You are an expert at summarizing long articles. Proceed to summarize the following text:

You are an expert at summarizing long articles. Proceed to summarize the following text: 
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a portable arrangement for ensuring privacy during use of a public toilet. The arrangement includes a screen in the form of a generally rectangular or square piece of sheet material with an embedded suction cup or other attachment means at each corner. Secured to the screen is a smaller pouch into which the screen can be folded and secured by a zipper for transport. 
     The sheet material is dimensioned to extend across the width of the door of a public restroom stall, to cover a substantial part of the vertical gaps, openings, or slots formed between walls of the stall and vertical edges on each side of the door, and to be held in position by adhesion of the suction cups to the walls of the stall, so as to ensure that the occupant of the stall cannot be viewed through the vertical openings by a person standing outside the stall. 
     2. Description of Related Art 
     The privacy arrangement of the invention is especially suitable for use by any individual who desires greater privacy than is provided by a typical public restroom stall. 
     Although individuals may desire additional privacy for a variety of reasons, there is an especially critical need for such additional privacy in the case of individuals who have had abdominal surgery and are required to use a colostomy bag. Use of a colostomy bag entails frontal exposure that can easily be viewed through the gap between the door and walls of the toilet stall, and that can cause the individual to avoid use of public toilets, limiting movement or participation in activities by the individual away from home. 
     It is known to provide privacy screens for portable bathroom assemblies or urinals of type designed for outdoor activities such as campouts, as disclosed in U.S. Pat. Nos. 5,937,452, 6,374,432, and 7,185,375, but the screens entirely surround the bathroom assembly or urinal, and are not suitable for protecting privacy in a conventional fixed bathroom stall. 
     It is also known to provide portable screen structures that serve as dressing rooms, the screen structure having a door through which an individual enters, and which either entirely surrounds the individual or encloses three sides of the individual, the fourth side being shielded by a structure or vehicle, to provide privacy when changing clothes, as disclosed in U.S. Pat. Nos. 6,840,254 and 7,464,983. Such structures are too large to be easily carried during everyday activities, and cannot be used to provide privacy in a public bathroom stall. 
     Finally, it is also known to provide a personal cover that fold into a pouch, as disclosed in U.S. Pat. No. 6,393,637, but the personal cover is in the form of a sleeping bag or poncho, and cannot be used as a privacy screen in a public restroom stall. 
     Each of the above-described prior art privacy screens is designed to substantially surround a person and/or a bathroom assembly or urinal, and therefore insufficiently portable to carry around during daily activities such as shopping or dining out. Furthermore, none is suitable for ensuring privacy in public bathroom stalls, in which only the gaps between the door and walls of the stall need to be screened. 
     SUMMARY OF THE INVENTION 
     It is accordingly an objective of the invention to provide an arrangement for ensuring privacy in public restroom stalls, by ensuring that a user of the stall cannot be seen from outside the stall. 
     This objective is achieved, in accordance with the principles of a preferred embodiment of the invention, by a privacy arrangement that includes a screen in the form of a generally rectangular or square piece of sheet material with an embedded attachment means at each corner. Secured to the screen is a smaller pouch into which the screen can be folded and secured by a zipper, or other fasteners such as buttons, snaps, or Velcro™, for transport. 
     The attachment means may be in the form of a suction cup provided at each corner of the sheet material, although those skilled in the art will appreciate that other attachment means may be substituted for one or more of the suction cups, or provided in addition to the suction cups, such as magnets or hooks that engage the tops of the walls and door of the stall. 
     The sheet material is preferably a lightweight, easily foldable material that is sufficiently opaque as to protect the privacy of a user of the stall when the material is placed over the openings or gaps between the door and walls of the stall, and secured to the stall by the suction cups or other attachment means. Perfect opacity is not necessarily required, so long as the material provides a screening effect that prevents a person outside the stall from recognizing or perceiving activities and persons within the stall. A suitable lightweight and sufficiently opaque material is nylon, although the invention is not to be limited to a particular material. 
