Recently, the ITC issued its final determination in the Section 337 investigation concerning certain LCD glass substrates, confirming that relevant products from companies including Rainbow Co., Ltd., Xianyang Rainbow Optoelectronics, and TCL Huaxing Optoelectronics infringed on intellectual property rights, and issued a limited exclusion order and an injunction.
On August 6, 2026, the ITC issued an announcement stating that, following a reexamination, it had confirmed the existence of infringement in this case. It issued a limited exclusion order against the named defendants—Rainbow Display Devices Co., Ltd., Xianyang Rainbow Optoelectronics Technology Co., Ltd., TCL Huaxing Optoelectronics Technology Co., Ltd., and U.S.-based TTE Technology, Inc. (TCL North America)—covering infringing products exported to the United States, imported into the United States, and sold in the United States. At the same time, it issued a cease-and-desist order against TTE Technology. A 0% security deposit was imposed on infringing products imported during the presidential review period, and the investigation in this case was thereby terminated.
This ruling constitutes a partial review of the final preliminary determination issued on April 7, 2026. The review focused on whether the claim term “molecular percentage based on oxides” was sufficiently defined and whether the petitioner met the economic elements required for U.S. domestic industry status.
It is worth noting that during the investigation, several named respondents successively withdrew from the case through settlements: In August 2025, HKC Co., Ltd. and HKC Overseas reached a settlement; in September, VIZIO withdrew through a settlement; and in December, LG Electronics U.S.A. withdrew through a settlement. In April 2026, Hisense USA also had the investigation terminated based on a settlement.
Case Background:
Corning Inc. has initiated patent litigation against Chinese companies such as Rainbow Co., Ltd., TCL Huaxing Optoelectronics, and HKC in multiple jurisdictions, including the United States, the European Union, India, and China:
On January 31, 2025, Corning filed a petition with the ITC, alleging that nearly ten companies—including Rainbow Display Devices Co., Ltd., Xianyang Rainbow Optoelectronics Technology Co., Ltd., TCL Huaxing Optoelectronics Technology Co., Ltd., and Hike Co., Ltd.—had infringed on three of its glass batch patents, and requesting the issuance of a limited exclusion order and cease-and-desist order;
On March 3, 2025, the ITC formally initiated an investigation under case number 337-TA-1441;
On April 16, 2026, the Mannheim Regional Division of the UPC issued a first-instance judgment finding that TCL and other companies had infringed the patents;
On August 6, 2025, the ITC terminated its investigation into Hike Co., Ltd. and its Hong Kong affiliate, HKC Overseas Ltd., based on a settlement agreement;
On September 30, 2025, VIZIO, Inc. of the United States withdrew from the investigation following a settlement;
On November 26, 2025, Corning filed a motion with the ITC to withdraw all claims under U.S. Patent No. 7,851,394 and the infringement claim regarding claim 2 of U.S. Patent No. 8,642,491;
On December 8, 2025, LG Electronics (U.S.) resolved its involvement in the case through a settlement agreement;
On December 23, 2025, the ITC issued a final determination terminating the investigation into all claims of U.S. Patent No. 7,851,394 and claim 2 of U.S. Patent No. 8,642,491, based on Corning’s motion;
On April 7, 2026, the ITC Administrative Law Judge issued a Final Initial Determination (FID), finding that the “615” glass substrate from the material supplier infringed Corning’s patents;
On April 20, 2026, the ITC terminated the investigation against Hisense USA based on a settlement;
On June 8, 2026, the ITC decided to conduct a partial review of the Administrative Law Judge’s Final Initial Determination dated April 7;
On July 6, 2026, the ITC issued its final determination, partially granting Corning’s motion to delete the portions of the oral arguments by Rainbow Co. and Xianyang Rainbow relating to remedies, public interest, and security deposits; it denied Corning’s motion to delete the same content from TCL Huaxing Optoelectronics and TTE Technology;
On August 6, 2026, the ITC issued a partial final ruling under Section 337, confirming that infringement had occurred in this case and issuing a limited exclusion order.
