Patents Assigned to EVANS CAPACITOR COMPANY
  • Patent number: 9472349
    Abstract: A sintered article in which a solid body is at least partially embedded includes an opening. The solid body extends across the opening so that the solid body can deform within the opening. The opening in the solid body prevents distortion of the sintered body from a planar configuration during sintering, even when the green body that is sintered is relatively thin.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: October 18, 2016
    Assignee: EVANS CAPACITOR COMPANY
    Inventor: David A. Evans
  • Publication number: 20140218843
    Abstract: A sintered article in which a solid body is at least partially embedded includes an opening. The solid body extends across the opening so that the solid body can deform within the opening. The opening in the solid body prevents distortion of the sintered body from a planar configuration during sintering, even when the green body that is sintered is relatively thin.
    Type: Application
    Filed: April 3, 2014
    Publication date: August 7, 2014
    Applicant: EVANS CAPACITOR COMPANY
    Inventor: David A. Evans
  • Patent number: 8741214
    Abstract: A method of making a sintered article in which a solid object is embedded includes forming a green body of compressed particles with the solid body is partially embedded. The green body includes an opening across which the solid body extends. The green body is sintered to form a sintered body and the opening permits deformation of the solid body in response to stress applied during the sintering process. A sintered article in which a solid body is at least partially embedded includes an opening. The solid body extends across the opening so that the solid body can deform within the opening. The opening in the solid body prevents distortion of the sintered body from a planar configuration during sintering, even when the green body is relatively thin.
    Type: Grant
    Filed: October 17, 2011
    Date of Patent: June 3, 2014
    Assignee: Evans Capacitor Company
    Inventor: David A. Evans
  • Publication number: 20130095299
    Abstract: A method of making a sintered article in which a solid object is embedded includes forming a green body of compressed particles with the solid body is partially embedded. The green body includes an opening across which the solid body extends. The green body is sintered to form a sintered body and the opening permits deformation of the solid body in response to stress applied during the sintering process. A sintered article in which a solid body is at least partially embedded includes an opening. The solid body extends across the opening so that the solid body can deform within the opening. The opening in the solid body prevents distortion of the sintered body from a planar configuration during sintering, even when the green body is relatively thin.
    Type: Application
    Filed: October 17, 2011
    Publication date: April 18, 2013
    Applicant: EVANS CAPACITOR COMPANY
    Inventor: David A. EVANS
  • Publication number: 20120127632
    Abstract: Capacitors employing liquid or gel electrolytes have their useful lifetime significantly extended by including, in the electrolyte, a binary mixture of transition metal ion species. Each species has at least two distinct oxidation states when dissolved in the electrolyte. The interaction of the mixture of ion species reduces the potential of the cathode and maintains the potential of the cathode below the hydrogen potential to prevent the reduction of hydrogen ions and the formation of hydrogen. The binary mixture of transition metal species reduces the cathode potential by oxidation of the transition metal species at the anode and reduction of the transition metal species at the cathode. Thus, the rate of decrease in capacitance, increase in equivalent series resistance, and swelling of the capacitor are suppressed. In addition, the ratio of capacitor aging to the quantity of charge passed by the capacitor is decreased by at least a factor of two as compared to previous known extended life capacitors.
    Type: Application
    Filed: November 19, 2010
    Publication date: May 24, 2012
    Applicant: EVANS CAPACITOR COMPANY
    Inventors: David A. Evans, Jeffrey N. Reardon, David I. Zawacki
  • Patent number: 6721170
    Abstract: A packaged hybrid capacitor according to the invention includes a metal cup having a bottom wall with a periphery and an upstanding sidewall at the periphery and surrounding the bottom wall; a first capacitor electrode located within the sidewall and on the bottom wall of the metal cup; an endless electrically insulating plastic sealing member having a base and an outer wall upstanding from the base, disposed within the metal cup, the outer wall having a shape and size fitting within the cup, adjacent the sidewall of the cup; a metal cover including a top wall and a peripheral skirt extending from and surrounding the top wall and inclined relative the top wall toward an inside surface of the metal cover; a second capacitor electrode on the inside surface of the top wall; a separator disposed between the first and second electrodes; and an electrolyte within the capacitor and in contact with the first and second capacitor electrodes, wherein the sidewall of the metal cup bears against the peripheral skirt, wit
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: April 13, 2004
    Assignee: Evans Capacitor Company, Inc.
