Patents by Inventor Herbert W. Doty
Herbert W. Doty 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: 11473456Abstract: A cylinder head valve seat of an automobile vehicle includes a valve seat having a valve seat surface integrally joined to an engagement end. The engagement end includes multiple materials extending through a cross section of the engagement end. The multiple materials include: a first material having a first thermal conductivity; and a second material having a second thermal conductivity higher than the thermal conductivity of the first material, wherein the first material transitions into the second material.Type: GrantFiled: September 15, 2020Date of Patent: October 18, 2022Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Qigui Wang, Devin R. Hess, Jeffrey Harris, Herbert W. Doty, Dale A. Gerard
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Publication number: 20220170138Abstract: An aluminum alloy is disclosed that is suitable for casting and additive manufacturing processes. The aluminum alloy may be used in the casting and additive manufacturing of engine blocks and/or cylinder heads of modern internal combustion engines. The aluminum alloy exhibits improved ductility and fatigue properties suitable for elevated operating temperatures from about 250° C. to 350° C. The alloy includes about, by weight, 4-10% Copper (Cu), 0.1-1.0% Manganese (Mn), 0.2 to 5% Magnesium (Mg), 0.01-1.0% Cerium (Ce), 0.01-2% Nickel (Ni), 0.01-0.8% Chromium (Cr), 0.01-1.0% Zirconium (Zr); 0.01-1.0% Vanadium (V), 0.01-0.3% Cobalt (Co), 0.01-1.0% Titanium (Ti), 1-200 ppm Boron (B), 1-200 ppm Strontium (Sr), 0.5% max Iron (Fe), 0.1% max other trace elements, and balance of aluminum (Al).Type: ApplicationFiled: December 2, 2020Publication date: June 2, 2022Inventors: Qigui Wang, Dale A. Gerard, Devin R. Hess, Herbert W. Doty, Daniel J. Wilson
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Publication number: 20220082035Abstract: A cylinder head valve seat of an automobile vehicle includes a valve seat having a valve seat surface integrally joined to an engagement end. The engagement end includes multiple materials extending through a cross section of the engagement end. The multiple materials include: a first material having a first thermal conductivity; and a second material having a second thermal conductivity higher than the thermal conductivity of the first material, wherein the first material transitions into the second material.Type: ApplicationFiled: September 15, 2020Publication date: March 17, 2022Inventors: Qigui Wang, Devin R. Hess, Jeffrey Harris, Herbert W. Doty, Dale A. Gerard
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Patent number: 10604825Abstract: An Aluminum-Silicon casting alloy for use in high temperature service conditions. The alloy composition includes, by weight percentage, from about 5.00% to about 17.00% Silicon (Si), from about 0.00% to about 0.90% Iron (Fe), from about 0.00% to about 1.00% Manganese (Mn); from about 0.000% to about 0.018% Strontium (Sr), from about 0.00% to about 2.00% Copper (Cu), from about 0.00% to about 0.50% Magnesium (Mg), from about 0.00% to about 0.05% Zinc (Zn), from about 0.01% to about 0.10% Boron (B); and a balance of Aluminum (Al).Type: GrantFiled: May 12, 2016Date of Patent: March 31, 2020Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventor: Herbert W. Doty
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Publication number: 20180347011Abstract: A system for casting an aluminum alloy includes a first chamber for containing a first melt at a first temperature, a second chamber for containing second melt at a second temperature that is lower than the first temperature, a mixing chamber in communication with the first chamber and the second chamber for simultaneously receiving and mixing the first melt from the first chamber with the second melt from the second chamber, and a mold chamber in communication with the mixing chamber and for receiving the mixed melt.Type: ApplicationFiled: May 31, 2017Publication date: December 6, 2018Inventors: Herbert W. Doty, Devin R. Hess, Qigui Wang
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Publication number: 20180345362Abstract: A casting tool for a direct squeeze casting process that includes a cast mold tool with a contoured internal passage for better die thermal management. This enables the use of a grey cast iron mold material. A durable mold surface may also be formed through a nodular cast iron reaction with a Magnesium addition in either sand core or sand core coating.Type: ApplicationFiled: June 2, 2017Publication date: December 6, 2018Inventors: Richard Osborne, Qigui Wang, Herbert W. Doty
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Publication number: 20180056384Abstract: A casting system includes a first mold, a second mold, the first mold and the second mold being configured to receive molten metal, the first mold and the second mold exerting pressure on the molten metal to form a mechanical component as the molten metal cools, and a sensor that measures the pressure exerted on the molten metal to provide feedback information to regulate the pressure exerted on the molten metal.Type: ApplicationFiled: August 24, 2016Publication date: March 1, 2018Inventors: Richard J. Osborne, Herbert W. Doty, Frank Sant
