Posts Tagged: "Claim Limitations"

In Knauf Insulation, Inc. v. Rockwool International, the U.S. Court of Appeals for the Federal Circuit vacated and remanded the Patent Trial and Appeal Board’s determination in an inter partes reexamination that certain patent claims for two of Knauf’s patents covering fibrous products and related methods and binder and fiber glass products were obvious. The Court also found that certain other claims of the two patents were not unpatentable as obvious, and Rockwool International cross-appealed that determination, but the Court held that Rockwool did not have standing to cross-appeal and thus dismissed it. The decision was not precedential, but some have commented that the Court’s holding with respect to Rockwool’s lack of standing for a cross-appeal could have significant implications.

In the past 10 months, the issue of proving negative claim limitations has cropped up on appeals to the Federal Circuit. At least three panels of the Federal Circuit have addressed the issue, to one degree or another. Each panel has contributed, to some extent, to an understanding of the law. In dealing with the issue, each panel cited no precedent for doing so. Curiously, all three decisions were designated as nonprecedential. The negative claim limitations issue is one that is almost certain to recur. Perhaps the next time the issue comes up, the decision ought to be precedential, and therefore, binding.

U.S. District Judge Indira Talwani of the District of Massachusetts signed an order dismissing a patent infringement suit brought by Malvern, PA-based wireless medical technology company CardioNet against Lowell, MA-based patient monitoring tech developer InfoBionic. Judge Talwani dismissed the suit after CardioNet’s asserted patent, which covers systems and techniques for monitoring cardiac activity, was found to be directed to patent-ineligible subject matter under 35 U.S.C. § 101… CardioNet filed a motion for leave to file a supplemental brief in support of the eligibility of the ‘207 patent arguing that the Federal Circuit’s decisions in Aatrix Software v. Green Shades Software and Berkheimer v. HP changed Section 101 precedent impacting several aspects of the district court’s patent eligibility analysis. However, Judge Talwani denied CardioNet’s motion a few days after it was filed.

On appeal to the Federal Circuit, Zeroclick argued that the district court erred in construing those two terms as means-plus-function limitations, an argument with which the Federal Circuit panel agreed. “Neither of the limitations at issue uses the word ‘means,’” Circuit Judge Hughes writes in his majority opinion. “Presumptively, therefore, [Section 112(f)] does not apply to the limitations.” Although Apple argued in the district court that the claims must be construed under Section 112(f), it provided no evidentiary support for its position. Although the court compared Apple’s arguments to Zeroclick’s objections, Judge Tigar did not point to any record evidence supporting the ultimate conclusion on Section 112(f) grounds.

In Praxair Distribution v. Mallinckrodt Hospital Products, Praxair petitioned for inter partes review of claims 1-19 of the ’112 patent, which the Board instituted. The Board held that claims 1-8 and 10-19 would have been obvious over four prior art references. However, claim 9 survived. Praxair appealed from the Board’s decision regarding claim 9, and Mallinckrodt cross-appealed regarding claims 1-8 and 10-11. The Federal Circuit affirmed the Board’s decision holding claims 1-8 and 10 unpatentable as obvious. Judge Newman concurred in judgment of unpatentability of claims 1-11, but disagreed with the Court’s view of the “printed matter doctrine” and its application to “information” and “mental steps.”

Buried in the claim language, conditional limitations may be a vulnerability in an otherwise valuable claim. A conditional limitation is a claim feature that depends on a certain condition being present. For example, when or if condition X is present, feature Y is implemented or has effect. Without condition X, feature Y may be dormant or have no effect. Patent owners should be cognizant of possible conditional limitations implications because conditional limitations may affect claim validity and infringement as discussed below in the context of recent U.S. Patent Office and Federal Circuit cases. In Ex Parte Schulhauser, the Patent Trial and Appeal Board (“the Board”) held certain claims as unpatentable based on conditional limitations.

One promising approach is to argue that the claims are directed to a specific technological solution to a specific technological problem, as has been successful in the courts. But, even this may not be convincing, if argued in the abstract, because, after all, we are dealing with abstract ideas to begin with, and it is all too easy for an examiner to dismiss an abstract argument as “not convincing”. A concrete, bright line test can be constructed, which may sway an examiner (or appeal board, if the rejection is appealed). Articulate a specific technological problem that the claims solve or are directed to solving. Analyze the claim and cite some of the important claim limitations that are not present in the alleged abstract idea, and explain the significance of these claim limitations in terms of the technological problem and technological solution.