Patents by Inventor Dennis L. Hammond
Dennis L. Hammond 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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Publication number: 20190291181Abstract: Metal powder compositions for pressed powder metallurgy, and methods of forming metal parts using the metal powder compositions. The metal powder compositions include a metal powder and a lubricant system, which are pressed to form a green compact. When the green compact is heated during a delubing process, the lubricant system provides a reactive carbon coating on the surface of the metal powder, which upon subsequent sintering, reacts with metal oxides present on the surface of the metal powder to form gas that is easily removed from the system. Removing the metal oxides from the surface of the metal powder provides a more dense metal part, and allows for sintering of the green compact without the need for hydrogen gas, which would otherwise be needed to remove the metal oxides on the surface of the metal powder.Type: ApplicationFiled: December 4, 2017Publication date: September 26, 2019Inventor: Dennis L. HAMMOND
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Patent number: 9248500Abstract: A method for protecting powder metallurgy alloy elements from oxidation and/or hydrolyzation during sintering. The method includes (1) coating the admixed alloy elements in an inert (e.g., nitrogen) atmosphere with a hydrophobic lubricant that is capable of becoming mobile during pressing, the amount of lubricant being at least 45% of the total volume of all components to be added to the base metal powder; (2) mixing the lubricant-coated admixed alloy elements with the base metal powder to form a mixture; (3) pressing the mixture to form a pre-sintered part having a green density that is from about 95% to about 98% of a calculated pore-free density; and (4) sintering the part.Type: GrantFiled: August 4, 2009Date of Patent: February 2, 2016Assignee: APEX ADVANCED TECHNOLOGIES, LLCInventors: Dennis L. Hammond, Richard Phillips
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Patent number: 8062582Abstract: The present invention provides metal powder compositions for pressed powder metallurgy and methods of forming metal parts using the metal powder compositions. In each embodiment of the invention, the outer surface of primary metal particles in the metal powder composition is chemically cleaned to remove oxides in situ, which provides ideal conditions for achieving near full density metal parts when the metal powder compositions are sintered.Type: GrantFiled: October 2, 2006Date of Patent: November 22, 2011Assignee: Apex Advanced Technologies, LLCInventors: Dennis L. Hammond, Richard Phillips
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Patent number: 7892314Abstract: The present invention provides powder metal compositions and methods of making and using the same. Powder metal compositions according to the invention include base metal particles, a lubricant that transforms from a solid phase material to a viscous, liquid phase material during pressing, and a micronized deformable solid material. The micronized deformable solid material fills at least a portion of the void space between the base metal particles during pressing, which allows at least a portion of the lubricant to migrate as a viscous liquid phase material to the interface between the surface of the green compact and the wall of the mold cavity to provide lubrication that reduces the ejection force necessary to remove the green compact from the mold cavity.Type: GrantFiled: August 26, 2005Date of Patent: February 22, 2011Assignee: Apex Advanced Technologies, LLCInventor: Dennis L Hammond
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Publication number: 20100028194Abstract: A method for protecting powder metallurgy alloy elements from oxidation and/or hydrolyzation during sintering. The method includes (1) coating the admixed alloy elements in an inert (e.g., nitrogen) atmosphere with a hydrophobic lubricant that is capable of becoming mobile during pressing, the amount of lubricant being at least 45% of the total volume of all components to be added to the base metal powder; (2) mixing the lubricant-coated admixed alloy elements with the base metal powder to form a mixture; (3) pressing the mixture to form a pre-sintered part having a green density that is from about 95% to about 98% of a calculated pore-free density; and (4) sintering the part.Type: ApplicationFiled: August 4, 2009Publication date: February 4, 2010Applicant: APEX ADVANCED TECHNOLOGIES, LLCInventors: Dennis L. Hammond, Richard Phillips
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Publication number: 20090162236Abstract: The present invention provides metal powder compositions for pressed powder metallurgy and methods of forming metal parts using the metal powder compositions. In each embodiment of the invention, the outer surface of primary metal particles in the metal powder composition is chemically cleaned to remove oxides in situ, which provides ideal conditions for achieving near full density metal parts when the metal powder compositions are sintered.Type: ApplicationFiled: October 2, 2006Publication date: June 25, 2009Applicant: APEX ADVANCED TECHNOLOGIES, LLCInventors: Dennis L. Hammond, Richard Phillips