    Inventors: David A. Evans, Thomas A. Murphy
  • Patent number: 6594140
    Abstract: A capacitor includes a cathode having a coating including an oxide of one of cobalt, molybdenum, and tungsten, a nitride of a metal selected from the group consisting of titanium, vanadium, zirconium, niobium, molybdenum, and tungsten, a carbide of a metal selected from the group consisting of vanadium, niobium, molybdenum, and tungsten, an intercalation carbon cathode, or an electrically conducting polymer selected from polyacetylene, polypyrrole, poly-p-phenylene, polythiophene, poly-3-phenylthiophene, and poly-3-(4-fluorophenyl)-thiophene, an anode including a metal selected from tantalum, aluminum, niobium, zirconium, and titanium, spaced from the coating, and an electrolyte in contact with the coating and the anode.
    Type: Grant
    Filed: January 12, 1998
    Date of Patent: July 15, 2003
    Assignee: Evans Capacitor Company Incorporated
    Inventors: David A. Evans, John R. Miller
  • Patent number: 6576524
    Abstract: A method of making a flat capacitor includes forming at least one recess on an inside surface of a metal foil blank, leaving a surrounding peripheral flange. A coating performing as an electrode of the capacitor is applied to the inside surface of the metal foil blank and an ion-permeable separator is placed on that inside surface of the metal foil blank. A substantially planar anode with a protruding lead is placed in the recess with the lead extending through a hole of the metal foil blank. Thereafter, the metal foil blank is folded along a line intersecting the hole so that the anode is sandwiched between parts of the separator and the separator is in contact with the coating on the inside surface of the metal foil blank. In the folding process, parts of the peripheral flange of the metal foil blank are brought into contact with each other and these parts are sealed to each other to form a hermetically sealed metal foil case of the capacitor.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: June 10, 2003
    Assignee: Evans Capacitor Company Incorporated
    Inventors: David A. Evans, Ross Blakeney
  • Patent number: 6094339
    Abstract: A capacitor including a substantially planar electrochemical cathode including a porous coating; a spirally wound anode having an edge, the edge being disposed opposite and generally parallel to the cathode, the anode being selected from the group including tantalum, aluminum, niobium, zirconium, and titanium; an electrically insulating separator interposed between the cathode and the anode; and an electrolyte disposed between and in contact with the cathode and the anode.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: July 25, 2000
    Assignee: Evans Capacitor Company Incorporated
    Inventor: David A. Evans
  • Patent number: 5786980
    Abstract: A packaged electrical component includes a tubular body having first and second ends and an opening at the first end for receiving an electrical component; an electrical component disposed within the tubular body; an end cap mounted on the first end of the tubular body, closing the opening; and a fluid-filled pressure-applying element disposed within the tubular body between the end cap and the electrical component, applying pressure to the electrical component within the tubular body. The fluid-filled pressure-applying element is preferably a variable volume container that contains a gas, a liquid, or a solid produced by curing of a liquid. A fluid is injected into the container after assembly of the package so that a uniform pressure is applied to the component compensating for thickness non-uniformities of the component. Assembly is simplified since the element is pressurized after assembly of the package rather than while the package is being manufactured.
    Type: Grant
    Filed: February 2, 1996
    Date of Patent: July 28, 1998
    Assignee: Evans Capacitor Company, Incorporated
    Inventor: David A. Evans
  • Patent number: 5754394
    Abstract: A capacitor includes a cathode having a coating including an oxide of one of cobalt, molybdenum, and tungsten, a nitride of a metal selected from the group consisting of titanium, vanadium, zirconium, niobium, molybdenum, and tungsten, a carbide of a metal selected from the group consisting of vanadium, niobium, molybdenum, and tungsten, an intercalation carbon cathode, or an electrically conducting polymer selected from polyacetylene, polypyrrole, poly-p-phenylene, polythiophene, poly-3-phenylthiophene, and poly-3-(4-fluorophenyl)-thiophene, an anode including a metal selected from tantalum, aluminum, niobium, zirconium, and titanium, spaced from the coating, and an electrolyte in contact with the coating and the anode.
    Type: Grant
    Filed: November 4, 1996
    Date of Patent: May 19, 1998
    Assignee: Evans Capacitor Company Incorporated
    Inventors: David A. Evans, John R. Miller
  • Patent number: 5737181
    Abstract: A capacitor including a cathode of a porous coating including an oxide of at least one metal selected from the group consisting of ruthenium, iridium, nickel, rhodium, platinum, palladium, and osmium disposed on each of two opposed electrically conducting plates; an anode disposed between and spaced from the porous coatings and the electrically conducting plates and including a metal selected from the group consisting of tantalum, aluminum, niobium, zirconium, and titanium; and an electrolyte disposed between and in contact with the porous coatings and the anode.
    Type: Grant
    Filed: April 22, 1996
    Date of Patent: April 7, 1998
    Assignee: Evans Capacitor Company, Incorporated
    Inventor: David A. Evans