Patents by Inventor Richard A. Hjulstrom

Richard A. Hjulstrom 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).

  • Adjustment of thin film capacitors
    Patent number: 5004658
    Abstract: A system and method for adjusting the capacitance value of thin film capacitors during fabrication is provided. During formation of metal film capacitor plates on capacitor regions of a substrate, adjustment patterns comprised of multiple parallel adjustment lines corresponding to adjustment percentages of the capacitance value are formed in an area of the substrate adjacent to the capacitor regions. Selected adjustment lines of the adjustment patterns are offset aligned with corresponding lines of a photolithographic mask used during formation of the metal film capacitor plates in a re-etching process to selectively reduce the area of the capacitor plates to produce the desired decrease in capacitance value.
    Type: Grant
    Filed: June 12, 1989
    Date of Patent: April 2, 1991
    Assignee: Electro-Films, Inc.
    Inventor: Richard A. Hjulstrom
  • Adjustment of thin film capacitors
    Patent number: 4894316
    Abstract: A system and method for adjusting the capacitance value of thin film capacitors during fabrication is provided. During formation of metal film capacitor plates on capacitor regions of a substrate, adjustment patterns comprised of multiple parallel adjustment lines corresponding to adjustment percentages of the capacitance value are formed in an area of the substrate adjacent to the capacitor regions. Selected adjustment lines of the adjustment patterns are offset aligned with corresponding lines of a photolithographic mask used during formation of the metal film capacitor plates in a re-etching process to selectively reduce the area of the capacitor plates to produce the desired decrease in capacitance value.
    Type: Grant
    Filed: June 22, 1988
    Date of Patent: January 16, 1990
    Assignee: Electro-Films, Inc.
    Inventor: Richard A. Hjulstrom