The Patent Trial and Appeal Board (PTAB) of the United States Patent and Trademark Office (USPTO) has declined to initiate Inter Partes Review (IPR) of all patents asserted by Vicor Corporation in its complaint against Delta Electronics (Delta). The decision follows an ITC investigation into power converter modules allegedly infringing Vicor’s patents. Delta had attempted to challenge the validity of the patents through IPR petitions, but the PTAB concluded that Delta was unlikely to succeed in its challenges. The patents in question cover innovative technologies in power conversion, including digital control of switching resonant power converters, non-isolated, fixed-ratio bus converters, and power converters designed for symmetrical heat distribution. Vicor’s CEO, Dr. Patrizio Vinciarelli, hailed the PTAB’s decision, stating that it debunks expert opinions proffered by Delta in its attempts to invalidate Vicor patents.