The core issue revolves around the interpretation of certain terms within Fintiv's patents related to a "payment handler" or "payment handler service" in a cloud-based transaction system. The District Court had previously ruled these terms indefinite, finding they recited functions without disclosing sufficient structure as required by patent law, specifically under 35 U.S.C. § 112 ¶ 6. The Federal Circuit reviews the lower court's decision, ultimately affirming that the payment-handler terms invoke this section of law and that the patent specifications lack the necessary structural or algorithmic details, leading to the claims being deemed invalid due to indefiniteness.

Detailed case summary here