Patents by Inventor Sergej-Tomislav Buljan
Sergej-Tomislav Buljan 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: 8795034Abstract: A dressing blade for finishing and reconditioning new and used abrasive grinding and cutting tools has a slab-shaped shank with an extension protruding longitudinally from the shank. Superabrasive grains are disposed on the surface of the extension and held in place by a brazed metal composition. This composition is formed by brazing a powdered mixture of brazing metal components and active metal components. Specific extension configurations are provided which allow aligning the superabrasive grains in single layer arrangement for precise dressing and simple fabrication of the tool. The novel dressing tool exhibits excellent wear characteristics.Type: GrantFiled: December 5, 2007Date of Patent: August 5, 2014Assignee: Saint-Gobain Abrasives, Inc.Inventors: Richard M. Andrews, Sergej-Tomislav Buljan, Earl G. Geary, Jr., Robert L. Owen, Marcus R. Skeem
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Patent number: 8579681Abstract: A disc-shaped, rotary dressing tool has a rigid core and an abrasive rim around at least one surface of the periphery of the rigid core. The rigid core and the abrasive rim are oriented in a direction orthogonal to the axis of rotation of the tool. In an embodiment, the abrasive rim comprises an abrasive component bonded to the rigid core by means of an active braze. The abrasive component can be diamond grains arranged in a single layer or diamond film inserts. In a particular embodiment, the abrasive component can comprise a plurality of abrasive inserts mechanically fastened to the rigid core. In another embodiment, the abrasive rim can comprise strips of an abrasive component with each strip being filled into slots machined into and through the perimeter of the core.Type: GrantFiled: June 4, 2012Date of Patent: November 12, 2013Assignee: Saint-Gobain Abrasives, Inc.Inventors: Richard M. Andrews, Sergej-Tomislav Buljan
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Publication number: 20120244791Abstract: A disc-shaped, rotary dressing tool has a rigid core and an abrasive rim around at least one surface of the periphery of the rigid core. The rigid core and the abrasive rim are oriented in a direction orthogonal to the axis of rotation of the tool. In an embodiment, the abrasive rim comprises an abrasive component bonded to the rigid core by means of an active braze. The abrasive component can be diamond grains arranged in a single layer or diamond film inserts. In a particular embodiment, the abrasive component can comprise a plurality of abrasive inserts mechanically fastened to the rigid core. In another embodiment, the abrasive rim can comprise strips of an abrasive component with each strip being filled into slots machined into and through the perimeter of the core.Type: ApplicationFiled: June 4, 2012Publication date: September 27, 2012Applicant: SAINT-GOBAIN ABRASIVES, INC.Inventors: Richard M. Andrews, Sergej-Tomislav Buljan
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Patent number: 8192256Abstract: A disc-shaped, rotary dressing tool has a rigid core and an abrasive rim around at least one surface of the periphery of the rigid core, the rigid core and the abrasive rim being oriented in a direction orthogonal to the axis of rotation of the tool. The abrasive rim comprises an abrasive component bonded to the rigid core by means of an active braze, and the abrasive component is diamond grains arranged in a single layer or diamond film inserts. The abrasive rim may comprise a plurality of abrasive inserts mechanically fastened to the rigid core and comprising an abrasive component bonded to a backing element by means of an active braze.Type: GrantFiled: June 2, 2006Date of Patent: June 5, 2012Assignees: Saint-Gobain Abrasives, Inc., Saint-Gobain AbrasifsInventors: Richard M. Andrews, Sergej-Tomislav Buljan
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Patent number: 7883398Abstract: An abrasive tool, suitable for cutting, slotting, grinding and polishing hard materials, such as ceramics, metals, and composites thereof, and methods for making same. The tool includes a plurality of pores positioned in an abrasive region adjacent an outer circumference of the disk. The pores have any predetermined shape, size and position relative to one another.Type: GrantFiled: August 11, 2005Date of Patent: February 8, 2011Assignee: Saint-Gobain Abrasives, Inc.Inventors: Sergej-Tomislav Buljan, Srinivasan Ramanath, Donald Brodeur, Robert F. Corcoran