     The dimensions of the sheet material are important in that the material must have sufficient length to extend over the gaps or openings at each side of the bathroom stall door, and sufficient width to cover enough of the length of the gaps or openings to provide a requisite degree of privacy. Exemplary dimensions of the sheet material are 5′×5′, although these dimensions may be varied without departing from the scope of the invention so long as the length is greater than the width of a bathroom stall door and the height is sufficient to prevent viewing by standing, or possibly standing and crouching, persons of different heights. A standard bathroom stall door is 58″ high, but doors are also available in the range from 48″ to 70″ (see, e.g., www.allpartitions.com/doors1.html), while door widths typically range from 20″ to 48″ (the Americans with Disabilities Act (ADA) sets a minimum door opening width of 36″ and stall width of 60″ for stalls accessible to the disabled. Based on these dimensions, the sheet material of the invention should not be limited to 5′×5′, but rather may be varied substantially, so long as the sheet is capable of covering gaps on either side of the stall door and has sufficient height to ensure privacy. For the U.S., a minimum length of greater than 30 inches, and a minimum height of 48 inches, appears to be desirable, though these minimum dimensions may be different in other countries and may also change to meet legal requirements such as changes in the ADA or local rules. Those skilled in the art will appreciate that the screen need not be perfectly rectangular or square so long as it is capable of extending over the width of the door and covering the gaps between the door and the walls of the stall. 
     According to the preferred embodiment of the invention, the privacy screen includes a pouch into which the screen can be folded when not in use. The pouch is secured to or integrated with the screen so that the pouch is immediately available when stall activities have concluded, at which time the screen can simply be folded and tucked into the pouch. A closure, such as a zipper extending along three edges of the pouch, is provided to secure the screen within the pouch for transport, and a strap may be provided to facilitate carrying. The dimensions of the pouch are selected for portability, for example so that the pouch can be carried in a woman&#39;s purse or a jacket pocket. Suitable dimensions are 6″×1.75″×4″, although these dimensions may be varied without departing from the scope of the invention. 
     In an especially preferred embodiment of the invention, the pouch is formed separately from the panel, and is sewn or stitched to a main panel of the screen. The main panel includes a generally rectangular or square opening that is preferably at or near a center of the main panel, the dimensions of the opening corresponding to dimensions of a side of the pouch. The pouch includes a back panel having dimensions corresponding to the dimensions of the opening, four side panels having a width corresponding to the thickness of the pouch, and a flap having dimensions corresponding to dimensions of the back panel, with one side of the flap being secured to the one of the side panels to form a hinge that allows the flap to be opened and closed. The top edges of the side panels are stitched to the panel along the edges of the opening when the flap is in the open position, so that the opening forms an opening of the pouch, such that the main panel of the screen preventing closure of the pouch. One part of a zipper is included on three edges of the opening and three edges of the flap to enable the flap to be secured to the main panel and thereby close the pouch when the main panel is folded into the pouch. According to this arrangement, the pouch is securely integrated into and inseparable from the main panel, thereby providing a convenient and readily accessible storage space into which the screen can easily be folded when the screen is not in use. 
     As an optional added feature, the pouch may include an additional pocket and closure for holding keys, money, and the like, eliminating the need for the user to carry a separate purse or wallet in addition to the pouch. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a conventional bathroom stall door, for which the screen of the present invention may be utilized. 
         FIG. 2  is an isometric view of a privacy screen of a preferred embodiment of the invention. 
         FIG. 3  shows the privacy screen of  FIG. 2 , after being attached to a bathroom stall of the type shown in  FIG. 1   
         FIG. 4  is an isometric view of a pouch and main panel, which are to be assembled together to form a screen according to a preferred embodiment of the invention. 
         FIG. 5  is an isometric view of the pouch and main panel of  FIG. 4 , after assembly to form a privacy screen. 
