A testament to the efficacy of the US Patent system:

Smucker's sues over infringement of its peanut-butter-and-jelly sandwich patent

U.S. Patent 6,004,596 contains such gems as: "first bread layer having a first perimeter surface coplanar to a contact surface" and its careful legalistic delineation "wherein said first filling" is "comprised of peanut butter" and a "second filling is comprised of a jelly."