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| (Source: Corning) |
China-based Caihong Display Devices has filed inter partes review petitions at the Patent Trial and Appeal Board targeting four patents held by Corning Inc.
The challenged patents—U.S. Patent Nos. 7,851,394; 8,640,498; 8,642,491; and 9,512,025—are among those asserted by Corning in its Section 337 complaint filed with the U.S. International Trade Commission in late 2024 and early 2025. In that complaint, Corning accused Caihong and several downstream panel and television manufacturers of infringing its LCD glass substrate technology.
Caihong submitted its IPR petitions between January 13 and May 22, 2025. The four patents overlap with five cited in Corning's ITC case: U.S. Patent Nos. 7,851,394; 8,627,684; 9,512,025; 8,642,491; and 8,640,498. The remaining unchallenged patent, No. 8,627,684, may also face an IPR filing in the near future.
Other companies named as respondents in Corning's ITC complaint include Hisense, HKC, LG Electronics, Vizio, and TCL CSOT, which Corning alleges are using infringing substrates sourced from Caihong.
The dispute has also expanded to Europe. In December 2024, Corning filed patent infringement lawsuits against LG Electronics, TCL, and Hisense based on European Patent No. EP 3296274 B1. That patent was subsequently challenged in a revocation action by TCL in April 2025.
By PatenTrip
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