Arex Industries, Inc. v. Diode Dynamics, LLC, et al.

Summary

The United States District Court for the Eastern District of Missouri ruled on Defendant Diode Dynamics, LLC’s motion to dismiss and Plaintiff Arex Industries, Inc.’s request for leave to amend. The court dismissed the patent infringement claim only insofar as it alleged infringement based on Gen 1 headlights, dismissed the Missouri Merchandising Practices Act claim without prejudice, and granted leave to amend the trade dress and common-law unfair competition claims. The court denied as moot the motion to dismiss those claims and directed Plaintiff to file an amended complaint by March 12, 2026.

Holdings

1. Count I was dismissed to the extent it alleged infringement based on Diode Dynamics's Generation 1 headlights, because plaintiff conceded that it did not seek relief based on those headlights and the patent issued only after Diode stopped selling them.
2. Count IV, the Missouri Merchandising Practices Act claim, was voluntarily dismissed without prejudice based on plaintiff's concession.
3. Leave to amend Counts II, III, and V was granted because none of the recognized reasons for denying amendment was present and defendant had not shown that the proposed amendments would be futile.

Questions Presented

1. Whether the patent-infringement claim should be dismissed to the extent it relied on Diode Dynamics's Generation 1 headlights.
2. Whether the Missouri Merchandising Practices Act claim should be dismissed without prejudice based on plaintiff's concession.
3. Whether plaintiff should be granted leave to amend its trade-dress and common-law unfair-competition claims.

Disposition

other