         FIG. 6  is an isometric view of the reverse side of the privacy screen of  FIG. 4 , illustrating the manner in which the main panel is folded into the pouch after use. 
         FIG. 7  is an isometric view of the pouch of  FIGS. 3-6 , after the main panel has been folded into the pouch. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Throughout the following description and drawings, like reference numbers/characters refer to like elements. It should be understood that, although specific exemplary embodiments are discussed herein there is no intent to limit the scope of present invention to such embodiments. To the contrary, it should be understood that the exemplary embodiments discussed herein are for illustrative purposes, and that modified and alternative embodiments may be implemented without departing from the scope of the present invention. 
       FIG. 1  shows a conventional bathroom stall arrangement of the type typically used in non-residential bathrooms. The illustrated stall arrangement includes stall access door  1  and portions of walls  2  and  3 , all of which are typically made of a metal such as steel, and extend from a few inches above floor  4  to a height sufficient to prevent a person standing on the ground from observing the interior of the stall through the space between the ceiling  5  and the tops of the door  1  and walls  2 ,  3 . One side of the door is attached to one of the walls  3  by hinges  6 , and a latch  7  is provided on the opposite side of the door to prevent the door from being opening by pushing on the door  1  from outside the stall. 
     In order to enable the door  1  to be easily opened and closed, the door  1  is space from the walls  2 , 3  by gaps  8  and  9  on each side of the door. The gaps  8 , 9  may have widths of anywhere from less than a quarter inch to a half inch or more. In general, adequate privacy is provided despite the gaps so long as a person on the outside of the stall is a sufficient distance away from the stall and does not intentionally attempt to view the interior of the stall. Nevertheless, it is often possible to look through the gaps into the stall. This possibility poses a disincentive to use of public restrooms can cause substantial discomfort or stress to individuals using the stall, and particularly individuals who have an enhanced need for privacy, such as colostomy patients. 
     As shown in  FIGS. 2 and 3 , the present invention provides a screen  30  that attaches to the walls  2 , 3  of a stall such as the one illustrated in  FIG. 1 , and that covers at least the vertical gaps  8 , 9  between walls  2 , 3  and door  1 . Screen  30  includes a main panel  31 , a pouch  32  attached to the main panel  31 , and means  33  for attaching the panel to walls  2 , 3  such that the screen  30  extends between the walls  2 , 3  and covers both vertical gaps  8 , 9 . 
     The attachment means  33  may be in the form of suction cups provided at each corner of the sheet material, but is not limited to suction cups. Alternative attachment means include, by way of example and not limitation, hooks that engage the tops of the walls and door of the stall, or magnets sewn into pockets adjacent at least two corners of the screen  30 . 
     The screen  30  is preferably made of a lightweight, easily foldable sheet material that is sufficiently opaque as to protect the privacy of a user of the stall when the material is placed over the openings or gaps between the door and walls of the stall, and secured to the stall by the suction cups or other attachment means. Perfect opacity is not necessarily required, so long as the material provides a screening effect that prevents a person outside the stall from recognizing or perceiving activities and persons within the stall. A suitable lightweight and sufficiently opaque material is a finely woven nylon mesh, although the invention is not to be limited to a particular material. 
     The screen  30  must have sufficient length to extend over the vertical gaps  8 , 9  or openings at each side of the bathroom stall door  1 , and sufficient width to prevent persons from peering over or under the screen in order to see into the stall. Exemplary dimensions of the sheet material are 5′×5′, although these dimensions may be varied without departing from the scope of the invention so long as the length is greater than the width of a bathroom stall door, including stall doors for the disabled, which must be wide enough to admit wheelchairs. The vertical extent or height of the screen must be sufficient to prevent viewing by standing, or possibly standing and crouching, persons of different heights. For the U.S., a minimum length of greater than 30 inches, and a minimum height of 48 inches, is preferred, although these minimum dimensions may be different in other countries and may also change to meet legal requirements such as changes in the ADA or local rules. 
