Rule 91

91. Presentation of assignment, etc., of the patent to Controller.—

Every assignment and every other document giving effect to or being evidence of the transfer of a patent or affecting the proprietorship thereof or creating an interest therein as claimed in such application, shall, unless the Controller otherwise directs, be presented to him together with the application which shall be accompanied by two copies of the assignment or other document certified to be true copies by the applicant or his agent and the Controller may call for such other proof of title or written consent as he may require