The legal description:
A rectilinear array of uniform, smooth-sided, flat-topped, cylindrical, co-planar protuberances, the proportions of height, diameter and center-to-center spacing of which are approximately 2 : 5 : 8. Where there is more than one row of protuberances, they are arranged in mutually orthogonal rows and columns.
Kirkbi AG v. Ritvik Holdings Inc. 2005 SCC 65 at para. 41