Patents by Inventor Ralf Kollefrath
Ralf Kollefrath 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: 10716644Abstract: A dental instrument comprising a shaft and a working part adjoined thereto, with the working part having a coating in which abrasive bodies are embedded, is proposed, Firstly, the average proportion of the surface of the abrasive bodies which is covered by the coating can be at least 60%, preferably at least 65%, most preferably at least 70%. Secondly, the coating can, moreover, also consist of a nickel ahoy which additionally contains at least one element selected from the group consisting of titanium, vanadium, niobium, chromium, molybdenum, tungsten, manganese, iron and cobalt. In addition, a process for coating a working part, in particular for producing a dental instrument of this type, and also the use of such a dental instrument for cutting machining of solid bodies are proposed.Type: GrantFiled: June 29, 2017Date of Patent: July 21, 2020Assignee: COLTÈNE/WHALEDENT AGInventors: Ralf Kollefrath, Ulrich Müller, Martin Schlüter
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Publication number: 20180000558Abstract: A dental instrument comprising a shaft and a working part adjoined thereto, with the working part having a coating in which abrasive bodies are embedded, is proposed. Firstly, the average proportion of the surface of the abrasive bodies which is covered by the coating can be at least 60%, preferably at least 65%, most preferably at least 70%. Secondly, the coating can, moreover, also consist of a nickel alloy which additionally contains at least one element selected from the group consisting of titanium, vanadium, niobium, chromium, molybdenum, tungsten, manganese, iron and cobalt. In addition, a process for coating a working part, in particular for producing a dental instrument of this type, and also the use of such a dental instrument for cutting machining of solid bodies are proposed.Type: ApplicationFiled: June 29, 2017Publication date: January 4, 2018Inventors: Ralf KOLLEFRATH, Ulrich MÜLLER, Martin SCHLÜTER
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Publication number: 20140134572Abstract: A polymeric material is curable from an uncured state to a cured state and includes at least one finely dispersed filler. The material has in the cured state, a translucency in the range of about 30% to about 100%, and shore A hardness according to DIN 53505:1984 in the range of about 20 to about 70 and a tensile strength according to DIN 53504:1994 in the range of about 1.5 MPa to about 4.5 MPa. The material has in the uncured state, a consistency according to DIN ISO 4823:2000 of type 0 to 3.Type: ApplicationFiled: January 17, 2014Publication date: May 15, 2014Applicant: COLTENE AGInventors: Stephan Lampl, Dierk Lubbers, Ralf Kollefrath, Manfred Kalt
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Patent number: 8142833Abstract: The present invention is related to clear crosslinkable polymeric masses for the registration of fingerprints, allowing to obtain positive reproductions of fingerprints by taking a photograph through a clear cured layer obtained from said polymeric masses.Type: GrantFiled: January 9, 2006Date of Patent: March 27, 2012Assignee: Coltene AGInventors: Dierk Lubbers, Stephan Lampl, Ralf Kollefrath
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Patent number: 7998264Abstract: A hardenable dental material, exhibiting a reflectivity in the hardened state of preferably more than about 70%, measured according to EN ISO 2813 (1999) with an angle of incidence of 60°. The material provides for improved visual readability in the hardened state.Type: GrantFiled: May 2, 2006Date of Patent: August 16, 2011Assignee: Coltene Whaledent AGInventors: Dierk Lubbers, Ralf Kollefrath, Manfred Kalt
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Patent number: 7789663Abstract: The invention relates to a process of retraction of sulcus, comprising the steps of: applying a silicone material onto and/or at the vicinity of the boundary of a tooth and adjacent sulcus, which silicone material expands during or after its curing reaction; applying a cap onto said tooth, thereby forming a chamber over said silicone material, wherein said chamber comprises as its walls the tooth, the cap and an outer section of said sulcus; whereby said chamber allows for the silicone material to expand into the crevice between sulcus and tooth. Said cap is at least partially filled with a plastically deformable material when applied onto said tooth in step; and/or said cap is deformable, especially under biting pressure.Type: GrantFiled: March 8, 2005Date of Patent: September 7, 2010Assignee: Coltene AGInventors: Ralf Kollefrath, Stephan Lampl, Dierk Lubbers