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Publication number: 20090028742Abstract: The present invention provides powder metal compositions and methods of making and using the same. Powder metal compositions according to the invention are substantially dry and include a blend of base metal particles and a pressing aid. The pressing aid includes a micronized deformable solid material and a high melt point lubricating material, which have been pre-mixed or co-ground with each other. Powder metal compositions according to the present invention are particularly useful in applications where the pre-sintered density of the pressed metal part is less than or equal to about 6.9 g/cm3.Type: ApplicationFiled: July 26, 2007Publication date: January 29, 2009Applicant: APEX ADVANCED TECHNOLOGIES LLCInventor: Dennis L. Hammond
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Patent number: 7264646Abstract: The present invention provides a lubricant system in the pressing of powders to form a part. The lubricant system is a solid at ambient conditions. However, upon application of pressure during the pressing of the metal parts, the lubricant system forms a liquid phase along the walls of cavity in which the powder is being pressed. The lubricant system may also be used in connection with a polar powder thereby providing certain beneficial results.Type: GrantFiled: January 26, 2004Date of Patent: September 4, 2007Assignee: Apex Advanced Technologies, LLCInventor: Dennis L. Hammond
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Patent number: 7192464Abstract: The present invention provides a composition for use in pressed powder metallurgy. The composition includes a plurality of substantially dry, discrete agglomerates, a portion of which include a first metal particle adhered to a second metal particle by a binder that includes a polysaccharide. The composition can be used to form green compacts that exhibit excellent green strength and high density. The present invention also provides a process for the preparation of the composition, a method of forming a metal part using the composition and metal parts formed according to the method.Type: GrantFiled: September 1, 2004Date of Patent: March 20, 2007Assignee: Apex Advanced Technologies, LLCInventor: Dennis L. Hammond
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Patent number: 7183242Abstract: The present invention provides a lubricant system in the pressing of powders to form a part. The lubricant system is a solid at ambient conditions. However, upon application of pressure during the pressing of the metal parts, the lubricant system forms a liquid phase along the walls of cavity in which the powder is being pressed.Type: GrantFiled: November 24, 2003Date of Patent: February 27, 2007Assignee: Apex Advanced Technologies, LLCInventor: Dennis L. Hammond
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Patent number: 7026391Abstract: This invention relates to a polymer composition comprising (A) from about 55% to about 75% by weight of at least one polyolefin, (B) from about 2% to about 12% by weight of at least one reaction product of an alpha, beta unsaturated carboxylic reagent and a polyolefin, and (C) from 15% to about 35% by weight of filler. In one aspect, the polymer compositions also include (D) at least one copolymer of ethylene and an olefin, (E) at least one polyamide, or (F) a mixture of (D) and (E). These compositions provide articles and films with improved scratch resistance and hardness. These compositions have improved processing character because their low coefficient of friction.Type: GrantFiled: January 7, 2002Date of Patent: April 11, 2006Assignee: Ferro CorporationInventors: Anthony S. Scheibelhoffer, Deenadayalu Chundury, Gerald W. Drabeck, Timothy W. Birch, Dennis L. Hammond
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Publication number: 20040175286Abstract: The present invention provides a lubricant system in the pressing of powders to form a part. The lubricant system is a solid at ambient conditions. However, upon application of pressure during the pressing of the metal parts, the lubricant system forms a liquid phase along the walls of cavity in which the powder is being pressed. The lubricant system may also be used in connection with a polar powder thereby providing certain beneficial results.Type: ApplicationFiled: January 26, 2004Publication date: September 9, 2004Applicant: Apex Advanced Technologies, LLCInventor: Dennis L. Hammond
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Publication number: 20040077508Abstract: The present invention provides a lubricant system in the pressing of powders to form a part. The lubricant system is a solid at ambient conditions. However, upon application of pressure during the pressing of the metal parts, the lubricant system forms a liquid phase along the walls of cavity in which the powder is being pressed.Type: ApplicationFiled: November 24, 2003Publication date: April 22, 2004Applicant: Apex Advanced Technologies, LLCInventor: Dennis L. Hammond