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Publication number: 20080271384Abstract: Tools for conditioning chemical mechanical planarization (CMP) pads comprise a substrate with abrasive particles coupled to at least one surface. The tools can have various particle and bond configurations. For instance, abrasive particles may be bonded (e.g., brazed or other metal bond technique) to one side, or to front and back sides. Alternatively, abrasive particles are bonded to a front side, and filler particles coupled to a back side. The abrasive particles can form a pattern (e.g., hexagonal) and have particle sizes that are sufficiently small to penetrate pores of a CMP pad during conditioning, leading to fewer defects on wafers polished with the conditioned CMP pad. Grain bonding can be accomplished using brazing films, although other metal bonds may be used as well. Also, balanced bond material (e.g., braze on both sides) allows for low out-of-flatness value.Type: ApplicationFiled: September 19, 2007Publication date: November 6, 2008Applicant: SAINT-GOBAIN CERAMICS & PLASTICS, INC.Inventors: Thomas Puthanangady, Taewook Hwang, Srinivasan Ramanath, Eric M. Schultz, J. Gary Baldoni, Sergej-Tomislav Buljan, Charles Dinh-Ngoc
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Publication number: 20080076338Abstract: A dressing blade for finishing and reconditioning new and used abrasive grinding and cutting tools has a slab-shaped shank with an extension protruding longitudinally from the shank. Superabrasive grains are disposed on the surface of the extension and held in place by a brazed metal composition. This composition is formed by brazing a powdered mixture of brazing metal components and active metal components. Specific extension configurations are provided which allow aligning the superabrasive grains in single layer arrangement for precise dressing and simple fabrication of the tool. The novel dressing tool exhibits excellent wear characteristics.Type: ApplicationFiled: December 5, 2007Publication date: March 27, 2008Applicant: SAINT-GOBAIN ABRASIVES, INC.Inventors: Richard Andrews, Sergej-Tomislav Buljan, Earl Geary, Robert Owen, Marcus Skeem
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Patent number: 7195549Abstract: A drum grinding wheel includes an elongated drum configured for coaxial engagement with a spindle of a grinding machine. An exterior surface of the drum extends parallel to a central axis, and a plurality of removable cutters are removably fastened to the exterior surface. Each of the cutters has a plurality of ribs disposed in spaced relation thereon, and abrasive grain is disposed on a grinding face of each of the ribs, such as by use of a metallic braze.Type: GrantFiled: August 23, 2004Date of Patent: March 27, 2007Assignee: Saint-Gobain Abrasives, Inc.Inventors: J. Gary Baldoni, Sergej-Tomislav Buljan, Eric M. Schulz
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Publication number: 20070037501Abstract: An abrasive tool, suitable for cutting, slotting, grinding and polishing hard materials, such as ceramics, metals, and composites thereof, and methods for making same. The tool includes a plurality of pores positioned in an abrasive region adjacent an outer circumference of the disk. The pores have any predetermined shape, size and position relative to one another.Type: ApplicationFiled: August 11, 2005Publication date: February 15, 2007Applicant: Saint-Gobain Abrasives, Inc.Inventors: Sergej-Tomislav Buljan, Srinivasan Ramanath, Donald Brodeur, Robert Corcoran
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Publication number: 20050260939Abstract: A dressing blade for finishing and reconditioning new and used abrasive grinding and cutting tools has a slab-shaped shank with an extension protruding longitudinally from the shank. Superabrasive grains are disposed on the surface of the extension and held in place by a brazed metal composition. This composition is formed by brazing a powdered mixture of brazing metal components and active metal components. Specific extension configurations are provided which allow aligning the superabrasive grains in single layer arrangement for precise dressing and simple fabrication of the tool. The novel dressing tool exhibits excellent wear characteristics.Type: ApplicationFiled: May 18, 2004Publication date: November 24, 2005Applicant: Saint-Gobain Abrasives, Inc.Inventors: Richard Andrews, Sergej-Tomislav Buljan, Earl Geary, Robert Owen, Marcus Skeem
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Patent number: 6935940Abstract: This invention relates to an abrasive cutting tool comprising: i) a substrate surface having a plurality of teeth extending therefrom, and ii) a single layer of abrasive grains chemically bonded to at least a portion of each tooth to define a plurality of cutting levels parallel to the substrate surface, the cutting levels comprising a first uppermost cutting level and a second uppermost cutting level, the grains having a predetermined concentration, size and toughness, whereby the abrasive cutting tool has a cutting surface with a negative angle of inclination with respect to an intended direction of cutting.Type: GrantFiled: October 12, 2004Date of Patent: August 30, 2005Assignee: Saint-Gobain Abrasives Technology CompanyInventors: Marcus R. Skeem, Sergej-Tomislav Buljan, Jean Kramp
