Cox Commc'ns, Inc. v. Sprint Commc'n Co., LP, No. 16-1013 (Fed. Cir. 2016)Annotate this Case
Sprint's patents concern voiceover-IP technology for transmitting calls over the internet, instead of through traditional telephone lines. The patents discuss the hand-off between traditional telephone lines (a “narrow-band network” or “circuit-switched network”) and a data network (a “broadband network” or “packet-switched network”), such as the internet. Both the “control patents” and the “ATM interworking patents” describe the use of a “processing system,” which receives a signal from a traditional telephone network and processes information related to the call to select the path that the call should take through the data network. In the control patents, a “communications control processor” selects the network elements and the connections for the path. In the ATM interworking patents, a “signaling processor” or a “call/connection manager” selects the virtual connections by which the call will pass through the ATM network and performs other functions, including validation, echo control, and billing. Both specifications disclose that logic for selecting a path resides in lookup-tables. The district court found the claims invalid as indefinite under 35 U.S.C. 112. The Federal Circuit reversed. The terms “processing system” does not prevent the claims, read in light of the specification and the prosecution history, from informing those skilled in the art about the scope of the invention with reasonable certainty.