Proper §112 Indefiniteness Analysis is Directed to the Claims Themselves, Not the Terms

federal-circuit-cafc-right-angleCox Commc’n, Inc. v. Sprint Commc’n Co., No. 2016-1013, 2016 U.S. App. LEXIS 17372 (Fed. Cir. Sep. 23, 2016) (Before Prost, CJ., Newman and Bryson, J.) (Opinion for the Court, Prost, CJ.)

The Federal Circuit reversed the lower court’s ruling of summary judgment. The lower court had granted summary judgment based on its finding that the asserted patents were indefinite under 35 U.S.C. § 112, ¶ 2.

The asserted Sprint patents relate to voice-over-IP technologies that describe and claim the use of a “processing system.” The district court granted partial summary judgment to Cox, because it found that the “processing system” was an indefinite structural limitation because it was only functionally described, and no applicable extrinsic evidence sufficiently defined the term.

The Federal Circuit Court found that the source of the purported indefiniteness (“processing system”) played no role in defining the claims. Since the asserted claims are method claims, patentability resides with the method steps and not with the machines performing those steps. The Court drove this point home by providing a “deletion test” that removed “processing system” from the claims, noting that the meaning (scope) of the claim would not change. The Court found that because “processing system” does not change the scope of the claims, it does not change whether a person of ordinary skill understands what the claims protect. Thus, there was no indefiniteness issue.

The Court noted that while claim construction and indefiniteness are inextricably intertwined, the indefiniteness inquiry is ultimately determined by the claims as a whole, not by isolated claim terms.

The Court disagreed with Cox’s contention that “processing system” is per se indefinite because it was described with functional language. The parties stipulated that the term was not in “means-plus-function” form, and there was no per se requirement to disclose a structure. Further, the functional language helped circumscribe the claims by specifying operations that the “processing system” must perform in order to practice the claimed method. Finally, the Court noted that the specification discloses sufficient information (in the form of embodiments, algorithm detail, query construction, mapping guidance, and processing details) for a person of ordinary skill in the art to understand the claims with reasonable certainty.

The concurrence addressed the Court’s “new mode” of analysis, by clarifying that the “deletion test” was really not a per se test for indefiniteness, and instead was an example of a way to show that the claims were not rendered indefinite by the functional term at issue.

The Court emphasized two points. First, a proper indefiniteness analysis is directed to the claims as a whole and not to isolated terms therein. Second, functional language that is not in means-plus-function form does not per se make a claim indefinite for lack of structure, e.g. when the artisan would reasonably understand the scope and meaning of the claim.




Warning & Disclaimer: The pages, articles and comments on do not constitute legal advice, nor do they create any attorney-client relationship. The articles published express the personal opinion and views of the author as of the time of publication and should not be attributed to the author’s employer, clients or the sponsors of

Join the Discussion

2 comments so far.

  • [Avatar for Benny]
    October 1, 2016 05:50 am

    Yes, you could argue that symbolic computation does not require an arithmetic logic unit. You could also argue that the world is flat, and you would be eqally convincing on both counts.

  • [Avatar for Prizzi's Glory]
    Prizzi’s Glory
    September 30, 2016 01:16 pm

    The terminological usage is probably not relevant to this patent except historically, but before 1983, AT&T Bell Labs & Western Electric documentation tended to avoid terms like computer and computing system because AT&T was legally barred from the computer business. Processing system was generally the recommended term because typically program executing electronics used in AT&T switches could not do floating point computation and integer computation if available was highly limited.

    Of course, one could argue that string or symbolic computation does not require an arithmetic logic or floating-point unit.