Patent ID: 8672249

Claim:
A herb grinder comprising: a metal sheet having a first surface and second surface opposite the first surface, the sheet being configured to include, on the first surface, a plurality of grooves, each groove extending parallel with one another and spaced apart from one another, wherein the grooves and the first surface define, in cross section, a square wave shape having valleys and peaks, wherein each valley has a planar floor that is roughened to provide a finely abrasive surface, and each peak has a planar cap that is not roughened; a plurality of holes of a first type, the first type of hole extending from a peak to the second surface of the metal sheet; a plurality of holes of a second type, the second type of hole extending from a valley to the second surface of the metal sheet; an opening adjacent an edge of the metal sheet; a flexible link fastened to the metal sheet through the opening.