Interpreting patent claims: Actavis v Eli Lilley

It's now 13 years since Lord Hoffmann told us definitively how to interpret patents claims, in his opinion in Kirin Amgen v Hoechst Marion Roussel [2005] 1 All ER 667. The courts had spent a lot of time pondering how to do what should have been a pretty simple task: judges have always been in the business of finding the meaning of legal documents, and patent claims should never have been much different. Or should they? For many years the courts have eschewed (nice word) a literal interpretation and chosen instead to look at the claims as practical documents written for practical readers.I have never bought into that view (but who cares what I think?). Patent claims are usually written by highly skilled and trained patent attorneys for other patent attorneys, members of the patent bar and ultimately specialist judges to read. Why should it be necessary to adopt a different rule about interpretation from that which governs the interpretation of, say, conveyances?I suppose…

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