(August 29, 2023, 1:35 PM EDT) -- ALEXANDRIA, Va. — In an Aug. 28 request for rehearing by the director of the U.S. Patent and Trademark Office of a denial one month earlier by the Patent Trial and Appeal Board of inter partes review (IPR) of a synthetic nicotine patent, a petitioner says the board should have applied an “obvious to try” standard in its assessment of a motivation to combine various prior art....