Combination sash lock and tilt latch and slidable window vent stop

A window fastener, for use with a sash window configured to slide and tilt with respect to a master window frame, said window fastener comprising:

• a sash lock comprising a lock housing, a cam, and an arm;
• said cam mounted to said lock housing to pivot between a locked position where said cam engages a keeper to lock the sash window in a closed window position to inhibit sliding window movement, a first unlocked position, and a second unlocked position;
• a tilt latch assembly comprising a latch housing, a latch member slidable within said latch housing and interconnected with said arm, and a latch spring configured to bias a tongue portion of said latch member to normally protrude out from said latch housing to prevent the sash window from being tilted;
• wherein said cam drives said arm to position said latch member at a first retracted latch position when said cam is at said first unlocked position;
• and wherein said cam drives said arm to position said latch member at a second retracted latch position when said cam is at said second unlocked position;
• a stop assembly configured to be mounted to the master window frame, said stop assembly comprising:
• a stop housing with an engagement surface configured to protrude a first distance away from the master window frame;
• a stop member slidably mounted to a portion of said stop housing to be slidable between a first stop member position and a second stop member position;
• said stop member comprising a stop surface configured to protrude a second distance away from the master window frame, said second distance being greater than said first distance;
• and
• a stop spring positioned to bias said stop member from said second stop member position toward said first stop member position;
• wherein said engagement surface is engaged by said tongue portion to redundantly lock the sash window in the closed window position, when said cam is in said locked position;
• wherein said stop surface is engaged by said tongue portion to restrict travel of the sash window to a limited open position, when said cam is in said first unlocked position;
• and
• wherein said tongue portion is disengaged from said stop surface to permit unrestricted travel of the sash window when said cam is in said second unlocked position.