Herb grinder
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United States of America Patent
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Jan 28, 2014
Grant Date -
Jul 26, 2012
app pub date -
Jan 20, 2011
filing date -
Jan 20, 2011
priority date (Note) -
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Abstract
A herb grinder includes a metal sheet having a first surface and an opposite second surface. the sheet being configured to include, on at least one of the surfaces, a plurality of grooves extending parallel with one another and spaced apart from one another, wherein the grooves and said at least one of the surfaces, a plurality of grooves extending parallel with one another and spaced apart from one another, wherein the grooves and at least one of the surfaces define a square wave shape having flat valleys and flat peaks, wherein the flat valleys are roughened by a process of photochemical etching. A plurality of holes of a first type, extending from a peak to the bottom surface of the metal sheet, and a plurality of holes of a second type extending from a valley to the bottom surface of the metal sheet.
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