Patents by Inventor Judith A. Lefelar

Judith A. Lefelar 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).

  • Metals coated with protective coatings of annealed perfluorinated cation-exchange polymers and method for making same
    Patent number: 5069974
    Abstract: A passive metal is coated with a perfluorocarbon copolymer cation-exchange polymer and subsequently annealed. The annealed polymer coating acts as a barrier to anions which attack and breakdown the passivity mechanism of such passive metals, thereby protecting the passive metals against localized corrosion, such as crevice or piting corrosion, caused by anionic attack.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: December 3, 1991
    Assignee: Monsanto Company
    Inventors: David C. Silverman, Judith A. Lefelar, Patrick J. Kinlen