single monolithic surface that can also account for thermal expansion elements of the latching mechanism are arranged to allow the window or curtain wall to be assembled from the interior leaving only caulking to be performed from the exterior concealing all of such elements helps eliminate the exposure of window mullions and minimizes maintenance of the window or curtain wall application_number US 201515301901 A description the following is a detailed description of the invention provided to aid those skilled in the art in practicing the present invention those of ordinary skill in the art may make modifications and variations in the embodiments described herein without departing from the spirit or scope of the present invention unless otherwise defined all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs the terminology used in the description of the invention herein is for describing particular embodiments only and is not intended to be limiting of the invention all publications patent applications patents figures and other references mentioned herein are expressly incorporated by reference in their entirety it will be understood that when an element is referred to as being u201c coupled u201d or u201c connected u201d to another element it can be directly coupled or connected to the other element or intervening elements may also be present in contrast when an element is referred to as being u201c directly coupled u201d or u201c directly connected u201d to another element there are no intervening elements present like numbers refer.