Patents by Inventor Narendra B. Dahotre
Narendra B. Dahotre 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: 10188519Abstract: An apparatus and method for laser-assisted machining (LAM) of bone without raising the temperature of the surrounding bone is discussed. The method of LAM of bone involves determining a target bone needing to be machined an then scanning a high power density laser beam along the bone at a machining rate that produces low-heat affected zones (HAZ) on the target bone. The process and apparatus is advantageous over conventional technologies because it provides a chemically clean, coherent, and monochromatic beam to the region to be machined.Type: GrantFiled: June 6, 2016Date of Patent: January 29, 2019Assignee: UNIVERSITY OF NORTH TEXASInventors: Narendra B Dahotre, Soundarapandia Santhanakrishnan
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Publication number: 20160278924Abstract: An apparatus and method for laser-assisted machining (LAM) of bone without raising the temperature of the surrounding bone is discussed. The method of LAM of bone involves determining a target bone needing to be machined an then scanning a high power density laser beam along the bone at a machining rate that produces low-heat affected zones (HAZ) on the target bone. The process and apparatus is advantageous over conventional technologies because it provides a chemically clean, coherent, and monochromatic beam to the region to be machined.Type: ApplicationFiled: June 6, 2016Publication date: September 29, 2016Inventors: Narendra B. Dahotre, Soundarapandia Santhanakrishnan
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Patent number: 9387041Abstract: An apparatus and method for laser-assisted machining (LAM) of bone without raising the temperature of the surrounding bone is discussed. The method of LAM of bone involves determining a target bone needing to be machined an then scanning a high power density laser beam along the bone at a machining rate that produces low-heat affected zones (HAZ) on the target bone. The process and apparatus is advantageous over conventional technologies because it provides a chemically clean, coherent, and monochromatic beam to the region to be machined.Type: GrantFiled: March 17, 2014Date of Patent: July 12, 2016Assignee: University of North TexasInventors: Narendra B. Dahotre, Soundarapandian Santhanakrishnan
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Publication number: 20140263214Abstract: An apparatus and method for laser-assisted machining (LAM) of bone without raising the temperature of the surrounding bone is discussed. The method of LAM of bone involves determining a target bone needing to be machined an then scanning a high power density laser beam along the bone at a machining rate that produces low-heat affected zones (HAZ) on the target bone. The process and apparatus is advantageous over conventional technologies because it provides a chemically clean, coherent, and monochromatic beam to the region to be machined.Type: ApplicationFiled: March 17, 2014Publication date: September 18, 2014Applicant: University of North TexasInventors: Narendra B. Dahotre, Soundarapandian Santhanakrishnan
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Publication number: 20110183292Abstract: An assembly configured for implantation in a living organism is provided. In some embodiments, the material includes a mechanical surface that has long range ordered micro-features. A repetitive pattern of hierarchical micro-features is incorporated in some embodiments, and in some embodiments the micro-features are composite in nature, and may include nano-structures. In one embodiment an assembly has a first article has a mechanical surface configured to be disposed in contact with a material that is not live biological tissue and a second article comprising a bio-interfacial surface configured to be disposed in contact with live biological tissue. Some embodiments include a screw or a post.Type: ApplicationFiled: March 30, 2011Publication date: July 28, 2011Inventors: Claus Daniel, Narendra B. Dahotre
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Publication number: 20090035723Abstract: A material configured for implantation in a living organism. In some embodiments, the material includes a mechanical surface that has long range ordered micro-features. A repetitive pattern of hierarchical micro-features is incorporated in some embodiments, and in some embodiments the micro-features are composite in nature, and may include nano-structures. One embodiment provides a method of modifying the surface of a tissue in a living organism. The method includes a step of dividing a laser beam into a plurality of laser beams and a further step of guiding the plurality of laser beams to create an interference pattern at the surface of the material, and a repetitive pattern of micro-features is formed on the surface of the tissue.Type: ApplicationFiled: August 3, 2007Publication date: February 5, 2009Inventors: Claus Daniel, Narendra B. Dahotre
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Patent number: 6497985Abstract: The present invention relates to a method for marking metallic alloys using laser alloying. Specifically, the present invention is directed toward the use of laser alloying steel or aluminum alloys with a mark that provides protection against wear and corrosion and greater permanency.Type: GrantFiled: June 9, 1999Date of Patent: December 24, 2002Assignee: University of Tennessee Research CorporationInventors: Mary Helen McCay, T. Dwayne McCay, John A. Hopkins, Narendra B. Dahotre, C. Michael Sharp, John Brice Bible, Frederick A. Schwartz
