Finjan, LLC. v. Cisco Systems Inc.

Background

Finjan sued Cisco for allegedly infringing five patents involving computer and network security. The motion addressed the validity of asserted claims in U.S. Patent Nos. 8,677,494 and 6,154,844. Finjan sought summary judgment, a decision without a trial when the evidence shows no genuine dispute over an important fact, that those claims were valid as a matter of law.

Cisco had previously petitioned the Patent Trial and Appeal Board for inter partes review, an administrative process for challenging patent validity, based on certain prior-art references. The Board denied institution of review for both patents, meaning it did not begin those proceedings. Cisco later served expert reports in the district-court case presenting invalidity theories based on prior art.

Parties’ Arguments

Finjan argued that Cisco had used its strongest prior art in its review petitions. Because the Board declined to institute review, Finjan contended that no reasonable jury could find the patents invalid based on the supposedly weaker prior art Cisco asserted in the district-court litigation.

Cisco argued that Finjan was asking the court to create an estoppel, or legal bar, beyond the one Congress provided by statute. Cisco also maintained that its district-court invalidity theories differed from the theories considered by the Patent Trial and Appeal Board and that factual disputes remained.

Court’s Analysis

The court held that the statutory estoppel provision applies when an inter partes review results in a final written decision. Because the Board denied institution and issued no final written decision, the statutory estoppel did not apply to Cisco’s challenges. The court declined to create a broader estoppel based merely on the filing and denial of an unsuccessful review petition.

The court also stated that validity challenges brought by other parties in other proceedings did not create estoppel against Cisco. The statute applies to the review petitioner and certain related parties, not to unrelated parties absent the required relationship.

Finally, the court found that Finjan had not shown that Cisco’s invalidity theories were so weak that no reasonable jury could find the patents invalid. Finjan challenged some prior-art references individually without addressing the substance of Cisco’s various combinations and theories. The strength of those theories was therefore a material factual issue for trial.

Disposition

Judge Beth Labson Freeman denied Finjan’s motion for summary judgment of validity as to the asserted claims of the ’494 and ’844 patents. The order did not decide that the patents were invalid or finally resolve their validity; it left the disputed invalidity issues for trial.