Canadian Solar Prevails in Patent Dispute Against Maxeon Solar Technologies

On January 15, 2026, Canadian Solar Inc., based in Kitchener, Ontario, announced a significant legal victory against Singapore-based Maxeon Solar Technologies. The U.S. Patent Trial and Appeal Board (PTAB) ruled in favor of Canadian Solar, invalidating all claims made by Maxeon regarding alleged patent infringement related to Canadian Solar's TOPCon solar cell technology. Following the announcement, shares of Canadian Solar rose by 5.2%, while Maxeon's shares fell by 2.3%.

The Globe and Mail (Toronto)Canadian Solar wins patent infringement lawsuit against MaxeonReuters

The patent dispute began when Maxeon filed a lawsuit against Canadian Solar in the U.S. District Court for the Eastern District of Texas on March 25, 2024. Maxeon claimed that the fundamentals of the TOPCon technology were visible in its own patents dating back to the 2000s. At the time of the lawsuit, Maxeon asserted it held over 1,650 granted patents. This ruling marks a culmination of nearly two years of legal proceedings.

The Globe and Mail (Toronto)ReutersCanadian Solar wins U.S. patent litigation against Maxeon

Colin Parkin, president of Canadian Solar, emphasized the importance of the ruling, stating that it affirms the company's commitment to protecting intellectual property. He remarked, “The final decision issued by the USPTO once again affirms that Canadian Solar’s technology and legal teams have always respected and placed great importance on protecting both our own and our peers’ intellectual property.” Parkin also criticized the misuse of patents that lack practical value, which he believes can distort competition and hinder innovation.

Canadian Solar wins patent infringement lawsuit against Maxeon

In response to the ruling, Maxeon expressed its intention to evaluate the decision and consider an appeal. A spokesperson stated, “We believe we have credible legal grounds to seek reversal of the decision, and of note is the fact that the USPTO’s ruling upheld the validity of one of our TOPCon patent claims.” Maxeon affirmed its commitment to defending its intellectual property rights and indicated that this ruling would not alter its long-term strategy.

Canadian Solar wins patent infringement lawsuit against MaxeonReutersThe Globe and Mail (Toronto)

This ruling not only impacts the competitive landscape between Canadian Solar and Maxeon but also reflects broader issues within the solar industry regarding patent rights and innovation. Canadian Solar's victory is seen as a reinforcement of its technological foundation and legal capabilities, having filed over 5,000 patent applications since its inception in 2001, with an acceptance rate of approximately 80%.

Canadian Solar wins patent infringement lawsuit against MaxeonCanadian Solar wins U.S. patent litigation against MaxeonThe Globe and Mail (Toronto)

While Canadian Solar celebrates its victory, the ongoing legal dynamics suggest that the dispute may not be fully resolved. Maxeon's assertion that part of its patent claims were upheld indicates potential complexities in the legal interpretations of the patents involved. Further developments are anticipated as Maxeon considers its options for appeal.

The Globe and Mail (Toronto)ReutersCanadian Solar wins patent infringement lawsuit against Maxeon

• “ “The final decision issued by the USPTO once again affirms that Canadian Solar’s technology and legal teams have always respected and placed great importance on protecting both our own and our peers’ intellectual property.” — Colin Parkin, President, Canadian Solar

Canadian Solar wins U.S. patent litigation against Maxeon

• “We believe we have credible legal grounds to seek reversal of the decision, and of note is the fact that the USPTO’s ruling upheld the validity of one of our TOPCon patent claims.” — Maxeon Solar Technologies Spokesperson

Canadian Solar wins patent infringement lawsuit against Maxeon