Unreported / Non-Citable
Background
LED Wafer Solutions initiated patent infringement litigation against Samsung Electronics in March 2021 in the Western District of Texas, asserting U.S. Patents 8,952,405 and 9,786,822. Seoul Semiconductor Co. was joined, and the case was transferred to the Northern District of California (NDCA) in August 2022. The case was stayed from April 2023 to August 2024 pending ex parte reexamination (EPR) of the patents-in-suit.
During EPR, all claims asserted in the NDCA action were canceled or amended. LED Wafer sought leave to amend its complaint to include newly issued post-EPR claims but that motion was administratively terminated before September 2025. LED Wafer then filed this action in the Eastern District of Texas on September 15, 2025, asserting the newly amended claims. On January 7, 2026, LED Wafer moved to voluntarily dismiss the NDCA action, which was granted on June 16, 2026, dismissing without prejudice all claims on the ‘405 and ‘822 patents.
Samsung Electronics and Samsung Austin Semiconductor (SAS) moved to dismiss this new Eastern District suit on two independent grounds: (1) improper claim splitting because related litigation was pending when this suit was filed, and (2) improper venue as to SAS, a Delaware subsidiary with no alleged presence in Texas.
The Court’s Holding
The court denied Samsung’s claim-splitting argument. Although claim splitting typically prohibits a second complaint alleging the same cause of action as a prior pending action, the NDCA action was no longer pending at the time of this ruling and was based on patent claims that had been canceled during EPR. The Federal Circuit has established that when patent claims are canceled, the patentee loses any cause of action based on those claims and any pending litigation asserting them becomes moot. Accordingly, this second action asserts claims that did not exist in the first litigation.
However, the court granted Samsung’s venue challenge as to SAS. While applying Fifth Circuit law on corporate alter-ego piercing—the test for imputing venue from subsidiary to parent—the court found insufficient basis for disregarding SAS’s separate corporate existence. Though Samsung Electronics owns 100% of SAS, established it as its first U.S. semiconductor facility in 1996, invested $18 billion in it, shares one director with it, includes it in consolidated financial statements, and refers to it under the “Samsung” brand, these factors alone do not meet the demanding standard requiring that “the lines between the entities become ‘so blurred that the two become one.'” The Fifth Circuit maintains that even complete ownership combined with common directors and officers is an insufficient basis for veil-piercing. The complaint was dismissed without prejudice as to SAS.
Key Takeaways
- Patent claims canceled during ex parte reexamination become moot and eliminate the underlying cause of action, preventing claim-splitting dismissals when new claims are asserted in separate litigation
- Corporate alter-ego doctrine for venue purposes requires a showing that corporate lines are thoroughly blurred; common ownership, shared directors, and common branding are insufficient without additional evidence of failure to maintain separateness
- Federal Circuit precedent on mootness following claim cancellation provides an exception to traditional claim-splitting doctrine when the original litigation involved canceled claims
- Dismissal as to SAS was without prejudice, preserving LED Wafer’s ability to refile claims against the subsidiary if venue can be established
Why It Matters
This decision clarifies the procedural mechanics of patent litigation following ex parte reexamination. Patent owners whose claims are canceled or significantly amended during EPR face difficult tactical choices: they may not reliably continue pending litigation on claims that have changed or been canceled, and new litigation on newly amended claims will not be barred by claim-splitting doctrine. The decision provides important guidance that reexamination-driven changes in patent scope do not foreclose subsequent litigation based on newly available claims.
The venue holding reinforces substantial protection for corporate subsidiaries’ separate legal status. Subsidiaries cannot easily be joined simply because a parent company owns them, finances them, or uses the parent brand—a principle important for multinational corporations with diverse subsidiaries. The court’s emphasis on the Fifth Circuit’s requirement that “lines become so blurred that two become one” sets a high bar, ensuring that mere organizational relationships and financial connections do not override formal corporate separation or jurisdictional boundaries.