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Patent practitioners scramble to make sense of latest rulings from USPTO

By Nick Robertson and Melissa Ritti ( June 16, 2025, 20:59 GMT | Comment) -- A set of recent decisions by US Patent and Trademark Office Acting Director Coke Morgan Stewart are shaking up practitioners’ long-held ideas of how inter partes review petitions are handled by the Patent Trial and Appeal Board. One appears to open the door for patent owners to invoke assignor estoppel to fend off challenges, while another arguably upends the foundational premise that patent claims obtained by fraud are unenforceable.US Patent and Trademark Office Acting Director Coke Morgan Stewart last week continued her expansion of the grounds under which inter partes review, or IPR, petitions can be discretionarily denied at the Patent Trial and Appeal Board....

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