Patents by Inventor Cynthia A. Navar

Cynthia A. Navar 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).

  • Wet-etch process and composition
    Patent number: 5292445
    Abstract: A wet-etch composition for polyamic acids and partially cured polyamic acids comprising an aqueous solution having a major portion of water, a substituted hydrocarbon solvent and a non-ionic base that is strong enough to deprotonate the polyamic acid or a partially cured polyamic acid in a weight ratio of 0.1-49:49-0.1, with the proviso that the composition contains less than 1.0 percent ionic base. The present invention further provides a process for wet-etching polyamic acids or partially cured polyamic acids.
    Type: Grant
    Filed: July 16, 1992
    Date of Patent: March 8, 1994
    Assignee: Amoco Corporation
    Inventors: Douglas E. Fjare, Allyson J. Beuhler, Cynthia A. Navar
  • Wet-etch process and composition
    Patent number: 5183534
    Abstract: A wet-etch composition for polyamic acids and partially cured polyamic acids containing an aqueous solution having a major portion of water, a substituted hydrocarbon solvent and a non-ionic base that is strong enough to deprotonate the polyamic acid or a partially cured polyamic acid in a weight ratio of 0.1-49:49-0.1, with the proviso that the composition contains less than 1.0 percent ionic base. The present invention further provides a process for wet-etching polyamic acids or partially cured polyamic acids.
    Type: Grant
    Filed: October 30, 1990
    Date of Patent: February 2, 1993
    Assignee: Amoco Corporation
    Inventors: Douglas E. Fjare, Allyson J. Beuhler, Cynthia A. Navar