of a ceramic or glass ceramic shaped article using stereolithography and using a slip based on a radically polymerizable binder, polymerization initiator and filler, which comprises (A) at least one acidic monomer of general formula I (B) photoinitiator, and (C) ceramic and/or glass ceramic particles.Type: ApplicationFiled: March 7, 2014Publication date: July 3, 2014Applicant: Ivoclar Vivadent AGInventors: Urs Karl Fischer, Norbert Moszner, Volker Rheinberger, Wolfgang Wachter, Johannes Homa, Werner Längle
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Publication number: 20120248657Abstract: The invention relates to a method for the layered construction of a shaped body made of highly viscous photopolymerizable material.Type: ApplicationFiled: March 23, 2012Publication date: October 4, 2012Applicants: TECHNISCHE UNIVERSITAT WIEN, IVOCLAR VIVADENT AGInventors: Jörg Ebert, Johannes Homa, Jürgen Laubersheimer, Johannes Patzer, Jürgen Stampfl, Wolfgang Wachter
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Publication number: 20120010066Abstract: Slip based on radically polymerizable binder, polymerization initiator and filler, which comprises (A) at least one acidic monomer of general formula I (HG-Y—)aX?Z—PG)b ??Formula I (B) photoinitiator, and (C) ceramic and/or glass ceramic particles.Type: ApplicationFiled: June 30, 2011Publication date: January 12, 2012Applicant: IVOCLAR VIVADENT AGInventors: Urs Karl Fischer, Norbert Moszner, Volker Rheinberger, Wolfgang Wachter, Johannes Homa, Werner Längle
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Publication number: 20100283188Abstract: The present invention relates to a method for the generative production of a shaped body (27) of material (5, 55) solidifiable under the effect of electromagnetic radiation, in particular a green compact for dental restoration, by means of a multiplicity of exposure steps (1001, 1002, 1003, 1004), characterized in that a new layer of material (5, 55) solidifiable under the effect of electromagnetic radiation, having a layer thickness which is less than or equal to half the penetration depth of the electromagnetic radiation into the solidifiable material (5, 55), is provided before an exposure step (1001, 1002, 1003, 1004), the layer provided is exposed in the exposure step (1001, 1002, 1003, 1004) only in a subregion (2001, 3001) of the shaped body layer to be formed, and a layer provided before a preceding exposure step, on which the new layer has been provided, being solidified together with the new layer in the exposed subregion (2001, 3001), and the exposed subregion (2001, 3001) is varied between the expType: ApplicationFiled: September 29, 2009Publication date: November 11, 2010Applicants: IVOCLAR VIVADENT AG, TECHNISCHE UNIVERSITAT WIENInventors: Gottfried ROHNER, Wolfgang WACHTER, Jürgen STAMPFL, Johannes PATZER, Johannes HOMA