Patents by Inventor Udo K. R. Fischer
Udo K. R. Fischer 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: 5718948Abstract: The invention relates to a coated cemented carbide body for rock drilling having a substrate containing at least one metal carbide and a binder metal and an at least partly covering coating comprising at least one diamond- or cBN-layer applied by CVD- or PVD-technique. The cemented carbide body has a core of cemented carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.Type: GrantFiled: March 17, 1994Date of Patent: February 17, 1998Assignee: Sandvik ABInventors: Stefan S. O. Ederyd, E. K. Staffen Soderberg, Udo K. R. Fischer
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Patent number: 5624068Abstract: The present invention relates to buttons, inserts and bodies for rock drilling, rock cutting, metal cutting and wear part applications. The buttons, inserts and bodies comprise cemented carbide provided with bodies and/or layers of CVD- or PVD-fabricated diamond and then HP/HT treated in the diamond stable area. The bodies of cemented carbide may have a uniform structure or a multi-structure containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.Type: GrantFiled: December 6, 1995Date of Patent: April 29, 1997Assignees: Sandvik AB, Diamant Boart Stratabit S.A.Inventors: Mats G. Waldenstrom, Udo K. R. Fischer, Lars H. Hillert, Mahlon D. Dennis
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Patent number: 5496638Abstract: The present invention relates to buttons, inserts and bodies for rock drilling, rock cutting, metal cutting and wear part applications. The buttons, inserts and bodies comprise cemented carbide provided with bodies and/or layers of CVD- or PVD-fabricated diamond and then HP/HT treated in the diamond stable area. The bodies of cemented carbide may have a uniform structure or a multi-structure containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.Type: GrantFiled: August 29, 1994Date of Patent: March 5, 1996Assignee: Sandvik ABInventors: Mats G. Waldenstro/ m, Udo K. R. Fischer, Lars H. Hillert, Mahlon D. Dennis
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Patent number: 5453241Abstract: The present invention relates to cemented carbide bodies preferably for rock drilling and mineral cutting. Due to the fact that the bodies are built up of a core of eta-phase-containing cemented carbide surrounded by a surface zone free of eta-phase with low Co-content in the surface zone and successively increasing Co-content to a maximum in the outer part of the eta-phase-core they have obtained an increase in toughness and life at practical use.Type: GrantFiled: September 22, 1993Date of Patent: September 26, 1995Assignee: Sandvik ABInventors: Jan Akerman, Udo K. R. Fischer, E. Torbjorn Hartzell
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Patent number: 5401461Abstract: The present invention relates to cemented carbide bodies preferably for wear demanding rock drilling and mineral cutting. The bodies are built up of a core of eta-phase-containing cemented carbide surrounded by a surface zone free of eta-phase where the binder phase content in the outer pan of said zone is lower than the nominal and, in addition, constant or near constant, and the binder phase content in the inner part of the eta-phase free zone closer to the eta-phase core is higher than the nominal. According to the method of the invention, bodies comprising evenly distributed eta-phase are subjected to a partly carburizing treatment with a carbon activity, a.sub.c, close to 1.Type: GrantFiled: September 22, 1993Date of Patent: March 28, 1995Assignee: Sandvik ABInventors: E. Torbjorn Hartzell, Jan Akerman, Udo K. R. Fischer
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Patent number: 5335738Abstract: The present invention relates to a rock bit button of cemented carbide for percussive or rotary crushing rock drilling. The button is provided with a layer of diamond produced at high pressure and high temperature in the diamond stable area.The cemented carbide has a multi-phase structure having a core that contains eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.Type: GrantFiled: June 14, 1991Date of Patent: August 9, 1994Assignee: Sandvik ABInventors: Mats G. Waldenstrom, Udo K. R. Fischer, Lars H. Hillert, Mahlon D. Dennis
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Patent number: 5286549Abstract: The present invention relates to cemented carbide bodies preferably for wear demanding rock drilling and mineral cutting. The bodies are built up of a core of eta-phase-containing cemented carbide surrounded by a surface zone free of eta-phase where the binder phase content in the outer part of said zone is lower than the nominal and, in addition, constant or near constant, and the binder phase content in the inner part of the eta-phase free zone closer to the eta-phase core is higher than the nominal. According to the method of the invention, bodies comprising evenly distributed eta-phase are subjected to a partly carburizing treatment with a carbon activity, a.sub.c, close to 1.Type: GrantFiled: February 18, 1992Date of Patent: February 15, 1994Assignee: Sandvik ABInventors: E. Torbjorn Hartzell, Jan Akerman, Udo K. R. Fischer
