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You are an expert at summarizing long articles. Proceed to summarize the following text: 
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to an interior window frame assembly, and more particularly to an aesthetically pleasing interior window frame assembly for anchoring an interior window shutter thereto.  
         [0003]     2. Background and Related Art  
         [0004]     Window coverings such as shades, blinds and shutters are commonly used to provide privacy in a room as well as to block or reduce incoming sunlight. Window shutters are particularly popular as they provide maximum privacy, versatility, durability and ease of use. Window shutters may be constructed from a variety of materials, although the most commonly used material is wood and/or composites, finished either with a traditional wood finish, paint or by a coating of plastic or other substance.  
         [0005]     Regardless of the material used to construct window shutters, window shutters are typically heavier and more cumbersome than other types of window coverings. Accordingly, proper installation and use of durable supporting frames and hardware are critical to ensure that shutters do not detach upon repeated use.  
         [0006]     Traditionally, wood or wood composite window frames have been implemented for this purpose. Although the type of wood used in frame construction may vary, wood frames are typically soft and bulky as they require a considerable amount of surface area to provide the degree of elasticity and strength needed to properly support the weight of an attached shutter. These characteristics make frame handling and installation difficult, and labor expensive.  
         [0007]     Wood frames are especially difficult to implement where there is a preexisting window molding or irregularities in the dimensions of a window opening. Those skilled in the art have traditionally dealt with this problem by trimming and/or caulking a window frame to accommodate such irregularities. This solution, however, is both time consuming and inexact. Indeed, if a window frame is improperly trimmed or installed out of square with the window opening, it may not be able to support the weight of an attached window covering. Wood frames are also prone to warp, thus further compromising the frame&#39;s strength and squareness with respect to a window.  
         [0008]     Further, a standard window frame that has become strained or deformed due to warping or improper positioning may fail to accommodate a standard size window covering. A window covering must then be customized to accommodate the proportions of the window frame. Alternatively, the window frame must be replaced, repositioned and/or re-secured as necessary to retain and support a standard window covering in square with the window opening.  
         [0009]     These inherent characteristics and difficulties of window frame and shutter installation require considerable time and labor of even highly skilled carpenters. When a layman attempts shutter installation, window frame and shutter installation can be dangerous as well. Improper window frame and shutter installation, or use of materials in window framing that are inadequate to support the weight of a shutter may cause the shutter to detach, thereby increasing a likelihood of damage to property and/or personal injury.  
         [0010]     Accordingly, what is needed is an aesthetically pleasing window frame assembly capable of easy installation by those with a minimum of carpentry knowledge. What is also needed is a lightweight, slim profile window frame assembly that may be easily implemented in connection with a preexisting window molding. Further what is needed is a window frame assembly that maintains squareness with a window over time. Finally what is needed is a window frame assembly that compensates for irregularities in the dimensions of the window opening such that the window frame may predictably and reliably accommodate a standard window covering.  
         [0011]     The present invention overcomes the foregoing and other disadvantages of the prior art by providing a novel and improved window frame assembly.  
       SUMMARY OF THE INVENTION  
       [0012]     The present invention is an aesthetically pleasing, slim profile window frame assembly that is capable of retaining a shutter. Specifically, the window frame assembly of the present invention comprises a core substrate coupled to a flange. Certain embodiments of the present invention comprise a core substrate having a thickness less than {fraction (5/16)} inch (7.9 mm) and having, by volume, an elastic modulus greater than wood. A flange comprises a depth sufficient to retain a hinge attached to a window covering, such as a shutter. Certain embodiments of the present invention provide for a decorative covering to be coupled to the core substrate and/or flange such that a portion of the window frame assembly is thereby concealed. A decorative covering may comprise wood, wood veneer, plastic, cloth and/or paint. The improved strength per volume of the present invention facilitates shutter installation by a “do-it-yourself” homeowner or handyman as well as by a skilled carpenter.  
         [0013]     An object of the present invention is to provide an aesthetically pleasing window frame assembly capable of easy installation by a person with a minimum of carpentry knowledge.  
         [0014]     Another object of the present invention is to provide a lightweight, slim profile window frame assembly that may be easily implemented in connection with a preexisting window molding.  
         [0015]     It is a further object of the present invention to provide a window frame assembly that maintains squareness with respect to a window opening upon installation and over time.  
         [0016]     A further object of the present invention is to provide a window frame assembly that compensates for irregularities in the dimensions of the window opening such that the window frame assembly may predictably and reliably accommodate a standard window covering.  
