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Getting to Know Means-Plus-Function Claims: Does 'Means' Always Mean 'Means'?

By Paul A. Ragusa and Noera Ayaz
May 26, 2005

Means-plus-function claims are a controversial part of claim drafting. On one hand, patent practitioners face the dilemma of whether or not to use such claims in an application, as they may narrow the scope of the patent protection through their dependence on what is described in the specification. On the other hand, such claims may be a complete, simple and elegant way to claim an invention that uses various types of a certain limitation, as in the software field. If a patent practitioner does decide to use means-plus-function claims, he or she should be aware that using the term “means” does not always mean that the claim is a means-plus-function claim. Likewise, the lack of the term “means” does not always mean that a claim is not in means-plus-function form, as exemplified in the recent case law discussed below.

The statutory basis for means-plus-function claims is found in 35 U.S.C. '112, ' 6 which provides the following:

An element in a claim for a combination may be expressed as a means or step for performing a specified function without the recital of structure, material, or acts in support thereof, and such claim shall be construed to cover the corresponding structure, material, or acts described in the specification and equivalents thereof.

Before drafting the claims, it is useful to have an understanding of what terminology the Federal Circuit considers to be in means-plus-function form. In construing claims that include a means-plus-function limitation, a court will first identify the claimed function and then the corresponding structure in the specification for performing the claimed function. But before doing so, the court must determine whether the particular limitation is in fact a means-plus-function limitation and it is in that determination where things can become unpredictable.

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