Prosecution disclaimer can be tough to prove. Practiced prosecution counsel seem to know how to phrase things in such a way that a patent examiner understands them to be different from the claimed invention, but a later court may still find the opposite.
In an opinion today, Judge Andrews reversed a prosecution disclaimer finding by Magistrate Judge Fallon. The patent claims involves a "tethered digital butler" that can perform smartphone-like functions in a lower-cost way by using cheaper hardware that may be "tethered" to a desktop computer, which takes care of the heavy lifting.
Specifically, the claims discuss a "palm held remote," and the parties disputed …