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Publication number: 20050048879Abstract: This invention relates to a method of cutting, comprising the steps of: a) providing an abrasive cutting tool comprising: i) a substrate surface having a plurality of teeth extending therefrom, and ii) a single layer of abrasive grains chemically bonded to at least a portion of each tooth to define a plurality of cutting levels parallel to the substrate surface, the cutting levels comprising a first uppermost cutting level and a second uppermost cutting level, the grains having a predetermined concentration, size and toughness, b) moving the substrate surface in an intended direction of rotation, c) contacting the uppermost cutting level of at least one tooth to a workpiece at a point of contact, d) applying a constant force to the tool directed at the point of contact, wherein the constant force is sufficient to cut the workpiece, the strength of the bond is sufficient to resist peeling, the predetermined concentration, size and toughness of the plurality of grains are such that the grains of the uppermost cType: ApplicationFiled: October 12, 2004Publication date: March 3, 2005Inventors: Marcus Skeem, Sergej-Tomislav Buljan, Jean Kramp
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Patent number: 6817936Abstract: This invention relates to a method of cutting, comprising the steps of: a) providing an abrasive cutting tool comprising: i) a substrate surface having a plurality of teeth extending therefrom, and ii) a single layer of abrasive grains chemically bonded to at least a portion of each tooth to define a plurality of cutting levels parallel to the substrate surface, the cutting levels comprising a first uppermost cutting level and a second uppermost cutting level, the grains having a predetermined concentration, size and toughness, b) moving the substrate surface in an intended direction of rotation, c) contacting the uppermost cutting level of at least one tooth to a workpiece at a point of contact, d) applying a constant force to the tool directed at the point of contact, wherein the constant force is sufficient to cut the workpiece, the strength of the bond is sufficient to resist peeling, the predetermined concentration, size and toughness of the plurality of grains are such that the grains of the uppeType: GrantFiled: July 15, 1997Date of Patent: November 16, 2004Assignee: Saint-Gobain Abrasives Technology CompanyInventors: Marcus R. Skeem, Sergej-Tomislav Buljan, Jean Kramp
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Patent number: 6755729Abstract: An abrasive article including from about 40 to about 80 volume percent interconnected porosity, the article being useful as a segment for a segmented grinding wheel, and a method for fabricating the same. The method includes blending a mixture of abrasive grain, bond material and dispersoid particles, the mixture including from about 40 to about 80 volume percent dispersoid particles. In one embodiment the mixture includes from about 50 to about 80 volume percent dispersoid particles. In another embodiment the mixture includes an organic bond material and from about 40 to about 80 volume percent dispersoid particles. The powder mixture is then pressed into an abrasive laden composite and thermally processed. After cooling the composite is immersed into a solvent, which dissolves substantially all of the dispersoid particles, leaving a highly porous, bonded abrasive article.Type: GrantFiled: June 18, 2003Date of Patent: June 29, 2004Assignee: Saint-Cobain Abrasives Technology CompanyInventors: Srinivasan Ramanath, Sergej-Tomislav Buljan, Jason R. Wilson, Jeri Ann S. Ikeda
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Patent number: 6685755Abstract: An abrasive article including from about 40 to about 80 volume percent interconnected porosity, the article being useful as a segment for a segmented grinding wheel, and a method for fabricating the same. The method includes blending a mixture of abrasive grain, bond material and dispersoid particles, the mixture including from about 40 to about 80 volume percent dispersoid particles. In one embodiment the mixture includes from about 50 to about 80 volume percent dispersoid particles. In another embodiment the mixture includes an organic bond material and from about 40 to about 80 volume percent dispersoid particles. The powder mixture is then pressed into an abrasive laden composite and thermally processed. After cooling the composite is immersed into a solvent, which dissolves substantially all of the dispersoid particles, leaving a highly porous, bonded abrasive article.Type: GrantFiled: November 21, 2001Date of Patent: February 3, 2004Assignee: Saint-Gobain Abrasives Technology CompanyInventors: Srinivasan Ramanath, Sergej-Tomislav Buljan, Jason R. Wilson, Jeri Ann S. Ikeda
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Publication number: 20030232586Abstract: An abrasive article including from about 40 to about 80 volume percent interconnected porosity, the article being useful as a segment for a segmented grinding wheel, and a method for fabricating the same. The method includes blending a mixture of abrasive grain, bond material and dispersoid particles, the mixture including from about 40 to about 80 volume percent dispersoid particles. In one embodiment the mixture includes from about 50 to about 80 volume percent dispersoid particles. In another embodiment the mixture includes an organic bond material and from about 40 to about 80 volume percent dispersoid particles. The powder mixture is then pressed into an abrasive laden composite and thermally processed. After cooling the composite is immersed into a solvent, which dissolves substantially all of the dispersoid particles, leaving a highly porous, bonded abrasive article.Type: ApplicationFiled: June 18, 2003Publication date: December 18, 2003Inventors: Srinivasan Ramanath, Sergej-Tomislav Buljan, Jason R. Wilson, Jeri Ann S. Ikeda
