US Patent 7302985 Lowerable blind for irregularly-shaped windows

A window covering for an irregularly-shaped window includes a panel, comprising accordion folds, configured to fold up at a base of the window, and to raise and unfold to a substantially planar configuration. A top edge of the panel is shaped to match a top shape of the window; and a pull cord is attached to the top edge, configured to raise and lower the panel. The window covering can also include an alignment device, extending between the base of the window and the top edge of the window, and a plurality of connectors, attached to alternating opposing folds of the accordion folds at a vertex thereof, and slidingly disposed along the alignment device, to retain a vertical alignment of the panel during raising and lowering.