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Patent number: 6423162Abstract: This invention relates to a method of using a laser to produce a decorative appearance on the surface of a bumper. More specifically, the present invention relates to a laser alloying method to create a decorative alloyed layer on the surface of a bumper.Type: GrantFiled: July 2, 1999Date of Patent: July 23, 2002Assignee: The University of Tennesse Research CorporationInventors: Frederick A. Schwartz, Mary Helen McCay, T. Dwayne McCay, Narendra B. Dahotre, John Brice Bible, John A. Hopkins
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Patent number: 6350326Abstract: This invention is directed toward a method of calculating the total laser energy needed to produce one or more selected laser induced surface modification reactions in a substrate moving relative to a laser beam. The present invention is further directed to a method for programming a programmable feedback control system with the calculated total laser energy such that the control system may be used to control laser beam power level and beam width in a process for producing a laser induced surface modification.Type: GrantFiled: October 19, 1999Date of Patent: February 26, 2002Assignee: The University of Tennessee Research CorporationInventors: T. Dwayne McCay, Mary Helen McCay, Narendra B. Dahotre
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Patent number: 6328026Abstract: This invention is directed to a method for enhancing the wear resistance of an iron engine cylinder bore comprising laser alloying of the cylinder bore with selected precursors and honing the cylinder bore to a preselected dimension. The present invention is particularly well suited for enhancing the resistance to wear caused by the corrosion caused by automotive ethanol fuel. The present invention is also directed toward an improved automotive engine comprising alloyed cylinder bores with enhanced wear resistance characteristics.Type: GrantFiled: October 13, 1999Date of Patent: December 11, 2001Assignee: The University of Tennessee Research CorporationInventors: Yucong Wang, Barry J. Brandt, John Brice Bible, Narendra B. Dahotre, John A. Hopkins, Mary Helen McCay, Thurman Dwayne McCay, Fredrick A. Schwartz
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Publication number: 20010036587Abstract: The present invention relates to a method for marking metallic alloys using laser alloying. Specifically, the present invention is directed toward the use of laser alloying steel or aluminum alloys with a mark that provides protection against wear and corrosion and greater permanency.Type: ApplicationFiled: June 9, 1999Publication date: November 1, 2001Inventors: MARY HELEN MCCAY, T. DWAYNE MCCAY, JOHN A. HOPKINS, NARENDRA B. DAHOTRE, C. MICHAEL SHARP, JOHN BRICE BIBLE, FREDERICK A. SCHWARTZ
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Patent number: 6299707Abstract: This invention is directed toward a method for enhancing the wear resistance of an aluminum cylinder bore comprising laser alloying of the cylinder bore with selected precursors. The present invention is particularly well suited for enhancing the wear resistance caused by corrosion in an aluminum block engine comprising aluminum cylinder bores.Type: GrantFiled: May 24, 1999Date of Patent: October 9, 2001Assignee: The University of Tennessee Research CorporationInventors: Mary Helen McCay, T. Dwayne McCay, John A. Hopkins, Narendra B. Dahotre, Frederick A. Schwartz, John Brice Bible
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Patent number: 6294225Abstract: This invention relates to a method of improving the corrosion and wear resistance of a transport trailer surface. More specifically the present invention relates to a method of laser alloying the surface of a transport trailer to enhance the corrosion and wear resistant properties of the surface.Type: GrantFiled: May 10, 1999Date of Patent: September 25, 2001Assignee: The University of Tennessee Research CorporationInventors: Mary Helen McCay, T. Dwayne McCay, John A. Hopkins, Narendra B. Dahotre, Frederick A. Schwartz, John Brice Bible
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Patent number: 6284067Abstract: This invention relates to a method of using a laser to produce alloyed bands or strips on the surface of a piston for an internal combustion engine. More specifically, the present invention relates to a laser alloying method to produce superior wear resistant properties for an aluminum internal combustion engine piston.Type: GrantFiled: July 2, 1999Date of Patent: September 4, 2001Assignee: The University of Tennessee Research CorporationInventors: Frederick A. Schwartz, Mary Helen McCay, T. Dwayne McCay, Narendra B. Dahotre, John Brice Bible, John A. Hopkins
