Belden Inc. owns U.S. Patent No. 6,074,503, which discloses and claims a method for making a communications cable. On a petition for inter partes review under 35 U.S.C. § 311 et seq. filed by the predecessor of Berk-Tek LLC, the Patent and Trademark Office’s Patent Trial and Appeal Board instituted a review and later reached a mixed decision: it rejected claims 1–4 of the ’503 patent for obviousness, while confirming claims 5 and 6. We now affirm the rejection of claims 1–4 and reverse the upholding of claims 5 and 6. We also reject Belden’s contention that the Board denied it procedural rights in the review.