Patents by Inventor E. James Fresia

E. James Fresia 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).

  • High temperature aluminum electrolytic capacitor
    Patent number: 4823236
    Abstract: A capacitor having a wound aluminum foil electrolytic capacitor section contains an electrolyte solution of 10 to 32 wt % diethylammonium fumarate, 10 to 30 wt % N-methylpyrrolidinone, 4 to 7 wt % water, 0.1 to 0.5 wt % ammonium dihydrogen phosphate, with the remainder ethylene glycol. The capacitor is capable of operation at temperatures up to 125.degree. C.
    Type: Grant
    Filed: May 23, 1988
    Date of Patent: April 18, 1989
    Assignee: Sprague Electric Company
    Inventor: E. James Fresia
  • Solid tantalum capacitor process
    Patent number: 4781802
    Abstract: Anodization of a tantalum pellet in a phosphate/glycol electrolyte is interrupted in order to heat the pellet without bias to a high temperature, then the anodization is completed, then a semiconductor is deposited in the pellet, and then the pellet is heated under bias less than employed during the anodization.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: November 1, 1988
    Assignee: Sprague Electric Company
    Inventor: E. James Fresia
  • Method of forming a solid tantalum capacitor
    Patent number: 4706375
    Abstract: The dielectric stability of a hermetically-sealed solid-electrolyte tantalum capacitor during high temperature storage is improved by the introduction of a small controlled amount of water into the capacitor container before the final sealing step in the manufacture of the capacitor.
    Type: Grant
    Filed: August 15, 1986
    Date of Patent: November 17, 1987
    Assignee: Sprague Electric Company
    Inventors: Walter J. Bernard, E. James Fresia
  • Electrolytic capacitor
    Patent number: 4535389
    Abstract: An electrolytic capacitor having a wound foil capacitor section, preferably aluminum foil, contains as electrolyte a solution of 3 to 10 wt % ammonium benzoate, 4 to 16 wt % water, and 75 to 93 wt % ethylene glycol which has a resistivity of 385 to 620 ohm-cm and provides a capacitor capable of operating above 100 V and above 85.degree. C. A nitro compound and a phosphate may also be present. The electrolyte is particularly suited for operation above 200 V and 95.degree. C. and higher.
    Type: Grant
    Filed: September 21, 1984
    Date of Patent: August 13, 1985
    Assignee: Sprague Electric Company
    Inventors: Gary J. Buczkowski, E. James Fresia
  • Aluminum electrolytic capacitor
    Patent number: 4476517
    Abstract: An aluminum electrolytic capacitor contains a low-resistivity electrolyte consisting essentially of 6 wt % diammonium adipate, 3 wt % ammonium formate, 16 wt % water, 0.025 to 0.3 wt % ammonium dihydrogen phosphate, 1 to 10 wt % p-nitrobenzoic acid, and the balance, ethylene glycol.
    Type: Grant
    Filed: October 7, 1983
    Date of Patent: October 9, 1984
    Assignee: Sprague Electric Company
    Inventor: E. James Fresia