Patent ID: 6863112

Claim:
A storm window adapted for fitting within the interior of an existing window frame, the storm window comprising: at least four rails of uniform cross-section, each rail having a uniform width and height with a length determined by the dimensions of the existing window frame, with each end of each rail terminating at a right angle, with an engaging cavity having a defined shape and dimension within the interior along the length of each rail and with at least one groove with a defined shape and dimension along at least one width of each rail; at least four corner brackets, each corner bracket having a first face and second face for contacting rails, said first and second faces disposed at right angles, with the first and second faces further having a joining member extending from each first and second face at a right angle, each joining member shaped and dimensioned to be substantially the same as that of the engaging cavity of the rails so as to be snugly but slidably insertable therein; a flexible plastic film; and, at least four retainers of uniform cross-section, each retainer have a length determined by the dimensions of the existing window frame, with each retainer having a groove attachment member shaped and dimensioned for engaging with the at least one groove of a rail, and a resilient spline adapted for compressibly engaging the existing window frame; whereby the ends of each rail are joined to a corner bracket by the joining members so as to form a rectangular shape, the flexible plastic film is positioned on one side of the rectangular shape and is secured by engagement between groove attachment members of the retainers and grooves of the rails, and the resulting rectangular shape with flexible plastic film secured thereto is adapted to be secured within the existing window frame by compressible engagement of the resilient spines of the retainers.