Patent ID: 8820792

Claim:
An inside leaflet of a book, which is bond-bound with pages of the book to provide an advertisement, the inside leaflet comprising: an advertisement printed part having printed on one side a catchphrase or an illustration for advertisement; an instruction printed part on the same side that provides a direction to remove the leaflet from the book; a binding part including an outermost edge of the leaflet that is configured to be bond-bounded to a backbone of the book such that when bond-bounded only a very edge of the outermost edge of the binding part physically and directly contacts an adhesive applied to an entire inner surface of the backbone; wherein the outermost edge of the leaflet comprises less binding portions than outermost edges of the pages such that when the leaflet is detached from the backbone of the book no traces or marks are left by the inside leaflet; the very edge of the outermost edge of the binding part is disposed along a line that is farthest from a line corresponding to a middle of the leaflet; the binding part comprises a plurality of grooves that are formed with the same shape and are cut out at regular intervals along the outermost edge of the inside leaflet; and each groove comprises a semicircle shape and a ratio W 1 /W 2 of the end width W 1 to the opening width W 2 that is 0.2 to 0.3.