Patents by Inventor Frederick Christian Schweitzer

Frederick Christian Schweitzer 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).

  • Pocket liner
    Patent number: 5941571
    Abstract: In an element for a book which includes a sheet having a slit configured for receiving an item through the sheet, the improvement includes the slit going to two folds of the sheet along fold lines that are transverse to the slit, the folds being at angles that are 90 degrees or less.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: August 24, 1999
    Assignee: Specialty Loose Leaf, Inc.
    Inventors: Robert B. Wilson, Frederick Christian Schweitzer