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Definition of Group art unit

Group art unit Definition from Law Dictionaries & Glossaries
USPTO Patent and Trademark Glossary
(may be abbreviated "AU," "GAU" or "Grp Art Unit" on Office correspondence) - a working unit responsible for a cluster of related patent art. Staffed by one supervisory patent examiner (SPE) and a number of patent examiners who determine patentability on applications for a patent. Group Art Units are currently identified by a four digit number, i.e., 1642.

Context: Patent 
By the United States Patent and Trademark Office