US Patent 11180942 Removable window vent stop

A window vent stop is disclosed having a housing with a peripheral flange defining an opening, and a body depending from the peripheral flange. A stop block is mounted within the body of the housing for movement between an open position wherein a portion of the stop block protrudes above the peripheral flange and a closed position. A spring leg is located on a bottom end of the housing and flexes toward the housing when under compression, providing compressive force along a line parallel to a longitudinal axis of the housing when the window vent stop is inserted into an opening in a window sash. By applying force to further compress the spring leg, the vent stop can be readily removed from the window sash without damage.