WALLACH, Circuit Judge.
This appeal arises out of the United States Patent and Trademark Office's ("PTO") inter partes reexamination of United States Patent No. 6,715,639 ("the '639 patent"), assigned to Graphic Packaging International, Inc. ("Graphic"), and challenged by third-party requester C.W. Zumbiel Co., Inc. ("Zumbiel"). Because the Board of Patent Appeals and Interferences's ("Board")
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