Patents by Inventor Joan A. Cramm

Joan A. Cramm 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).

  • Increased strength polymer-blended membranes
    Patent number: 4609468
    Abstract: Polymer blend membranes which possess increased structural strength may be fabricated by preparing a polymer blend membrane comprising a mixture of a phosphoric acid or sulfuric acid and an organic polymer which is at least partially compatible therewith dissolved in a mutually miscible solvent. The resulting polymer blend membrane is then cast upon a porous solid support such as a glass cloth, polysulfone or ceramic and the solvent is allowed to evaporate.
    Type: Grant
    Filed: June 1, 1984
    Date of Patent: September 2, 1986
    Assignee: UOP Inc.
    Inventor: Joan A. Cramm