A blank is provided adapted for forming into a file folder. The blank comprises a planar sheet having a first surface and a second surface. The sheet has a first cover portion joined to a second cover portion along a mutual cover hinge line. The sheet is adapted for folding about the cover hinge line...http://www.google.de/patents/US6299401?utm_source=gb-gplus-sharePatent US6299401 - Printable file folder