         [0017]     These and other features and advantages of the present invention will be set forth or will become more fully apparent in the description that follows. The features and advantages may be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. Furthermore, the features and advantages of the invention may be learned by the practice of the invention or will be obvious from the description, as set forth hereinafter.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0018]     The foregoing and other objects and features of the present invention will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only typical embodiments of the invention and are, therefore, not to be considered limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:  
         [0019]      FIG. 1  is a perspective view of a window opening within a rigid wall structure configured to receive a window frame assembly in accordance with the present invention;  
         [0020]      FIG. 2  is a perspective cut-away view of the perspective view of  FIG. 1 , showing the internal wall members in relation to the overall wall structure and window opening, as well as in relation to the window frame assembly of the present invention;  
         [0021]      FIG. 3  is a cross-sectional perspective view of a first embodiment of the core substrate and flange of the present invention;  
         [0022]      FIG. 4  is a cross-sectional perspective view of a second embodiment of the core substrate and flange of the present invention;  
         [0023]      FIG. 5  is a cross-sectional perspective view of a third embodiment of the core substrate and flange of the present invention;  
         [0024]      FIG. 6  is a cross-sectional perspective view of a core substrate, flange and decorative covering in accordance with selected embodiments of the present invention;  
         [0025]      FIG. 7  is a cross-sectional view of a core substrate, flange and decorative covering in accordance with a first embodiment of the present invention;  
         [0026]      FIG. 8  is a cross-sectional view of a core substrate, flange and decorative covering in accordance with a second embodiment of the present invention;  
         [0027]      FIG. 9  is a cross-sectional view of a core substrate, flange and decorative covering in accordance with a third embodiment of the present invention;  
         [0028]      FIG. 10  is a flow chart delineating the steps for the method of installing the window frame assembly of the present invention;  
         [0029]      FIG. 11  is a cut-away view of a method for adjoining perpendicular sections of a window frame in accordance with the present invention; and  
         [0030]      FIG. 12  is a cut-away view of an alternative method for adjoining perpendicular sections of a window frame in accordance with the present invention.  
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0031]     The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.  
         [0032]     As used in this specification, the term “window covering” refers to any shutter, blind, shade or any other window covering known to those in the art capable of being supported and/or retained by the window frame assembly described herein. The term “window jamb” refers to the supporting wall structure perpendicularly adjoining an outer edge of an installed window. The term “adjacent wall” indicates the supporting wall structure adjoining, generally at a substantially right angle, a window jamb at an edge opposite the edge adjacent a window. The terms “mounting hardware” and “hardware” refer to any hardware or combination of hardware capable of retaining the window frame assembly of the present invention against a window jamb or adjacent wall, including, but not limited to, screws, bolts, rivets, nails, staples, adhesives and cement. “Elasticity” refers to a property of a material in which strains or deformations are recoverable after an applied stress is removed. The term “modulus of elasticity” or “elastic modulus” is the ratio of stress to strain, measured in pounds per square inch (psi). Values corresponding to a modulus of elasticity, abbreviated herein as “E,” are given in terms of million psi. Thus, a board with a modulus of elasticity of 2,100,000 psi may be reported as 2.1 E.  
         [0033]     The present invention comprises a window frame assembly to facilitate the installation of a window covering  14  to cover an interior window  2 . Referring to  FIG. 1 , an interior window  2  comprises a window surface  4 , an associated window jamb  6 , an adjacent wall  8  and an edge  12  common to the window jamb  6  and adjacent wall  8 . A preexisting window molding  10  may frame a window  2  proximate the common edge  12 . If, however, a window  2  does not employ a preexisting window molding  10 , the present invention contemplates such a molding  10  as an element of selected embodiments of the present invention.  
         [0034]      FIG. 2  provides a perspective cut-away view of the elements of  FIG. 1 . Particularly,  FIG. 2  depicts internal wall stud members  18  in relation to an overall wall structure and window opening  2 , as well as in relation to the window covering frame assembly of the present invention. The window covering frame assembly of the present invention may be secured to a window jamb  6  or to an adjacent wall  8  by mounting hardware, or by any other means known to those skilled in the art. Preferably, as depicted in  FIG. 7 , an industrial screw  34  is driven through a core substrate  20  into a window jamb  6  or adjacent wall  8 , and further into an internal stud member  18 . This securing technique ensures proper attachment and reliability of the window frame assembly over time. Similarly, it is also preferred to secure a core substrate  20  at relatively small intervals along a window jamb  6  or adjacent wall  8  to provide additional support for the window frame assembly and attached window covering thereby retained.  
