Little Giant Ladder Systems, LLC v. Tricam Industries, Inc.

Background

The dispute involved United States Patent No. 10,767,416, referred to as the ’416 patent. Little Giant alleged that Tricam’s ladders infringed the patent. Tricam brought a counterclaim under the Federal Declaratory Judgment Act seeking a declaration that the ’416 patent was invalid.

On March 28, 2024, the court denied Little Giant’s motion for summary judgment and granted Tricam’s motion for summary judgment. The court determined that no reasonable jury could find that Tricam’s ladders had the “cavity” limitation in the ’416 patent’s sole independent claim. The court therefore found no infringement and treated the parties’ invalidity issues as moot. After the parties informed the court that the non-infringement ruling did not eliminate Tricam’s invalidity counterclaim, the court vacated the judgment and requested briefing on the proper disposition of that counterclaim.

Parties’ Positions

Little Giant asked the court to dismiss the invalidity counterclaim without prejudice so that judgment could be entered without further delay. Tricam argued that the court should decide the counterclaim because Little Giant had obtained United States Patent No. 11,788,351, the ’351 patent, and had informed Tricam that it believed Tricam’s same ladders infringed that patent.

Tricam argued that some claims in the ’351 patent had been drafted to address arguments made in the litigation over the ’416 patent. It also argued that a finding that the ’416 patent was invalid could prevent Little Giant from relitigating related invalidity issues in a future case involving the ’351 patent. The court noted that the parties disagreed about whether such a finding would have that effect.

Court’s Analysis

The court explained that the Declaratory Judgment Act gives district courts discretion to decline jurisdiction over declaratory-judgment claims, including an accused infringer’s counterclaim seeking a declaration of patent invalidity. A court may dismiss such a counterclaim without prejudice after finding non-infringement, particularly when the counterclaimant has not shown that deciding validity would provide an additional concrete benefit.

The court concluded that Tricam had not identified a current threat of liability under the ’416 patent apart from a possible appeal of the non-infringement ruling. Tricam instead relied on a possible benefit in a future, hypothetical dispute involving the different ’351 patent. The court found it uncertain whether an invalidity ruling concerning the ’416 patent would affect future litigation over the ’351 patent and declined to issue an advisory opinion on that question.

The court also considered judicial economy. It had already resolved the infringement issue in Tricam’s favor, while the invalidity issues involved written description, enablement, indefiniteness, anticipation, and obviousness. The court found those issues numerous and unsettled, and concluded that resolving them at that stage could waste judicial resources. The court noted that the parties could use the work already performed on invalidity if the case later returned after an appeal.

Rulings

The court modified its March 28, 2024 summary-judgment order and ordered judgment to be entered as follows:

- Little Giant’s motion for summary judgment was denied. The court denied the motion on the merits as to whether Tricam’s ladders infringed the ’416 patent’s cavity limitation literally or under the doctrine of equivalents. The court did not address Little Giant’s invalidity arguments. - Tricam’s motion for summary judgment was granted. The court held that no reasonable jury could find literal infringement of the cavity limitation and that amendment-based estoppel prevented Little Giant from relying on the doctrine of equivalents for that limitation. The court did not address Tricam’s invalidity arguments. - Tricam’s motion to exclude Fred Smith’s expert testimony was granted in part. The court excluded Smith’s opinions about infringement of the cavity limitation because he did not apply the court’s claim construction. - Tricam’s counterclaim seeking a declaration that the ’416 patent was invalid was dismissed without prejudice, in the court’s discretion.

The court’s order resolved the infringement issue but did not decide whether the ’416 patent was invalid.