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Publication number: 20100035213Abstract: Sulcus is retracted from teeth prior to performing a dental procedure on the teeth by applying an expandable curable silicone compound to the surface of the teeth and preventing the silicone compound from expanding in a direction away from the surface of the teeth, thereby forcing the silicone to expand against the sulcus and forcing retraction of the sulcus from contact with the teeth.Type: ApplicationFiled: August 5, 2009Publication date: February 11, 2010Applicant: COLTENE WHALEDENT AGInventors: Dierk Lubbers, Stephan Lampl, Ralf Kollefrath
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Patent number: 7549862Abstract: The invention relates to a process of retraction of sulcus, comprising the steps of: applying a silicone material onto and/or at the vicinity of the boundary of a tooth and adjacent sulcus, which silicone material expands during or after its curing reaction; applying a cap onto said tooth, thereby forming a chamber over said silicone material, wherein said chamber comprises as its walls the tooth, the cap and an outer section of said sulcus; whereby said chamber allows for the silicone material to expand into the crevice between sulcus and tooth. Said cap is at least partially filled with a plastically deformable material when applied onto said tooth in step; and/or said cap is deformable, especially under biting pressure.Type: GrantFiled: March 14, 2007Date of Patent: June 23, 2009Assignee: Coltene AGInventors: Ralf Kollefrath, Stephan Lampl, Dierk Lubbers
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Publication number: 20090061393Abstract: The invention concerns a method of retraction of sulcus, in which, in a first step, a flowable retraction material (1) is applied onto the sulcus (5) of at least one tooth (4). In a second step, a dental dam (2) is applied onto the tooth (4) and brought into contact with or in the vicinity of the retraction material (1). According to the invention, the retraction material (1) and the material of the dental dam (2) are chosen such that they can form a chemical bond with each other. Moreover, the invention concerns a dental kit (9) for performing the method, which dental kit (9) contains at least one flowable retraction material (1) and at least one dental dam (2), wherein the retraction material (1) and the dental dam (2) can form a chemical bond. Additionally, the invention concerns the use of a dental kit (9) in the method. Finally, the invention concerns a dental retraction device (10) containing a retraction material (1) and a dental (2), which have formed a chemical bond with each other.Type: ApplicationFiled: May 12, 2008Publication date: March 5, 2009Applicant: COLTENE WHALEDENT AGInventors: Ralf Kollefrath, Brigitte Pittner, Werner Mannschedel
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Publication number: 20070160952Abstract: The invention relates to a process of retraction of sulcus, comprising the steps of: applying a silicone material onto and/or at the vicinity of the boundary of a tooth and adjacent sulcus, which silicone material expands during or after its curing reaction; applying a cap onto said tooth, thereby forming a chamber over said silicone material, wherein said chamber comprises as its walls the tooth, the cap and an outer section of said sulcus; whereby said chamber allows for the silicone material to expand into the crevice between sulcus and tooth. Said cap is at least partially filled with a plastically deformable material when applied onto said tooth in step; and/or said cap is deformable, especially under biting pressure.Type: ApplicationFiled: March 14, 2007Publication date: July 12, 2007Inventors: Ralf Kollefrath, Stephan Lampl, Dierk Lubbers
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Publication number: 20070154861Abstract: A hardenable dental material, exhibiting a reflectivity in the hardened state of preferably more than about 70%, measured according to EN ISO 2813 (1999) with an angle of incidence of 600. The material provides for improved visual readability in the hardened state.Type: ApplicationFiled: May 2, 2006Publication date: July 5, 2007Inventors: Dierk Lubbers, Ralf Kollefrath, Manfred Kalt