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Patent number: 5279901Abstract: The present invention relates to cemented carbide bodies preferably for rock drilling and mineral cutting. Due to the fact that the bodies are built up of a core of eta-phase-containing cemented carbide surrounded by a surface zone free of eta-phase with low Co-content in the surface zone and successively increasing Co-content to a maximum in the outer part of the eta-phase-core they have obtained an increase in toughness and life at practical use.Type: GrantFiled: February 5, 1992Date of Patent: January 18, 1994Assignee: Sandvik ABInventors: Jan Akerman, Udo K. R. Fischer, E. Torbjorn Hartzell
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Patent number: 5217081Abstract: The present invention relates to a rock bit insert of cemented carbide for cutting rock drilling. The insert is provided with one or more bodies or layers of diamond or cBN produced at high pressure and high temperature in the diamond or cBN stable area.The body of cemented carbide has a multi-structure containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase and having a low content of cobalt in the surface and a higher content of cobalt next to the eta-phase zone.Type: GrantFiled: June 14, 1991Date of Patent: June 8, 1993Assignees: Sandvik AB, Diamant Boart Stratabit S.A.Inventors: Mats G. Waldenstrom, Udo K. R. Fischer, Lars H. Hillert, Mahlon D. Dennis
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Patent number: 5154245Abstract: The present invention relates to a rock bit button of cemented carbide for percussive or rotary crushing rock drilling. The button is provided with one or more bodies of polycrystalline diamond in the surface produced at high pressure and high temperature in the diamond stable area. Each diamond body is completely surrounded by cemented carbide except the top surface.Type: GrantFiled: April 19, 1990Date of Patent: October 13, 1992Assignee: Sandvik ABInventors: Mats G. Waldenstrom, Udo K. R. Fischer, Lars H. Hillert, Mahlon D. Dennis
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Patent number: 4820482Abstract: The present invention relates to a cemented carbide body, preferably for rock drilling, mineral cutting and wear parts, in which the content of binder phase in the surface is lower and in the center higher than the nominal content. In the center there is a zone having a uniform content of binder phase. The WC grain size is uniform throughout the body.Type: GrantFiled: May 5, 1987Date of Patent: April 11, 1989Assignee: Santrade LimitedInventors: Udo K. R. Fischer, Erik T. Hartzell, Jan G. H. Akerman
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Patent number: 4764255Abstract: A tool or wear part comprises a cast iron or cast steel body carrying a plurality of cast-in inserts. Each insert comprises a cemented carbide cutting or wearing element partially embedded in the body, and an enclosure completely surrounding the embedded portion of the element. The enclosure is cast-in with respect to the body and has a higher melting point than the body. The enclosure is connected by a metallurgical bond to the body and by a shrink-fit to the element.Type: GrantFiled: March 13, 1987Date of Patent: August 16, 1988Assignee: Sandvik ABInventors: Udo K. R. Fischer, Erik T. Hartzell, Mats G. Waldenstrom
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Patent number: 4743515Abstract: The present invention relates to cemented carbide bodies preferably for rock drilling and mineral cutting. By having the bodies comprising a core of cemented carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase and having a low content of cobalt in the surface and a higher content of cobalt next to the eta-phase zone the bodies have obtained an increased strength and life in practical use.Type: GrantFiled: October 25, 1985Date of Patent: May 10, 1988Assignee: Santrade LimitedInventors: Udo K. R. Fischer, Erik T. Hartzell, Jan G. H. Akerman
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Patent number: 4576875Abstract: A wear part with high wear and abrasion resistance combined with unlimited weldability and good mechanical strength or toughness, comprising a composite part of hard metal portion, a cast metal alloy body portion and attached thereto to joining portion, characterized in that the joining portion consists essentially of a weldable steel which by casting is bonded to the cast metal alloy body portion to a combined mechanical-metallurgical bond is provided, as well as a method for forming such a wear part.Type: GrantFiled: June 17, 1981Date of Patent: March 18, 1986Assignee: Santrade Ltd.Inventors: Olle G. Olsson, Melih Yaman, Mats G. Waldenstrom, Udo K. R. Fischer