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Patent number: 6679935Abstract: The present invention provides a lubricant system in the pressing of powders to form a part. The lubricant system is a solid at ambient conditions. However, upon application of pressure during the pressing of the metal parts, the lubricant system forms a liquid phase along the walls of cavity in which the powder is being pressed.Type: GrantFiled: August 12, 2002Date of Patent: January 20, 2004Assignee: Apex Advanced Technologies, LLCInventor: Dennis L. Hammond
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Publication number: 20030109388Abstract: The present invention provides a lubricant system in the pressing of powders to form a part. The lubricant system is a solid at ambient conditions. However, upon application of pressure during the pressing of the metal parts, the lubricant system forms a liquid phase along the walls of cavity in which the powder is being pressed.Type: ApplicationFiled: August 12, 2002Publication date: June 12, 2003Inventor: Dennis L. Hammond
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Publication number: 20030004245Abstract: This invention relates to a polymer composition comprising (A) from about 55% to about 75% by weight of at least one polyolefin, (B) from about 2% to about 12% by weight of at least one reaction product of an alpha, beta unsaturated carboxylic reagent and a polyolefin, and (C) from 15% to about 35% by weight of filler. In one aspect, the polymer compositions also include (D) at least one copolymer of ethylene and an olefin, (E) at least one polyamide, or (F) a mixture of (D) and (E). These compositions provide articles and films with improved scratch resistance and hardness. These compositions have improved processing character because their low coefficient of friction.Type: ApplicationFiled: January 7, 2002Publication date: January 2, 2003Inventors: Anthony S. Scheibelhoffer, Deenadayalu Chundury, Gerald W. Drabeck, Timothy W. Birch, Dennis L. Hammond
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Patent number: 5843524Abstract: The present invention provides a new and improved method of producing a dustless vinyl halide polymer color concentrate that does not require the formation of a hot melt or the use of wax. The color concentrate comprises a multitude of fine particles which each comprise a vinyl halide polymer resin core and a colorant material shell. The method includes the steps of providing a vinyl halide polymer, providing a colorant material, providing a compatibilizer having a solubility parameter of from about 7 to about 12 (cal/ml).sup.1/2, and mixing the vinyl halide polymer, compatibilizer and colorant material together to yield the dustless concentrate in the form of a vinyl halide resin core surrounded by a shell of the compatibilzer and the colorant material.Type: GrantFiled: February 7, 1997Date of Patent: December 1, 1998Assignee: Ferro CorporationInventors: Surachai Wimolkiatisak, Dennis L. Hammond, Anthony S. Scheibelhoffer, Allen W. Carlson, Mir L. Ali
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Patent number: 5670561Abstract: The present invention provides a color concentrate comprising (a) at least one resin selected from the group consisting of a polymer of a diene, a rosin material, a coumarone-indene resin, a polymer of vinyl aromatic monomer having an M n of from about 500 to about 4000, a wax and a mixture of two or more thereof, (b) at least one resin selected from the group consisting of a copolymer of an olefin and an acrylate or a methacrylate, a polymer of a vinyl aromatic monomer having an M n of at least about 10,000 and a mixture thereof, and (c) at least one colorant.Type: GrantFiled: June 13, 1996Date of Patent: September 23, 1997Assignee: Ferro CorporationInventors: Anthony S. Scheibelhoffer, Richard L. Abrams, Dianna B. Dusek, Dennis L. Hammond, Robert J. Opalko, Ronald E. Thompson
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Patent number: 5443768Abstract: This invention relates to an abrasive composition comprising (a) a major amount of at least one abrasive powder, (b) at least one resin selected from the group consisting of a polymer of a diene, a rosin material, a coumarone-indene resin, and a mixture of two or more thereof, and (c) at least one copolymer of an olefin and an acrylate or a methacrylate. The abrasive composition may additionally include (d) a surface active agent. The abrasive composition may be added to a polymer or resin to form purge compositions. The invention also relates to methods of cleaning processing equipment and preparing the abrasive compositions and purge composition.Type: GrantFiled: December 21, 1993Date of Patent: August 22, 1995Assignee: The Ferro CorporationInventors: Anthony S. Scheibelhoffer, Dianna B. Dusek, Dennis L. Hammond, Surachai Wimolkiatisak, William R. Myers, Robert J. Opalko, Richard L. Abrams
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Patent number: 4360143Abstract: An improved method is disclosed for manufacturing suspension members for use in a vehicle suspension system. The suspension member is formed and subjected to prestressing forces at least as great as the expected maximum forces to which the suspension members will be subjected during operation of the vehicle in which they are mounted.Type: GrantFiled: February 7, 1980Date of Patent: November 23, 1982Assignee: Dana CorporationInventors: John A. Beckman, Ronald A. Rinehart, Dennis L. Hammond