Patents by Inventor David H. Stewart

David H. Stewart 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).

  • Patent number: 11932802
    Abstract: Various shaped abrasive particles are disclosed. Each shaped abrasive particle includes a body having at least one major surface and a side surface extending from the major surface.
    Type: Grant
    Filed: December 2, 2022
    Date of Patent: March 19, 2024
    Assignee: SAINT-GOBAIN CERAMICS & PLASTICS, INC.
    Inventors: Todd M. Cotter, Francois Wagner, Rene G. Demers, Richard J. Klok, Alexandra Marazano, Adam D. Lior, James A. Salvatore, Sujatha K. Iyengar, David F Louapre, Sidath S. Wijesooriya, Ronald Christopher Motta, Gary A. Guertin, Michael D. Kavanaugh, Doruk O. Yener, Jennifer H. Czerepinski, Jun Jia, Frederic Josseaux, Ralph Bauer, Frank J. Csillag, Yang Zhong, James P. Stewart, Mark P. Dombrowski, Sandhya Jayaraman Rukmani, Amandine Martin, Stephen E. Fox, Nilanjan Sarangi, Dean S. Matsumoto
  • Publication number: 20240081994
    Abstract: A steerable delivery system is provided for delivering a replacement heart valve to a native heart valve location. The steerable delivery system includes an outer sheath assembly having a capsule along a distal end portion for retaining the replacement heart valve in a compressed configuration. The capsule is constructed to provide both compression resistance and flexibility. The capsule may be formed with an outer polymer layer, a metal middle layer located on a radially inner surface of the outer polymer layer, and an inner liner located on a radially inner surface of the metal middle layer. A fluoroelastomer layer is provided for bonding the inner liner to the metal middle layer. The metal middle layer is preferably a metal hypotube.
    Type: Application
    Filed: November 21, 2023
    Publication date: March 14, 2024
    Inventors: Alexander H. Cooper, David Robert Landon, Kevin M. Stewart, Garrett Dallas Johnson, Glen T. Rabito, Tarannum Ishaq Gutierrez, Hiroshi Okabe, Ramon Aguilar, JR., Jesse Robert Edwards, Taylor Jacob Scheinblum, Patrick Chow, Julio Cesar Sanchez, Hieu Minh Luong
  • Patent number: 7202028
    Abstract: A method of detecting two different target molecules through a single electrode is carried out by (a) providing a conductive oxidation-reduction reaction detection electrode; (b) contacting a sample suspected of containing a first and second target molecule to the electrode under conditions in which the first and second target molecules are deposited on the electrode, wherein the first target molecule comprises a first label and the second target molecule comprises a second label; (c) contacting to the electrode a first transition metal complex that oxidizes the first preselected label in a first oxidation-reduction reaction and a second transition metal complex that oxidizes the first and second labels in a second oxidation-reduction reaction, with the first and second oxidation-reduction reactions producing different detectable signals; (d) detecting the presence of the first target molecule by detecting the first oxidation-reduction reaction; and (e) detecting the presence of the second target molecule by
    Type: Grant
    Filed: September 9, 2002
    Date of Patent: April 10, 2007
    Assignee: The University of North Carolina at Chapel Hill
    Inventors: H. Holden Thorp, Ivana V. Yang, David H. Stewart, John W. Groelke, Veronika A. Szalai
  • Patent number: 7081219
    Abstract: A method for manufacturing a molded structure in a press that includes a first mold and a second mold is provided. The second mold has a plurality of pressure actuators, with each pressure actuator capable of independent operation. The method includes the steps of positioning a preform having a thickness in the first mold, placing a quantity of resin adjacent the preform so as to create a resin reservoir, and then selectively actuating one or more of the pressure actuators apply pressure to the resin reservoir to force at least a portion of the resin reservoir to infuse through the thickness of the preform. The method may also include curing the resin-infused preform, and then removing the cured resin-infused preform from the first mold.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: July 25, 2006
    Inventor: David H. Stewart
  • Publication number: 20040241738
    Abstract: A method of detecting binding interactions and target molecules, such as proteins, protein fragments, recombinant proteins, recombinant protein fragments, extracellular matrix proteins, ligands, carbohydrates, steroids, hormones, drugs, drug candidates, immunoglobulins and receptors of eukaryotic, prokaryotic or viral origin, by mediated electrochemistry using labels that react with transition metal mediator complexes in a detectable catalytic redox reaction. These labels are attached directly to binders, target molecules, surrogate target molecules, or to affinity ligands capable of binding to the target or to surrogate target molecules capable of competing with the target for binding to another binder. The labels can be naturally present (endogenous) in the binder, target or affinity ligand, or constructed by the covalent attachment of the label to the binder, target, affinity ligand or surrogate target (exogenous).
    Type: Application
    Filed: July 2, 2004
    Publication date: December 2, 2004
    Inventors: David H. Stewart, John W. Groelke, H. Holden Thorp, Allen E. Eckhardt
  • Publication number: 20040128016
    Abstract: A method for manufacturing a near net-shape mold from a weldable material, including creating a computer model of a mold portion (30,32), analytically sectioning the computer model of the mold portion into a plurality of mold zones (22), generating mold zone cutting paths for a cutting machine to follow, cutting the weldable material into plurality of mold zones, generating surface profile cutting paths for a cutting machine to follow, machining surface profiles into the mold zones, assembling the mold zones by placing the mold zones side-by-side, generating welding paths for an electron beam welding a machine to follow, and welding the mold zones together.
