Window sashes, door leaves, or like elements for closing wall or like

Official title: Window sashes, door leaves, or like elements for closing {wall or like} openings; Layout of fixed or moving closures, e.g. windows {in wall or like openings}; Features of rigidly-mounted outer frames relating to the mounting of wing frames (E06B5/00 takes precedence; shutters or the like E06B9/00; glass panes C03)

E06B3/00 (Window sashes, door leaves, or like elements for closing wall or like) appears on 8,788 US grants and 7,671 published applications in this corpus.