A sealed crustless sandwich is a foodstuff comprising a filling sealed between two layers of bread by a crimped edge, with the crust subsequently removed. A popular variety in the United States is peanut butter and jelly. Sealed crustless sandwiches are mass-produced by The J. M. Smucker Company under the brand name "Uncrustables". The United States Patent and Trademark Office has issued a number of patents for various versions of sealed crustless sandwiches. These include U.S. Patent 2,463,439, U.S. Patent 3,782,270, U.S. Patent 6,004,596 and U.S. Patent 6,874,409. The 6004596 patent has been especially controversial since, according to critics, it patents an obvious and well known concept. On September 25, 2007, the Patent and Trademark Office concluded a reexamination of the 6004596 patent and issued a certificate cancelling all claims. The sandwich has been loosely categorized as a dumpling or ravioli because of its crimping, usually in a humorous fashion analogous to a Pop-Tart being classified similarly. The manufacturer of "Uncrustables", however, unequivocally describes their product as a sandwich. (en)