    Type: Application
    Filed: April 4, 2003
    Publication date: July 1, 2004
    Inventor: David H. Stewart
  • Publication number: 20030227107
    Abstract: A method for manufacturing a molded structure in a press that includes a first mold and a second mold is provided. The second mold has a plurality of pressure actuators, with each pressure actuator capable of independent operation. The method includes the steps of positioning a preform having a thickness in the first mold, placing a quantity of resin adjacent the preform so as to create a resin reservoir, and then selectively actuating one or more of the pressure actuators apply pressure to the resin reservoir to force at least a portion of the resin reservoir to infuse through the thickness of the preform. The method may also include curing the resin-infused preform, and then removing the cured resin-infused preform from the first mold.
    Type: Application
    Filed: March 17, 2003
    Publication date: December 11, 2003
    Inventor: David H. Stewart
  • Publication number: 20030152960
    Abstract: A method of detecting two different target molecules through a single electrode is carried out by (a) providing a conductive oxidation-reduction reaction detection electrode; (b) contacting a sample suspected of containing a first and second target molecule to the electrode under conditions in which the first and second target molecules are deposited on the electrode, wherein the first target molecule comprises a first label and the second target molecule comprises a second label; (c) contacting to the electrode a first transition metal complex that oxidizes the first preselected label in a first oxidation-reduction reaction and a second transition metal complex that oxidizes the first and second labels in a second oxidation-reduction reaction, with the first and second oxidation-reduction reactions producing different detectable signals; (d) detecting the presence of the first target molecule by detecting the first oxidation-reduction reaction; and(e) detecting the presence of the second target molecule by d
    Type: Application
    Filed: September 9, 2002
    Publication date: August 14, 2003
    Inventors: H. Holden Thorp, Ivana V. Yang, David H. Stewart, John W. Groelke, Veronika A. Szalai
  • Patent number: 6558590
    Abstract: A method for manufacturing a molded structure in a press that includes the steps of positioning a preform (24) having a thickness in the lower mold (20), placing a quantity of resin adjacent the preform (24) so as to create a resin reservoir, and then selectively actuating one or more of the pressure actuators (28) to apply pressure to the resin reservoir to force at least a portion of the resin reservoir to infuse through the thickness of the preform (24). After the step of positioning, a top cover (32) may be placed upon the preform (24). The step of selectively actuating one or more of the pressure actuators (28) attached to an upper platen (60), may include a computer for controlling the pressure actuators (28).
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: May 6, 2003
    Inventor: David H. Stewart
  • Publication number: 20020037530
    Abstract: A method of detecting binding interactions and target molecules, such as proteins, protein fragments, recombinant proteins, recombinant protein fragments, extracellular matrix proteins, ligands, carbohydrates, steroids, hormones, drugs, drug candidates, immunoglobulins and receptors of eukaryotic, prokaryotic or viral origin, by mediated electrochemistry using labels that react with transition metal mediator complexes in a detectable catalytic redox reaction. These labels are attached directly to binders, target molecules, surrogate target molecules, or to affinity ligands capable of binding to the target or to surrogate target molecules capable of competing with the target for binding to another binder. The labels can be naturally present (endogenous) in the binder, target or affinity ligand, or constructed by the covalent attachment of the label to the binder, target, affinity ligand or surrogate target (exogenous).
    Type: Application
    Filed: November 16, 2001
    Publication date: March 28, 2002
    Inventors: David H. Stewart, John W. Groelke, H. Holden Thorp, Allen E. Eckhardt
  • Patent number: 6346387
    Abstract: A method of detecting binding interactions and target molecules, such as proteins, protein fragments, recombinant proteins, recombinant protein fragments, extracellular matrix proteins, ligands, carbohydrates, steroids, hormones, drugs, drug candidates, immunoglobulins and receptors of eukaryotic, prokaryotic or viral origin, by mediated electrochemistry using labels that react with transition metal mediator complexes in a detectable catalytic redox reaction. These labels are attached directly to binders, target molecules, surrogate target molecules, or to affinity ligands capable of binding to the target or to surrogate target molecules capable of competing with the target for binding to another binder. The labels can be naturally present (endogenous) in the binder, target or affinity ligand, or constructed by the covalent attachment of the label to the binder, target, affinity ligand or surrogate target (exogenous).
    Type: Grant
    Filed: November 24, 2000
    Date of Patent: February 12, 2002
    Assignees: Xanthon, Inc., The University of North Carolina at Chapel Hill
    Inventors: David H. Stewart, John W. Groelke, H. Holden Thorp, Allen E. Eckhardt
  • Patent number: 5551082
    Abstract: An athletic garment designed to protect the wearer from injury during athletic activity such as in-line roller skating, skiing, volleyball, mountain biking, basketball, hockey, field hockey, ice skating or gymnastics. The invention uses strategically placed and rib-shaped gel, air or elastic foam padding to protect the wearer from the impact and abrasion of a fall caused by such activity.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: September 3, 1996
    Assignee: Crash Pads, Inc.
    Inventors: David H. Stewart, Sheila C. Lehner
  • Patent number: D348973
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: July 26, 1994
    Assignee: Crash Pads, Inc.
    Inventors: David H. Stewart, Sheila C. Lehner