         [0035]     Referring now to  FIGS. 3-5 , selected embodiments of the present invention comprise a core substrate  20 , wherein the core substrate  20  comprises fiberglass, aluminum, graphite, reinforced plastic, or any other metal or material, or combination thereof, recognized by those skilled in the art as capable of both having a slim profile and having an elastic modulus sufficient to retain an interior window covering  14  (see  FIG. 7 ). A core substrate  20  further comprises an elongate lateral plate  22  having a perpendicularly attached flange  26 . Preferably, a thickness corresponding to each of the lateral plate  22  and the attached flange comprises less than {fraction (5/16)} inch (7.9 mm). Such a slim profile enables the window frame assembly of the present invention to be implemented in a variety of window openings  2  without interfering with the dimensions of the window opening  2  or with a preexisting window molding  10  in close proximity to the window opening  2 . In addition, the slim profile aspect of the present invention enables the window frame assembly to be transported and installed with minimal expense and labor.  
         [0036]     A slim profile core substrate  20  preferably comprises a high degree of elasticity to facilitate its ability to retain an interior window covering  14  over time. Indeed, a relatively inelastic substrate requires relatively greater mass to retain any given window covering  14 . Although most presently known window frame assemblies are made of wood, wood is not preferred for use in the present invention due to its characteristically low elasticity. An elastic modulus value for wood varies according to the species of wood. For example, Eastern Red Cedar is very soft softwood having an elastic modulus of 0.88 E. Pignut Hickory, on the other hand, is one of the strongest hardwoods, having an elastic modulus of 2.26 E. As one particularly desirable feature of the window frame assembly of the present invention is its slim profile, the core substrate of the present invention  20  comprises an elastic modulus greater than wood, preferably greater than 2.3 E. In this manner, the core substrate  20  of the present invention may comprise a thickness of less than {fraction (5/16)} inch without compromising its structural integrity or the security of the interior window covering  14  thereby retained.  
         [0037]     Referring now to  FIG. 3 , a core substrate  20  may comprise a variety of cross-sectional configurations depending on the conditions, features and desired effects for a particular window opening  2 . Specifically, where a window opening  2  has a preexisting window molding  10  closely aligned with the common edge  12 , it may be desirable to implement a core substrate  20  and associated flange  26 , wherein the cross-sectional shape of the integrally formed or attached substrate  20  and flange  26  resemble an “L.” A flange  26  preferably comprises a width sufficient to retain a hinge  16  pivotably attached to a window covering  14 . An elongate lateral plate  22  of the core substrate  20  may be attached to a window jamb  6  or adjacent wall  8  by mounting hardware or by any other means known to those in the art. According to this embodiment of the present invention, the rigidity of the elongate lateral plate  22  enables the plate  22  to be attached to the window jamb  6  or adjacent wall  8  in such a manner that the plate  22  is parallel the window opening  2 , despite variances in the drywall, paint or other subsequently applied wall applications. In addition, the elongate lateral plate  22  may implement a connecting channel  42  (see  FIG. 4 ) along its length that may be connected to a perpendicularly oriented connecting channel  42  along a second elongate lateral plate  22  to form the window frame assembly of the present invention. In this manner, the window frame assembly of the present invention ensures squareness with respect to the window opening  2 . This aspect of the present invention is discussed in more detail with reference to  FIGS. 11 and 12  below. This embodiment of the present invention may also implement any one of a variety of decorative coverings  28  to conceal any void between the window frame assembly and existing window molding  10 , as discussed in detail with reference to  FIGS. 6-9  below.  
         [0038]     Referring now to  FIG. 4 , certain alternative embodiments of the present invention comprise a core substrate  20  and a flange  26  integrally formed or attached to resemble, in cross-section, the shape of a “T”. According to such embodiments, the elongate lateral plate  22  of the core substrate  20  extends beyond the position of the flange  26  to create an extended edge  24 . The extended edge  24  may function to conceal and/or correct irregularities in the common edge  12 , as well as to retain a decorative covering  28 . A decorative covering  28  may comprise wood, plastic, paint, or any other material known to those in the art by which to substantially conceal an exposed portion of the core substrate  20  and/or enhance the appearance of the window opening  2 . Specifically, where a window opening  2  does not have a preexisting window molding  10 , the present invention contemplates implementing a window molding  10  as a decorative covering  28  attached to the core substrate  20  to substantially conceal the core substrate  20  as well as to enhance the overall appearance of the window opening  2 .  