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Patent number: 9834828Abstract: Aluminum alloy components having improved properties. In one form, the cast alloy component may include about 0.6 to about 14.5 wt % silicon, 0 to about 0.7 wt % iron, about 1.8 about 4.3 wt % copper, 0 to about 1.22 wt % manganese, about 0.2 to about 0.5 wt % magnesium, 0 to about 1.2 wt % zinc, 0 to about 3.25 wt % nickel, 0 to about 0.3 wt % chromium, 0 to about 0.5 wt % tin, about 0.0001 to about 0.4 wt % titanium, about 0.002 to about 0.07 wt % boron, about 0.001 to about 0.07 wt % zirconium, about 0.001 to about 0.14 wt % vanadium, 0 to about 0.67 wt % lanthanum, and the balance predominantly aluminum plus any remainders. Further, the weight ratio of Mn/Fe is between about 0.5 and about 3.5. Methods of making cast aluminum parts are also described.Type: GrantFiled: April 30, 2014Date of Patent: December 5, 2017Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventor: Herbert W. Doty
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Publication number: 20170327929Abstract: An Aluminum-Silicon casting alloy for use in high temperature service conditions. The alloy composition includes, by weight percentage, from about 5.00% to about 17.00% Silicon (Si), from about 0.00% to about 0.90% Iron (Fe), from about 0.00% to about 1.00% Manganese (Mn); from about 0.000% to about 0.018% Strontium (Sr), from about 0.00% to about 2.00% Copper (Cu), from about 0.00% to about 0.50% Magnesium (Mg), from about 0.00% to about 0.05% Zinc (Zn), from about 0.01% to about 0.10% Boron (B); and a balance of Aluminum (Al).Type: ApplicationFiled: May 12, 2016Publication date: November 16, 2017Inventor: HERBERT W. DOTY
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Publication number: 20150315688Abstract: Aluminum alloy components having improved properties. In one form, the cast alloy component may include about 0.6 to about 14.5 wt % silicon, 0 to about 0.7 wt % iron, about 1.8 to about 4.3 wt % copper, 0 to about 1.22 wt % manganese, about 0.2 to about 0.5 wt % magnesium, 0 to about 1.2 wt % zinc, 0 to about 3.25 wt % nickel, 0 to about 0.3 wt % chromium, 0 to about 0.5 wt % tin, about 0.0001 to about 0.4 wt % titanium, about 0.002 to about 0.07 wt % boron, about 0.001 to about 0.07 wt % zirconium, about 0.001 to about 0.14 wt % vanadium, 0 to about 0.67 wt % lanthanum, and the balance predominantly aluminum plus any remainders. Further, the weight ratio of Mn/Fe is between about 0.5 and about 3.5. Methods of making cast aluminum parts are also described.Type: ApplicationFiled: April 30, 2014Publication date: November 5, 2015Applicant: GM Global Technology Operations LLCInventor: Herbert W. Doty
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Publication number: 20150213164Abstract: A method of computationally determining material property changes for a cast aluminum alloy component. Accuracy of the determination is achieved by taking into consideration material property changes over the projected service life of the component. In one form, the method includes accepting time-dependent temperature data and using that data in conjunction with one or more constitutive relationships to quantify the impact of various temperature regimes or conditions on the properties of heat-treatable components and alloys. Finite element nodal analyses may be used as part of the method to map the calculated material properties on a nodal basis, while a viscoplastic model may be used to determine precipitation hardening and softening effects as a way to simulate the time and temperature dependencies of the material. The combined approach may be used to determine the material properties over the expected service life of a cast component made from such material.Type: ApplicationFiled: January 27, 2014Publication date: July 30, 2015Applicant: GM Global Technology Operations LLCInventors: Qigui Wang, Devin R. Hess, Michael J. Walker, Herbert W. Doty, Bowang Xiao
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Patent number: 8980021Abstract: An aluminum alloy and a method of casting. At least one of zirconium, scandium, a nucleating agent selected from the group consisting of metal carbides, aluminides and borides, and rare earth elements are added to the alloy while in the molten state such that upon solidification, the cast alloy exhibits improved hot tear resistance. In a particular form, the nucleating agent may be titanium diboride for grain refining. Other agents that can be used for grain refining include scandium, zirconium, silicon, silver and one or more rare earth elements. In the case of rare earth elements, mischmetal may be used as a precursor. Combinations of titanium diboride and at least one other agent are especially effective in reducing the incidence of hot tearing in products cast from the modified aluminum alloy.Type: GrantFiled: April 2, 2008Date of Patent: March 17, 2015Assignee: GM Global Technology Operations LLCInventors: Herbert W. Doty, Fawzy H Samuel, Ahmed M Nabawy
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Patent number: 8728258Abstract: Aluminum castings having increased elongation and tensile strength are obtained by sequential aging a solutionized casting followed by rapid heating to nucleation temperature followed by rapid cooling, then reheating to precipitate growth temperature.Type: GrantFiled: June 10, 2008Date of Patent: May 20, 2014Assignee: GM Global Technology Operations LLCInventor: Herbert W. Doty
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Publication number: 20120227699Abstract: A linerless engine includes a casting defining a bore having an inner surface and a central longitudinal axis. The casting is formed from a castable aluminum-silicon alloy including silicon particles present a range of from about 11 to about 12.5 parts by weight. The inner surface has a surface variation defined by at least some of the silicon particles protruding toward the axis for from about 0.6 to about 1.5 microns. The linerless engine includes a piston slideably disposed within the bore and configured for translating along the axis, wherein the piston is formed from an aluminum alloy and includes a body having a skirt portion coated with a first coating, and at least one ring encircling and in contact with the body. The ring is coated with a diamond-like coating that is free from degradation when in contact with the at least some of the silicon particles.Type: ApplicationFiled: March 8, 2011Publication date: September 13, 2012Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Thomas A. Perry, Michael J. Walker, Bob R. Powell, JR., Anil K. Sachdev, Herbert W. Doty, Michael J. Lukitsch
