PTAB Ruling Prompts Appeal

The PTAB issued a final written decision in the post-grant review case, and YMTC has since announced it does not accept the outcome and will continue the dispute through the appeals process. The company indicated that the scope of patents being contested has grown to 15 at the appeals stage, up from the earlier round of proceedings.

The PTAB's decision document, available through the board's public docket, forms the basis of the current state of the case. YMTC also published materials related to the matter on its website.

What Remains Unclear

The specific identity of the opposing party and the detailed outcomes for each of the 15 patents were not spelled out in the materials reviewed. It remains unconfirmed how many of the challenged claims were found invalid versus upheld, and no timeline for the appeals process has been stated.

YMTC, one of China's leading 3D NAND semiconductor makers, has been involved in extensive patent litigation with international memory rivals in recent years, making the outcome of the appeal closely watched across the memory industry.

The claim that YMTC is refusing to accept the patent invalidity ruling and expanding to 15 patents on appeal is Mostly True.