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Publication number: 20030097800Abstract: An abrasive article including from about 40 to about 80 volume percent interconnected porosity, the article being useful as a segment for a segmented grinding wheel, and a method for fabricating the same. The method includes blending a mixture of abrasive grain, bond material and dispersoid particles, the mixture including from about 40 to about 80 volume percent dispersoid particles. In one embodiment the mixture includes from about 50 to about 80 volume percent dispersoid particles. In another embodiment the mixture includes an organic bond material and from about 40 to about 80 volume percent dispersoid particles. The powder mixture is then pressed into an abrasive laden composite and thermally processed. After cooling the composite is immersed into a solvent, which dissolves substantially all of the dispersoid particles, leaving a highly porous, bonded abrasive article.Type: ApplicationFiled: November 21, 2001Publication date: May 29, 2003Inventors: Srinivasan Ramanath, Sergej-Tomislav Buljan, Jason R. Wilson, Jeri Ann S. Ikeda
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Patent number: 6485532Abstract: A straight, thin, monolithic abrasive wheel formed of hard and rigid abrasive grains and a sintered bond including a metal component and an active metal component exhibits superior stiffness. The metal component can be selected from among many sinterable metal compositions. The active metal is a metal capable of reacting to form a bond with the abrasive grains at sintering conditions and is present in an amount effective to integrate the grains and sintered bond into a grain-reinforced composite. A diamond abrasive, copper/tin/titanium sintered bond abrasive wheel is preferred. Such a wheel is useful for abrading operations in the electronics industry, such as cutting silicon wafers and alumina-titanium carbide pucks. The stiffness of the novel abrasive wheels is higher than conventional straight monolithic wheels and therefore improved cutting precision and less chipping can be attained without increase of wheel thickness and concomitant increased kerf loss.Type: GrantFiled: December 21, 2000Date of Patent: November 26, 2002Assignee: Saint-Gobain Abrasives Technology CompanyInventors: Richard M. Andrews, Sergej-Tomislav Buljan, Srinivasan Ramanath, Earl G. Geary
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Patent number: 6245443Abstract: A bond for a metal single layer abrasive tool can be easily chemically and electrochemically stripped from the metal core of a recovered used tool to facilitate reuse of the core. Relative to conventionally bonded tools, the speed of stripping the novel bond is quick, and the stripped core has a smooth, clean surface which needs only minimal mechanical repair prior to reuse. The composition of the novel bond consists essentially of copper, tin and titanium. It can be brazed at temperatures below diamond graphitization and is chemically compatible with diamond. Hence, the bond is particularly useful for the manufacture of large diameter, superabrasive metal single layer abrasive wheels employed in the construction industry. The bond can be applied to the cutting surface of the abrasive tool as a uniform mixture of bronze alloy, titanium compound and copper powders. The powders may be mixed with a liquid vehicle and applied as a paste.Type: GrantFiled: August 28, 1996Date of Patent: June 12, 2001Assignee: Norton CompanyInventors: Ren-Kae Shiue, Thomas W. Eagar, Bradley Miller, Sergej-Tomislav Buljan
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Publication number: 20010002356Abstract: A straight, thin, monolithic abrasive wheel formed of hard and rigid abrasive grains and a sintered bond including a metal component and an active metal component exhibits superior stiffness. The metal component can be selected from among many sinterable metal compositions. The active metal is a metal capable of reacting to form a bond with the abrasive grains at sintering conditions and is present in an amount effective to integrate the grains and sintered bond into a grain-reinforced composite. A diamond abrasive, copper/tin/titanium sintered bond abrasive wheel is preferred. Such a wheel is useful for abrading operations in the electronics industry, such as cutting silicon wafers and alumina-titanium carbide pucks. The stiffness of the novel abrasive wheels is higher than conventional straight monolithic wheels and therefore improved cutting precision and less chipping can be attained without increase of wheel thickness and concomitant increased kerf loss.Type: ApplicationFiled: December 21, 2000Publication date: May 31, 2001Inventors: Richard M. Andrews, Sergej-Tomislav Buljan, Srinivasan Ramanath, Earl G. Geary