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Patent number: 6229111Abstract: The present invention is directed toward a method for plasma assisted laser surface alloying. Specifically, the present invention is directed toward a method for surface alloying using a laser beam having a rectangular cross sectional area and a plasma arc, in order to produce an alloyed substrate on the surface of the material.Type: GrantFiled: October 13, 1999Date of Patent: May 8, 2001Assignee: The University of Tennessee Research CorporationInventors: Mary Helen McCay, T. Dwayne McCay, John A. Hopkins, Narendra B. Dahotre, C. Michael Sharp, Frederick A. Schwartz, John Brice Bible
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Patent number: 6223137Abstract: The present invention relates to a method for marking, tracking, and managing hospital instruments. Specifically, the present invention relates to a method for marking instruments with information indicative of the manufacturer, part number, and serial number of each instrument, inputting such information into a database, inputting information into the database regarding the desired maintenance schedule for each instrument, inputting information into the database regarding the usage of each instrument, and tracking the usage and/or maintenance of each instrument by using the information in the database. The method also includes asset management, instrumentation identification and counting, and assembly of surgical trays and kits.Type: GrantFiled: March 25, 1999Date of Patent: April 24, 2001Assignee: The University of Tennessee Research CorporationInventors: Mary Helen McCay, T. Dwayne McCay, John A. Hopkins, John Brice Bible, Frederick A. Schwartz, Narendra B. Dahotre, C. Michael Sharp
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Patent number: 6173886Abstract: The present invention relates to an improved method for joining metals or alloys together. Specifically, the present invention relates to a method comprising the laser alloying of a first metal/alloy piece so that it can be joined with a second metal/alloy piece of a nonidentical composition.Type: GrantFiled: May 24, 1999Date of Patent: January 16, 2001Assignee: The University of Tennessee Research CorportionInventors: Mary Helen McCay, T. Dwayne McCay, Narendra B. Dahotre, John A. Hopkins, Frederick A. Schwartz, John Brice Bible
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Patent number: 6016227Abstract: This invention relates to an improved laser beam useful in material surface processing and an apparatus for producing the improved laser beam. The improved laser beam of the present invention comprises a power distribution that is more intense at the outer regions than in the central region. The invention includes an apparatus comprising a power spherical and cylindrical optical elements aligned to focus and/or shape a laser beam into a novel profile useful in material surface processing. The invention further includes a method of using this apparatus to focus and/or shape a laser beam for producing Laser Induced Surface Improvements, hereinafter referred to as "LISI".Type: GrantFiled: July 31, 1998Date of Patent: January 18, 2000Assignee: The University of Tennessee Research CorporationInventors: John A. Hopkins, Frederick A. Schwartz, Mary Helen McCay, Thurman Dwayne McCay, Narendra B. Dahotre, John Brice Bible
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Patent number: 5985056Abstract: The present invention is directed toward a process for laser alloying of a workpiece and an apparatus for carrying out said process. The method embodiment of the present invention is directed toward a process for forming an alloy in the surface of a metal substrate comprising the steps of applying an alloy precursor material at a controlled rate to the surface of the substrate and then melting the surface and the precursor alloy material by the application of a laser beam in order to form an alloy of the precursor alloy material and the substrate. The method embodiment of the present invention further comprises the steps of measuring one or more parameters indicative of alloying depth, controlling the rate of precursor application in response to at least one of the measured parameters, and allowing the allow to solidify.Type: GrantFiled: September 17, 1997Date of Patent: November 16, 1999Assignee: The University of Tennessee Research CorporationInventors: Thurman Dwayne McCay, Mary Helen McCay, Narendra B. Dahotre
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Patent number: 5961861Abstract: A feedback control system for performing and controlling the laser alloying of a workpiece. The apparatus includes a laser beam delivery system, a movement system capable of causing relative movement between a laser beam and a workpiece being irradiated by the laser beam, a precursor application system capable of applying a precursor at a desired rate to the surface of a moving workpiece, and a control system capable of receiving input signals indicative of one or more measured process parameters, processing those signals, and transmitting a control signal capable of controlling the laser beam delivery system, movement system, and/or precursor application system. Other embodiments of the invention utilize a variety of process parameter measuring devices in conjunction with the control system. These devices include, but are not limited to, temperature transducers, infrared detectors, and emission spectra measuring devices.Type: GrantFiled: September 17, 1997Date of Patent: October 5, 1999Assignee: The University of Tennessee Research CorporationInventors: Thurman Dwayne McCay, Mary Helen McCay, Narendra B. Dahotre