In MasterImage 3D, Inc. v. RealD Inc., IPR2015-00040, Paper 42 (PTAB July 15, 2015), the Patent Trial and Appeal Board (PTAB) discusses requirements for a patent owner seeking to establish the patentability of substitute claims in a motion to amend.
This is intended to clarify the patent owner's burden to set forth a prima
facie case of patentability of narrower substitute claims in a motion to
amend as described in Idle Free Systems, Inc. v Bergstrom, Inc., IPR2012-00027, Paper 26 (PTAB June 11, 2013)(informative).
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