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Patent number: 8168015Abstract: A heat treatment method for the direct quench of aluminum alloy castings is presented. An aluminum alloy casting can be heated to the solutionizing temperature. The temperature can be maintained for a period of time sufficient to dissolve the hardening elements into the aluminum solid solution and affect any morphological changes to non-soluble phases, such as speriodization of the eutectic silicon phase. After solutionizing, the aluminum alloy casting can be quenched. The aluminum alloy casting can be rapidly cooled from the solutionizing temperature directly to the aging temperature, eliminating the room temperature hold of a conventional process. Thereby, the process can reduce process steps and equipment, can improve throughput, and can eliminate some waste heat. Further, the process can reduce residual stress and can provide a potential to form new precipitates. Direct quench can also be used with the sequential aging of aluminum casting alloys.Type: GrantFiled: October 23, 2008Date of Patent: May 1, 2012Assignee: GM Global Technology Operations LLCInventor: Herbert W. Doty
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Publication number: 20100101691Abstract: A heat treatment method for the direct quench of aluminum alloy castings is presented. An aluminum alloy casting can be heated to the solutionizing temperature. The temperature can be maintained for a period of time sufficient to dissolve the hardening elements into the aluminum solid solution and affect any morphological changes to non-soluble phases, such as speriodization of the eutectic silicon phase. After solutionizing, the aluminum alloy casting can be quenched. The aluminum alloy casting can be rapidly cooled from the solutionizing temperature directly to the aging temperature, eliminating the room temperature hold of a conventional process. Thereby, the process can reduce process steps and equipment, can improve throughput, and can eliminate some waste heat. Further, the process can reduce residual stress and can provide a potential to form new precipitates. Direct quench can also be used with the sequential aging of aluminum casting alloys.Type: ApplicationFiled: October 23, 2008Publication date: April 29, 2010Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventor: HERBERT W. DOTY
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Publication number: 20090301617Abstract: Aluminum castings having increased elongation and tensile strength are obtained by sequential aging a solutionized casting followed by rapid heating to nucleation temperature followed by rapid cooling, then reheating to precipitate growth temperature.Type: ApplicationFiled: June 10, 2008Publication date: December 10, 2009Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventor: HERBERT W. DOTY
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Publication number: 20090252643Abstract: An aluminum alloy and a method of casting. At least one of zirconium, scandium, a nucleating agent selected from the group consisting of metal carbides, aluminides and borides, and rare earth elements are added to the alloy while in the molten state such that upon solidification, the cast alloy exhibits improved hot tear resistance. In a particular form, the nucleating agent may be titanium diboride for grain refining. Other agents that can be used for grain refining include scandium, zirconium, silicon, silver and one or more rare earth elements. In the case of rare earth elements, mischmetal may be used as a precursor. Combinations of titanium diboride and at least one other agent are especially effective in reducing the incidence of hot tearing in products cast from the modified aluminum alloy.Type: ApplicationFiled: April 2, 2008Publication date: October 8, 2009Inventors: Herbert W. Doty, Fawzy H. Samuel, Ahmed M. Nabawy
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Publication number: 20080060723Abstract: A castable aluminum alloy includes, in weight %, about 0.4% to about 2.5% Si, up to about 5% Cu, up to about 1% Mg, up to about 1% Fe, up to about 2% Mn, up to about 0.3% Ti, up to about 2.5% Ni, up to about 3% Zn, and the balance aluminum and provides reduced casting porosity and improved tensile strength and ductility in the cast and the heat treated condition.Type: ApplicationFiled: September 11, 2006Publication date: March 13, 2008Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventor: Herbert W. Doty
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Patent number: 7025115Abstract: A method and apparatus for the quiescent-fill dip of a foundry ladle and the transportation of molten material from a crucible to a mold through a foundry pour basin. Advantages from this process include, among others, a design which minimizes or eliminates turbulence in the molten material, especially in regard to the folding of one stream of molten material into another, as a means to provide undamaged metal to casting molds.Type: GrantFiled: August 11, 2004Date of Patent: April 11, 2006Assignee: General Motors CorporationInventor: Herbert W. Doty