Letter-on-serial-petitions-to-Sens.-Tillis-and-Coons-and-Dir.-Iancu-05-03-19-1a53a0122c7584a85d6a7b2d64e85a53 Letter on Serial Petitions to Sen. Tillis and Sen. Coons in response to Director Iancu of the U.S. Patent and Trademark Office (PTO).