Patents by Inventor Virginia L. Hammersmith

Virginia L. Hammersmith 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).

  • Method and apparatus for controlled removal of excess slurry from organic foam
    Patent number: 4263843
    Abstract: Method and apparatus for removing excess ceramic slurry from polyurethane foam used as a matrix for ceramic material in manufacturing filters for molten metals such as aluminum. The apparatus comprises a first chamber for retaining a body of polyurethane foam impregnated with a slurry of ceramic material; a second chamber; a slurry-permeable screen between the first and second chambers; and compression means for pressing the polyurethane foam against the screen. By evacuating the second chamber and simultaneously compressing the foam against the screen, slurry is withdrawn from the foam into the second chamber while retaining in the foam an evenly distributed residue of ceramic material.
    Type: Grant
    Filed: July 30, 1979
    Date of Patent: April 28, 1981
    Assignee: Aluminum Company of America
    Inventors: Virginia L. Hammersmith, Richard G. LaBar