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Publication number: 20070065770Abstract: Sulcus is retracted from teeth prior to perfroming a dental procedure on the teeth by applying an expandible curable silicone compound to the surface of the teeth and preventing the silicone compound from exanding in a direction away from the suface of the teeth, thereby forcing the silicone to expand against the sulcus and forcing retraction of the sulcus from contact with the teeth.Type: ApplicationFiled: October 10, 2006Publication date: March 22, 2007Inventors: Dierk Lubbers, Stephan Lampl, Ralf Kollefrath
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Publication number: 20060281856Abstract: A silicone material, preferably a multi-component addition-cured silicon impression compound, of at least one organopolysiloxane with at least two unsaturated groups in the molecule; at least one organohydrogenpolysiloxane with at least three SiH groups in the molecule; at least one platinum catalyst and at least one filler.Type: ApplicationFiled: June 9, 2006Publication date: December 14, 2006Inventors: Ralf Kollefrath, Silvan Benz
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Publication number: 20060165871Abstract: The present invention is related to clear crosslinkable polymeric masses for the registration of fingerprints, allowing to obtain positive reproductions of fingerprints by taking a photograph through a clear cured layer obtained from said polymeric masses.Type: ApplicationFiled: January 9, 2006Publication date: July 27, 2006Inventors: Dierk Lubbers, Stephan Lampl, Ralf Kollefrath
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Publication number: 20050202367Abstract: The invention relates to a process of retraction of sulcus, comprising the steps of: applying a silicone material onto and/or at the vicinity of the boundary of a tooth and adjacent sulcus, which silicone material expands during or after its curing reaction; applying a cap onto said tooth, thereby forming a chamber over said silicone material, wherein said chamber comprises as its walls the tooth, the cap and an outer section of said sulcus; whereby said chamber allows for the silicone material to expand into the crevice between sulcus and tooth. Said cap is at least partially filled with a plastically deformable material when applied onto said tooth in step; and/or said cap is deformable, especially under biting pressure.Type: ApplicationFiled: March 8, 2005Publication date: September 15, 2005Inventors: Ralf Kollefrath, Stephan Lampl, Dierk Lubbers
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Publication number: 20050069838Abstract: Sulcus is retracted from teeth prior to performing a dental procedure on the teeth by applying an expandible curable silicone compound to the surface of the teeth and preventing the silicone compound from exanding in a direction away from the suface of the teeth, thereby forcing the silicone to expand against the sulcus and forcing retraction of the sulcus from contact with the teeth.Type: ApplicationFiled: March 15, 2004Publication date: March 31, 2005Inventors: Ralf Kollefrath, Stephan Lampl, Dierk Lubbers
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Patent number: 5705589Abstract: The organosilanes and organopolysiloxanes containing groups which form free radicals and are soluble in organic solvents, processes for their preparation, macromonomers and graft copolymers from the organosilanes and organopolysiloxanes according to the invention as free radical initiators and organic monomers which can be polymerized by free radicals, a process for the preparation of the macromonomers and graft copolymers and their use.Type: GrantFiled: July 12, 1995Date of Patent: January 6, 1998Assignee: Wacker-Chemie GmbHInventors: Jochen Dauth, Bernward Deubzer, Oskar Nuyken, Brigette Voit, Ralf Kollefrath
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Patent number: 5548070Abstract: The organosilicon compounds have at least one Si--C-bonded organic radical which contains at least one triazene group. The organosilicon compounds can be employed as heat- and light-unstable free radical initiators for the preparation of homo-, graft co- and block copolymers from olefinically unsaturated compounds and for crosslinking organosilicon compounds and organic compounds which can be polymerized by free radical polymerization.Type: GrantFiled: July 19, 1994Date of Patent: August 20, 1996Assignee: Wacker-Chemie GmbHInventors: Jochen Dauth, Bernward Deubzer, Elfriede Mayer, Oskar Nuyken, Brigitte Voit, Ralf Kollefrath