Patents by Inventor David S. Applegate

David S. Applegate 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).

  • Publication number: 20020196099
    Abstract: A resonator is provided comprising a conductive element, and a closed-slot in the conductive element, where the length of the closed slot dictates the resonating properties of the resonator. The closed slot generally confines the electromagnetic field resonated by the resonator in a direction perpendicular to a plane of the resonator, providing greater flexibility in the placement of the closed-slot resonator within the filter housing. Further, where three-dimensional resonators are used, compact resonator configuration such as spiral resonator configurations may be securely mounted within the filter without incurring severe filter losses due to the mounting mechanism, allowing filters designed with closed-slot resonators to be more compact in size than filters designed with prior art three-dimensional resonator configurations.
    Type: Application
    Filed: June 26, 2001
    Publication date: December 26, 2002
    Inventors: Stephen K. Remillard, Piotr O. Radzikowski, Sean S. Cordone, David S. Applegate, J. David Kokales, Arun K. Mehrotra
  • Publication number: 20020165098
    Abstract: A method for providing a superconductive coating on three dimensional substrates by dip coating is disclosed. The dip coating formulation includes terpineol, butoxyethyl acetate, binder, dispersant, YBCO, and alcohol and has a viscosity ranging from 60 cPs to about 125 cPs. After the substrate is dipped in the dip coating formulation, it is dried, baked and then sintered. The formulation is prepared by dissolving the binder and the dispersant in the terpineol and butoxyethyl acetate solvents to create a vehicle. The YBCO is then milled with a vehicle to create a thick ink which is subsequently thinned with ethanol to produce a dip ink formulation having the aforenoted viscosity.
    Type: Application
    Filed: March 6, 2001
    Publication date: November 7, 2002
    Inventor: David S. Applegate
  • Patent number: 5805036
    Abstract: A magnetically-activated switch including a high temperature superconductor. The magnetic switch includes a high temperature superconductor coupled at both ends to a rigid beam, a thermal shield structure is disposed adjacent to the superconductor and a magnetic field source is positioned near the superconductor to allow transitioning of the superconductor in and out of the superconducting state.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: September 8, 1998
    Assignee: Illinois Superconductor
    Inventors: James D. Hodge, Qiang Huang, David S. Applegate
  • Patent number: 5761017
    Abstract: A high temperature superconductor fault current limiter and a method of using same. The fault current limiter comprises a high temperature superconductor material structure at least partially encapsulated in an epoxy having thermal conductivity properties that enable the superconductor to heat rapidly during a fault condition while preventing thermal runaway. The epoxy encapsulation decreases the critical current density of the superconductor material structure and increases the rate at which resistance increases with increasing current once the critical current density is exceeded. Preferably, the epoxy has thermal expansion properties approximately equal to the thermal expansion properties of the superconductor material structure.
    Type: Grant
    Filed: June 15, 1995
    Date of Patent: June 2, 1998
    Assignee: Illinois Superconductor Corporation
    Inventors: James D. Hodge, Lori J. Klemptner, David S. Applegate