LED technology

Linklaters wins again for Seoul Semiconductor in LED dispute

South Korean LED manufacturer Seoul Semiconductor has won its next round of lawsuits against a competitor. In early August, Düsseldorf Regional Court ruled that Texas-based Mouser Electronics has infringed a utility model owned by Seoul Semiconductor (case ID: 4a O 49/17). Mouser distributes LEDs from manufacturer Everlight.

13 August 2019 by Mathieu Klos

Seoul Semiconductor, Mouser Electronics, LED Seoul Semiconductor wins again, this time against Mouser Electronics ©Qyzz/ADOBE STOCK

The dispute between Seoul Semiconductor, Mouser and Taiwanese company Everlight concerns LED technology, in particular thermal regulation. Seoul Semiconductor’s utility model protects an electronic mirror that improves light extraction in the LEDs (DE 20/2011110910). The utility model was confirmed in April.

The Düsseldorf judges found that Mouser infringed the technology. Mouser may no longer sell the affected products and must recall any products already delivered. In addition, the court ordered the distributor to render accounts and information to Seoul Semiconductor.

Seoul Semiconductor has not yet enforced the judgment. Mouser can appeal.

Year after year

For several years, a bitter feud between various manufacturers has plagued the LED manufacturing industry. A global dispute between Japanese chemical engineering company Nichia and Everlight has played out before numerous courts.

The present case between Everlight and Seoul Semiconductor is also part of a larger cross-border dispute between the South Korean company and its two competitors. The dispute made its way to Germany in 2017. Litigation proceedings soon followed.

In March 2017, Seoul Semiconductor filed an infringement suit against Mouser. This was upheld by Düsseldorf Regional Court last December (case ID: 4a O 37/17). But Mouser has already appealed this decision.

Julia Schönbohm, Linklaters, Frankfurt, patent litigation

Julia Schönbohm

The current case over the utility model went to court shortly after the first suit was filed.

In spring 2017, Everlight filed two lawsuits at Mannheim Regional Court against Seoul Semiconductor (case ID: 2 O 86/17) and its German distributor Neumüller Elektronik (case ID: 7 O 127/17), alleging infringement of Everlight’s patent EP 1169735. The patent protects a special casing designed to remove heat generated by LEDs.

However, Mannheim Regional Court ruled last December that Seoul Semiconductor did not infringe the patent. Everlight did not appeal the judgments.

Both sides filed reciprocal claims before the German Federal Patent Court in response to the suits. The claims are still pending.

According to JUVE Patent information, Seoul Semiconductor has now filed three further lawsuits against LED distributors at the Regional Courts of Düsseldorf and Mannheim based on four different intellectual property rights.

Similarly, there are parallel proceedings in China, Japan, Korea, the United States and Italy. Mutual consent led to the settling of a case before the UK High Court. Everlight also owned a British patent which has now been revoked.

Change of counsel

Seoul Semiconductor is a key client for the young patent practice around Linklaters partner Julia Schönbohm in Frankfurt. Schönbohm moved from DLA Piper to Linklaters at the end of 2014 to rebuild the firm’s patent practice.

Oliver Jüngst, Bird & Bird, patent litigation

Oliver Jüngst

Mouser has retained Bird & Bird for patent lawsuits in the past. Recently, Düsseldorf partner Oliver Jüngst took the lead. Jüngst was supported by Florian Schmidt-Bogatzky, who moved to the Düsseldorf branch of UK patent law firm EIP at the beginning of August.

The patent attorneys at Munich patent law firm Frohwitter advised Mouser. Furthermore, the firm is advising Everlight in the parallel disputes.

Originally, Everlight filed its two lawsuits with Quinn Emanuel Urquhart & Sullivan and Frohwitter. However, Everlight changed counsel shortly after and entrusted the proceedings to Hogan Lovells partner Clemens Plassmann. He has defended Everlight in other infringement proceedings.

Furthermore, Quinn Emanuel continues to advise Everlight in proceedings against Nichia. In the past, the Taiwanese company has also retained Hoyng ROKH Monegier in Germany.

For Seoul Semiconductor
Linklaters (Frankfurt): Julia Schönbohm (lead); managing associates: Bolko Ehlgen
Schneiders & Behrendt (Bochum): Olaf Isfort (patent attorney)

For Mouser
Bird & Bird (Düsseldorf): Oliver Jüngst; counsel: Florian Schmidt-Bogatzky
Frohwitter (Munich): Edward Tomlinson, Mathias Himmelsbach (both patent attorneys)

Regional Court Düsseldorf, 4a Civil Chamber
Tim Crummenerl (presiding judge), Carsten Haase, Jule Schumacher