Double layer card
TECHNICAL FIELD 
     The present invention relates to a double layer card of particular utility in the areas of advertising and promotion. The advertising piece, a double layer card, may be bound into a book or magazine, or function as a free-standing advertisement. 
     BACKGROUND OF THE INVENTION 
     In recent years, the volume of print advertising to which the public is exposed has grown enormously. Boundless resources and ingenuity have been devoted to the goal of differentiating one advertising piece from others that compete for the attention of the same intended customer. In a society where thousands or even millions of copies of an advertising piece are printed and distributed to would-be readers, an invention that increases even slightly the percentage of readers who read it or respond to it is of value and utility. 
     One popular advertising device is the familiar postal reply card. A postal reply card can be used as an independent advertising piece, for example as part of a cooperative mailing program or can be bound or &#34;blown&#34; loose into a book or magazine, where it remains until the reader picks up the magazine and turns the pages. The average consumer is exposed o a multiplicity of such cards, diminishing the likelihood that each card will receive the full and undivided attention of the reader. 
     Another device described in U.S. Pat. No. 1,957,374 of Unger is a two-layer advertising mailer bearing the address of the recipient, comprising a separate ink blotting layer securedto a backing layer. In that device which is mailed to the consumer, the backing blotter layer is perforated with the intention that one may remove and return a preaddressed business reply card leaving the advertising ink blotter in the hands of the consumer. 
     Other double layer advertising devices are known but the perforated area as shown in U.S. Pat. No. 1,957,374 have had square corners. Experience shows that perforated areas with square corners cannot be easily removed in a reliable way without unwanted tearing of the material which makes them unsightly and difficult to use or retain. This is a particular problem when the double layer card is designed for use as reply post card and must remain intact once the area is removed. 
     It is an object of the present invention to provide a novel double layer card useful as an advertising piece that has an improved likelihood of receiving the attention of the reader and yields an easily removable postal reply card suitable for mailing. 
     SUMMARY OF THE INVENTION 
     The invention is a double layer card, having a front card and a rear card joined at the perimeter, the front card having a removable printed flap which covers printed areas on the rear card below it. The front card has perforations in the unjoined area defining a removable flap with a rounded corner. The flap has at least one rounded corner in order that it may be easily removed from the front card to reveal the printed areas on the rear card and the back of the flap. The front and rear cards are preferably joined by being glued together at the perimeter only allowing the flap to be easily removed from the front card without tearing. In the preferred embodiment after the flap is removed the uncovered rear card forms a postal reply card which is preaddressed on the backside. The printed flap once removed can be discarded or retained by the user depending on the nature of the message or information on the flap. 
     In a preferred embodiment, printed information on the front card of the double layer card and the removable flap urges the reader to remove the perforated flap. Ideally the reader becomes curious as to what is under the flap, and since no cost and little effort are involved, the reader may proceed to do so. The printed information revealed upon removal of the flap ideally receives more attention than it would if it had been visible from the outset, giving rise to a better response rate than conventional advertising cards. The removable flap may also be printed with useful information which the user might retain and serve as a continuing reminder of the advertisement or the product. The uncovered rear card serves as the reply card with a place, usually under the flap, for the consumer&#39;s name and address and preaddressed with the advertiser&#39;s address on the backside of the rear card. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows the double layer card of the invention, with the flap partially removed. 
     FIG. 2 shows the rear and front card in the preferred embodiment prior to folding. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The invention will now be described in more detail with specific reference to FIGS. 1-2. 
     The double layer card 1 comprises a front card 1b and a rear card 1a preferably attached by gluing or stapling together at the perimeter to form the double layer card 1. On the front card 1b there is an unattached area 3 and attached margin area 5. Also provided on the front card is a perforated flap 2 with at least one rounded corner 9, shown partially removed, which may be easily removed in its entirety without tearing to reveal unglued area 10 on the rear card 1a where more information may be printed. 
     As can be seen from FIG. 1, the perforated flap 2, when removed, has on its reverse side an additional area 4 where still more information may be printed. 
     Flap 2 is removable from the unattached area 10 of the rear card because of perforation 6, which in the figure is shown as a substantially rectangular perforation having a rounded area at lower right corner 9, and provides a convenient and easy means to remove perforated flap 2. The rounded corner 9 is preferably die cut and may further optionally represent a large continuously die cut region on the front card 1b, which construction allows the user to employ a fingernail or letter opener to further loosen and remove the flap and expose area 10. 
     The double layer card 1 is composed of a rear card 1a and a front card 1b, shown in FIG. 2 as a single piece. FIG. 2 shows the preferred embodiment with the rear card, and the front card of the double card of FIG. 1, prior to folding along line 13 and gluing around the perimeter to form the double layer card 1. Perforation 6 defines flap 2 which, when removed, leaves a margin area 5. 
     In the manufacture of the invention, cards 1a and 1b are preferably prepared and printed as one single piece which is folded to form the double layer card. Glue is applied to the area 11 of rear card 1a, as shown in FIG. 2. Alternatively, the glue may be applied to the back of the margin 5 on the front card. The printed card is folded so that the front card 1b is placed in contact with rear card 1a and the glue is allowed to set. In the preferred embodiment the piece is printed, glued and folded all in one machine step. 
     Optionally an additional perforation 8 may be provided on the double layer card as shown in FIGS. 1 and 2 defining a tab 7 which may be bound into a book or magazine. Perforation 8, may be made after the front card and rear card are attached to each other but preferably the perforation 8a may be made on the unfolded piece as shown in FIG. 2, defining tab 7. The reader removes the bound double layer card 1 from the book or magazine binding by tearing perforation 8, leaving tab 7 bound in place in the book or magazine. 
     In the preferred embodiment the back side of rear card 1a may be printed to form the preaddressed side of a standard postal reply card. After the flap 2 has been removed and the message read, the reader may conveniently fill in a name and address and mail the card to obtain additional information or make a purchase or obtain merchandise. The card stock used in making the double layer card as well as the stiffness, thickness, dimensions may vary depending on the use to which the card will be put. If the card is to function as a postal reply card the card stock and address printing are selected so as to satisfy postal service requirements. For example, a preprinted bar code may appear below the address lines, and an FIM (facing identification mark) may appear at the upper edge of the address side, in keeping with postal service guidelines. Ideally, space is provided in area 10 where the reader may write a name, address, or other information once the flap is removed. 
     The shape of flap 2, and of areas 3, 4, 5, 10, and 11, are all determined by the shape of perforation 6 and rounded corner 9. In FIGS. 1-2 the perforation is shown as basically rectangular with a rounded area at 9, giving rise to a basically rectangular flap 2 and areas 3, 4, and 10, and leaving corresponding areas 5 and 11 of substantially constant width. The double layer card can have a wide variety of shapes for perforation 6, and thus for areas 3, 4, 5, 10, and 11. Perforation 6 may, for example, be round, oval, or irregular, provided that a rounded preferably die cut corner 9 is used to insure ease of removal of the flap without tearing.