         [0039]     Like the embodiment of the present invention depicted as  FIG. 3  above, the “T”-shaped embodiment of  FIG. 4  implements a flange  26  wide enough to accommodate a hinge  16  pivotably attached to a window covering  14 , such as a shutter. The embodiment of  FIG. 4  may also incorporate a connecting channel  42  aligned with the elongate lateral plate  22  to facilitate adjoining adjacent perpendicularly oriented lateral plates  22  to form a frame assembly in square with a window opening  2 .  
         [0040]     Referring now to  FIG. 5 , a core substrate  20  in accordance with the present invention may comprise a flange  26  perpendicularly disposed between two elongate lateral plates  22  and  27  on parallel planes such that a cross-sectional profile of the frame assembly thus formed resembles the shape of a “Z.” According to this embodiment of the present invention, like other embodiments previously discussed, the flange  26  comprises a width sufficient to accommodate a hinge  16  pivotably attached to a window covering  14 , such as a shutter. Further, an elongate lateral plate  22  may comprise a connecting channel  42  longitudinally disposed thereon to facilitate frame assembly as discussed above. Specifically, a corner bracket may be implemented to adjoin the connecting channel  42  of a first elongate lateral plate  22  to a perpendicularly oriented connecting channel  42  of a second elongate lateral plate. The “Z” orientation of the present embodiment enables the window covering to be mounted inside the window opening  2  while enabling a peripheral elongate lateral plate  27  to conceal and/or correct irregularities in the corner edge  12 . Further, the peripheral elongate lateral plate  27  may function to retain a decorative covering  28  of the user&#39;s choice.  
         [0041]     Referring now to  FIG. 6 , a core substrate  20  and/or flange  26  may incorporate one or more retaining tabs  30  to receive a decorative covering  28 . A decorative covering  28  preferably comprises wood or wood composite decoration resembling a traditional wood molding. Unlike a traditional wood molding, however, the decorative covering  28  may incorporate notches  32  corresponding to retaining tabs  30  provided in the core substrate  20 . The decorative covering  28  may be attached to the core substrate  20  by aligning the notches  32  with the retaining tabs  30  and pressing the decorative covering  28  against the core substrate  20  to ensure a press fit.  
         [0042]     Alternatively, a decorative covering  28  may be retained against a core substrate  20  by traditional fastening means, including but not limited to mounting hardware and/or any other fastening means known to those in the art. A decorative covering  28  may further employ a channel  44  within its underside surface to accommodate any portion of a screw or other hardware that may project from the wall subsequent to its use in securing a core substrate  20  in place.  
         [0043]     In addition, a decorative covering  28  may comprise a plurality of interlocking components. By way of example and not limitation, the decorative covering  28  may comprise a frame base  38  and a concealing strip  40 , where the frame base  38  may further comprise a groove configured to retain a tongue of the concealing strip  40 . When the concealing strip  40  is properly disposed into the frame base  38 , the two components form a locking tongue and groove junction, thereby concealing any hardware used to affix the decorative covering  28  to an adjacent wall  8 . Further, where the frame base  38  is properly positioned in relation to a core substrate  20 , a screw or other mounting hardware known to those in the art may be driven through both the frame base  38  and the core substrate  20  to affix both to an adjacent wall  8 . A concealing strip  40  may then be disposed into the frame base  38  to conceal such screw or other mounting hardware.  
         [0044]     Referring now to  FIG. 7 , a core substrate  20  may incorporate a hardware concealing channel  36  into an elongate lateral plate  22  to facilitate installation of the window frame assembly of the present invention. The hardware concealing channel  36  may be premarked or predrilled to receive a screw  34  or other mounting hardware, wherein such screw  34  ultimately engages an internal stud member  18  to fensure that the window frame assembly and attached window covering securely attach to the window opening  2 .  
         [0045]     According to one aspect of the embodiment of the present invention depicted by  FIG. 7 , a decorative covering  28  may comprise a substantially rigid insert  46  having dimensions appropriate to accommodate any void resulting between a preexisting window molding  10  and the window frame assembly when the window frame assembly is properly installed in square with the window opening  2 . Such an insert  46  may comprise wood, plastic or any other material known to those in the art capable of decoratively concealing a gap otherwise existing between the window frame assembly and a window molding  10 . According to this aspect of the present invention, a recess may be longitudinally disposed along the depth of the window molding  10  to retain a portion of the insert  36  therein. The core substrate  20  and/or flange  26  may also implement an insert engaging piece  48  to further secure the insert  46  in a substantially fixed position relative to the window frame assembly and preexisting window molding  10 .  