       FIGS. 4-7  show a specific exemplary implementation of the privacy screen of  FIGS. 2 and 3 , including details of the construction of the privacy screen  30  and the manner in which a main panel  41  of the privacy screen may be folded into the integral pouch  40  for transport. The pouch  40  is secured to or integrated with the screen  30  so that the pouch is immediately available when stall activities have concluded, at which time the screen can simply be folded and tucked into the pouch. A closure, such as a zipper  42  extending along three edges of the pouch, is provided to secure the screen within the pouch for transport, and a strap  43  may be provided to facilitate carrying. The dimensions of the pouch are selected for portability, for example so that the pouch  40  can be carried in a woman&#39;s purse or a jacket pocket. Suitable dimensions are 6″×1.75″×4″, although these dimensions may be varied without departing from the scope of the invention. 
     As illustrated in  FIG. 4 , the pouch  40  is formed separately from the main panel  41 , and is then sewn, stitched, or otherwise attached to the main panel  41 , as illustrated in  FIG. 5 . In addition to or instead of stitching, the pouch may be attached by fabric glue, rivets, or any other fastening means. The material of the pouch  40  is preferably the same as that of the main panel  41 , although it is within the scope of the invention to make the pouch of a different material, such as vinyl, cloth, or leather, in order to provide a more attractive carrying case and/or provide environmental protection for the main panel  41  stored inside the pouch. 
     The main panel  41  includes a rectangular opening  43  that is preferably at or near a center of the main panel, the dimensions of the opening  43  corresponding to dimensions of a back panel  44  of the pouch. As best seen in  FIG. 7 , the pouch  40  includes the back panel  44  having dimensions corresponding to the dimensions of the opening  43 , four side panels  45 - 48  having a width corresponding to the thickness of the pouch, and a flap  49  having dimensions corresponding to dimensions of the back panel  44  to form a parallelepiped shaped container, with one side of the flap  49  being secured to the one of the side panels  45  to form a hinge  50  that allows the flap  49  to be opened and closed. The top edges  51  of the side panels are stitched or otherwise attached to the panel along the edges  52  of the opening  43  when the flap  49  is in the open position, so that the opening  43  forms an opening of the pouch, and such that the main panel  41  of the screen prevents closure of the pouch until the main panel has been folded into the pouch. One mating half of zipper  42  is included on three edges of the opening, while the other mating half of zipper  42  extends along the three edges of the opening  43  to enable the  49  flap to be secured to the main panel  41  and thereby close the pouch when the main panel  41  is folded into the pouch  40 . 
     As an optional added feature, shown in  FIG. 7 , the pouch may include an additional pocket  55  for carrying items such as cash, bank cards, keys, and other items that would normally be carried in a purse or wallet. The additional pocket is preferably accessible from outside the pouch when the screen is enclosed within the pouch, and may be secured by a separate closure such as a zipper. The pocket could be sewn into back panel  44 , side panels  45 - 48 , or flap  49 . 
       FIG. 6  shows the reverse side of the arrangement of  FIG. 5 , with arrows  54  indicating in schematic fashion the manner in which the edges of the main panel are folded into the pouch  40  before closure, although it will be appreciated that the main panel  41  may be folded multiple times before being positioned in the pouch. The main panel  41  may include creases (not shown) or other guides to facilitate folding.  FIG. 7  shows the pouch  40  after the main panel  41  has been folded into the opening  43  and before the flap  49  has been secured to the pouch by the zipper  42 . It will be appreciated that the zipper  42 , as well as the zipper of the optional pocket  50 , may be replaced by other closure elements, such as buttons, snaps, or Velcro™.

Summary:
A portable arrangement is provided for ensuring privacy during use of a public toilet. The arrangement includes a screen in the form of a generally rectangular or square piece of sheet material with an embedded suction cup or other attachment means at each corner. Secured to the screen is a smaller pouch into which the screen can be folded for transport.