Why the meaning of a few words matters so much
Claim construction is the step in a patent case where the court interprets disputed terms in the patent's claims. Judges treat it as a legal question, decided by the court rather than a jury, often after a separate proceeding called a Markman hearing. A narrow reading can take an accused product outside the patent, while a broad one can sweep it in and also expose the patent to invalidity arguments based on earlier technology. Because so much rides on it, many cases settle or are resolved on motion soon after the ruling. This keyword sometimes confuses people outside patent law; it has nothing to do with building construction.
What the court reads
Courts start with the patent itself: the claim language, the written description, and the record of what the applicant told the patent office while the patent was being examined. Statements made during examination can narrow a term, even if the claim language alone seems broad. Dictionaries, technical treatises, and testimony from technical witnesses can be considered, but they generally carry less weight than the patent's own record. Many federal districts have local patent rules requiring the parties to exchange proposed terms and constructions on a fixed schedule. Proceedings before the patent office's trial board, which can challenge a patent's validity, now use a similar standard for reading claims.
Preparing early
The constructions you propose have to fit both your infringement position and your validity position, and the two can pull in different directions. That is why we look at claim construction from the start of a dispute rather than when the court's schedule requires it. We review the patent, its examination history, related patents in the same family, and the accused product or process. We talk about which terms are likely to be disputed and what testimony may be needed. If a dispute has not yet become a lawsuit, an early read on likely constructions can inform whether to license, design around, or challenge the patent.