         [0046]     Referring to  FIG. 8 , it is not uncommon to witness substantial variation in the dimensions of voids existing between the window frame assembly and a preexisting window molding  10  along a length of a window opening  2 . A deformable material capable of accommodating such variation is thus preferred. According to certain embodiments of the present invention, a decorative covering  28  comprises a deformable material including, but not limited to, foam rubber, flexible plastic or composite fill, which functions to substantially conceal any gap otherwise present between the window frame assembly and a window molding  10 .  
         [0047]     In selected embodiments, a decorative covering  28  comprises deformable plastic. According to this embodiment of the present invention, an edge of a plastic strip  50  attaches to an externally exposed surface of the flange  26  at a point beyond the common edge  12 . The plastic strip  50  may be provided having a width sufficient to enable the plastic strip  50  to be substantially retained in either a flexed or relaxed state between the flange  26  and a window molding  10  to substantially conceal a uniform or non-uniform gap otherwise existing therebetween.  
         [0048]     Referring now to  FIG. 9 , a decorative covering  28  may alternatively be implemented as a deformable and substantially resilient material such as foam rubber. Such a decorative covering  28  may optionally comprise a hollow channel to enhance its resiliency. According to one aspect of the present embodiment of the present invention, a window frame assembly may further comprise an engaging member  52  affixed to an externally exposed surface of the attached flange  26 . Alternatively, the engaging member  52  may be integrally formed with the flange  26 . In selected embodiments, the decorative covering  28  comprises an aperture conforming to the engaging member  52  such that the engaging member  52  effectively retains the decorative covering  28  in a substantially fixed position relative to the flange  26 .  
         [0049]     Referring now to  FIG. 10 , a method for installing the window frame assembly of the present invention may depend on whether the subject window opening  2  bears industry standard dimensions. If the answer is yes, it will likely be possible to purchase a window frame assembly pre-sized to accommodate the subject window opening  2 , thus circumventing steps one and two of the present method. If the window is irregularly shaped or bears unique dimensions, on the other hand, the first step for installing the window frame assembly of the present invention may be to measure the window opening dimensions  60 , after which a core substrate and decorative covering may be appropriately sized  62 . The third step comprises substantially adjoining adjacent core substrates  64  to form a window frame. This step may be accomplished by any means known in the art, including, but not limited to, mitering and bracketing abutting edges. In addition, the third step  64  may be facilitated by connecting channels  42  longitudinally disposed along each elongate lateral plate  22 , as discussed above. A fourth step comprises securing the window frame adjacent a window opening  66  such that the window frame is substantially in square with the window opening. An optional fifth step  68  provides for affixing a shutter or other window covering to at least a portion of the window frame such that the window covering may be substantially retained thereby. A final step  70  contemplates engaging a decorative covering with at least a portion of the window frame such that the decorative covering may be retained substantially adjacent an adjacent wall and proximate a window opening.  
         [0050]     Referring to  FIG. 11 , an external bracket  80  may be used to join and reinforce a mitered joint between lengths of a window frame assembly, as discussed above with reference to the third step of the method of  FIG. 10 . The external bracket  80  may be attached to each decorative covering  28  and/or core substrate  20  and flange  26  forming the mitered joint using one or more screws or other suitable means of attachment such as rivets, bolts and the like. In certain embodiments, flat head screws that sit flush with the surface of the external bracket  80  may be used.  
         [0051]     Referring to  FIG. 12 , in certain embodiments an internal bracket  82  may be used to reinforce and join a mitered joint between lengths of a window frame assembly. For example, as discussed above, an elongate lateral plate  22  may incorporate a connecting channel  42  longitudinally disposed thereon. An internal bracket  82  may then be affixed to each of two perpendicularly oriented connecting channels  42  disposed upon adjacent lengths of window frame to secure the associated core substrates  20  and/or brackets  26  in square. Screws or other attachment means may extend through any decorative coverings  28  into the internal bracket  82  to further ensure a fixed relationship between adjacent decorative coverings  28 .

Summary:
An aesthetically pleasing, slim profile window frame assembly that is capable of retaining a shutter. Specifically, the window frame assembly of the present invention comprises a core substrate coupled to a flange. Certain embodiments of the present invention comprise a core substrate having a thickness less than {fraction (5/16)} inch and having, by volume, an elastic modulus greater than wood. A flange comprises a depth sufficient to retain a hinge attached to a window covering, such as a shutter. Certain embodiments of the present invention provide for a decorative covering to be coupled to the core substrate and/or flange such that a portion of the window frame assembly is thereby concealed. The improved strength per volume of the present invention facilitates shutter installation by a “do-it-yourself” homeowner or handyman as well as by a skilled carpenter.