Patents by Inventor Charles W. Acker

Charles W. Acker 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).

  • Button with grommet
    Patent number: 4777704
    Abstract: Snap fastener uses a grommet attached to a first layer of fabric and defining a passage. A unitary button and shank as designed to have the shank attach to the grommet with a snap action and on its free end to attach to a second layer of fabric.
    Type: Grant
    Filed: December 9, 1986
    Date of Patent: October 18, 1988
    Inventor: Charles W. Acker
  • Device for assisting the marking of tests
    Patent number: 4167069
    Abstract: A mask with apertures is provided for use with a question or problem sheet having questions or problems in defined areas of the sheet, and answers outside such area. The mask is designed to hold such sheet in registration, revealing the defined areas and occluding the areas with the answers.
    Type: Grant
    Filed: September 12, 1977
    Date of Patent: September 11, 1979
    Inventor: Charles W. Acker