Chrimar Systems, Inc. v. Ruckus Wireless Inc.

Background

Chrimar Systems, Inc. and Chrimar Holding Company LLC sued Juniper Networks Inc., Ruckus Wireless Inc., Netgear Inc., and Fortinet Inc. in four patent-infringement actions. The complaints asserted four patents concerning Ethernet connection technology, including U.S. Patent Nos. 8,902,760 and 9,812,825.

The actions were transferred to the Northern District of California and stayed while the Patent Trial and Appeal Board considered inter partes review petitions concerning the ’760 patent. During that period, a separate reexamination amended several claims, including claims 73 and 145, and found those amended claims patentable. The Patent Trial and Appeal Board later found the original claims 73 and 145 obvious in light of prior art. The Federal Circuit affirmed that decision, and the Supreme Court denied Chrimar’s petition seeking review.

Chrimar later asserted amended claim 145 of the ’760 patent, including through a claim combination identified as claim 97+145. Chrimar also asserted the ’825 patent for the first time in its third amended complaint. Before that filing, Chrimar had sent letters to counsel for the defendants stating that identified products infringed at least one claim of the ’825 patent. The letters listed 98 Juniper products, 70 Netgear products, 47 Fortinet products, and 32 Ruckus products. The ’825 patent expired on May 23, 2019.

The court had already dismissed Chrimar’s cause of action concerning the ’107 patent with prejudice. The motions decided in this order concerned the ’760 and ’825 patents.

Legal standard

The court applied Rule 56’s summary-judgment standard. Summary judgment is appropriate when the evidence shows no genuine dispute about a fact that could affect the result and the moving party is entitled to judgment under the law. The court must view the evidence favorably to the party opposing the motion, but speculation and conclusory testimony are not enough to require a trial.

The ’760 patent

The defendants argued that issue preclusion—also called collateral estoppel, a rule preventing a party from relitigating an issue already decided—barred Chrimar from contesting amended claim 145’s validity. The court explained that the relevant requirements included a final judgment on the merits, the same party or a party in legal privity in both proceedings, and an identical issue.

The court found those requirements satisfied. The Patent Trial and Appeal Board had decided the validity issue within its authority, its decision was affirmed by the Federal Circuit, and Chrimar had participated in that proceeding. Although the earlier proceeding addressed the original version of claim 145, the court held that the differences in the amended claim did not materially change the invalidity question. The amended claim no longer depended on claims 101 through 103 and depended on an amended claim 73 that added a BaseT Ethernet hub limitation. The court concluded that these differences did not materially alter the subject matter or the invalidity analysis, particularly because the prior-art reference Hunter had been found to disclose the added hub limitation.

The court therefore held that Chrimar was precluded from relitigating the validity of the ’760 patent and granted the defendants’ motion for summary judgment concerning that patent.

The ’825 patent

Under 35 U.S.C. § 287, a patent owner seeking infringement damages must provide notice of infringement, either through product marking or actual notice. Actual notice requires an affirmative communication identifying a specific infringement charge involving a specific accused product or device.

Chrimar relied on its letters to the defendants’ counsel. The court agreed that the letters identified the ’825 patent, but held that they did not identify the alleged infringement with sufficient specificity. The letters broadly asserted that each listed product infringed at least one of the patent’s 68 claims, without explaining which claims applied to which products or why the products were believed to infringe. The court calculated that the letter concerning 98 products and 68 claims left defendants to consider 6,664 possible product-and-claim combinations.

The court held that this “shotgun approach” shifted the notice burden to the accused parties and failed to provide actual notice. It further held that Chrimar could not obtain an injunction against infringement of an expired patent. As a result, the court ruled that Chrimar was not entitled to damages under Section 287 because of the lack of notice or to injunctive relief because the patent had expired. The court granted the defendants’ motion for summary judgment concerning the ’825 patent.

Disposition

Judge Susan Illston granted both defendants’ motions for summary judgment. Specifically, the court granted the motion concerning the ’760 patent and granted the motion concerning the ’825 patent.