US Patent 7699365 Sash lock with condition signal

A sash lock for a sash window assembly where the sash window assembly includes an upper sash window and a lower sash window, each of the sash windows being mounted within opposed guide rails on a master frame wherein at least one of the sash windows is slidable within the frame relative to the other sash window. The sash lock has a housing for mounting on a stile of one of the sash windows and a keeper for mounting on a stile of a second sash of the window. The housing has a locking assembly comprising an actuator and a catch. The actuator is adapted to move the catch. The catch is adapted to engage and disengage a keeper as the actuator is moved from a first position to a second position. The movement of the catch from a first position to a second position causes an indicator in the housing to signal whether the locking assembly of the sash lock is in locking position.