United Access Techs., LLC v. CenturyTel Broadband Servs., LLC, No. 14-1347 (Fed. Cir. 2015)
Annotate this CaseUnited owns three patents that recite systems for using a landline telephone connection for both voice communication and data transmission. They are directed to the use of exchanges that combine the voice and data components of the signal for transmission over the telephone line, and filters that separate those components so that they can be received as separate voice and data signals by a user. In 2002, United’s predecessor sued EarthLink, charging direct infringement because EarthLink offered its customers an Internet connection service based on a broadband digital communications technology, Asymmetrical Digital Subscriber Line (ADSL). EarthLink argued that the accused ADSL system did not include a “telephone device” as required by all asserted claims. The jury returned a general verdict of non-infringement. The Federal Circuit affirmed without opinion. In 2011, United sued CenturyTel and Qwest for infringing the same claims of the three patents. The district court dismissed on collateral estoppel grounds, noting that United did not articulate how the defendants’ systems were different from the systems that were the subjects of the Earthlink trial other than that the defendants’ services included telephone devices. The Federal Circuit reversed, reasoning that the earlier verdict could have been based on several grounds.
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