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Exploring the Law of Embodiments After Phillips

By Peter J. Toren
November 28, 2006

The decision by the Federal Circuit in Phillips v. AWH Corp., 415 F.3d 1303 (Fed. Cir. 2005) (en banc) in July 2005 reaffirmed and amplified many of the court's prior decisions addressing various aspects of patent claim construction. In particular, it emphasized the critical role of the specification in determining what the claim means and stated that the specification 'is the single best guide to the meaning of a disputed term.' While the specification provides a number of sign posts or guides to interpreting a claim, one of the most important considerations is whether and how the patentee may have limited the invention to certain embodiments or may have distinguished the invention from prior inventions. It is important, therefore, for both patent prosecutors and litigators to understand how the Federal Circuit has approached the issue of limiting claims in a post-Phillips world based on the embodiments disclosed in the specification.

In general, since Phillips the Federal Circuit has been willing to limit the claim terms of a patent: 1) when the specification referred to the proposed limitation as 'the present invention,' 2) when the specification defined 'the focus of the invention' and the claim required the proposed limitation in order to fit into the 'focus of the invention'; or 3) when the specification only disclosed certain embodiments and failed to account for alternative embodiments. In contrast, the Federal Circuit has refused to limit a claim term to the embodiments disclosed in the specification when the specification envisioned alternative embodiments not containing the proposed limitation. Accordingly, it is critical for patent prosecutors to include a specification in the application that contains, if at all possible, alternative embodiments or indicates that the disclosed embodiment is 'merely a preferred embodiment of the claimed invention.'

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