The European Patent Office (EPO) ruled to uphold one of Universal Display`s key PHOLED patents (EPO#EP1394870). This patent, which UDC refers to as EP870, details an OLED in which the emissive layer contains phosphorescent dopant compounds. This patent corresponds to the company`s US`238 patent.

In November 2013, the Japanese High Court decided to validate UDC`s claims in Japanese patent #4511024, which is a counterpart patent to the EP870 and US238 patents. Later in November, The EPO revoked one of UDC`s basic phosphorescent OLED patents, EPO#1449238. The opposing parties included Sumitomo Chemical, Merck and BASF. (Source oled-info.com)