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US PTAB blocks shortcuts, raises questions with new ‘general knowledge’ memo

By Nick Robertson ( August 8, 2025, 15:00 GMT | Comment) -- A memo last week to the Patent Trial and Appeal Board specifying that petitioners for inter partes review must link all challenged limitations to prior art, without relying on expert testimony or “general knowledge,” ensures that attorneys will stick to best practices, practitioners told MLex.Strict enforcement of Rule 104(b)(4) at the Patent Trial and Appeal Board, as ordered in a new memo by US Patent and Trademark Office Acting Director Coke Morgan Stewart last week, may not significantly change the workflows of many patent practitioners, but the memorandum still raises concerns over gray areas in the text....

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