A newly filed opposition in IPR2025-00677 puts a familiar but strategically important PTAB issue front and center: whether a patent owner’s proposed substitute claims can survive scrutiny when offered through a contingent motion to amend. In its April 7, 2026 filing, the petitioner asks the Patent Trial and Appeal Board to deny the patent owner’s amendment request, arguing that the revised claims still do not satisfy the governing patentability and procedural standards.

A contingent motion to amend is exactly what it sounds like: the patent owner proposes substitute claims only if the Board finds the original claims unpatentable.