...prima facie evidence of execution. An assignment shall be void as against any subsequent purchaser for a valuable consideration without notice. unless it is recorded in the Patent and Trademark Office within three months after the date thereof or prior to such subsequent purchase....

...accompanied by the full legal fee for recording. An assignment, grant, or conveyance of a patent will be void as against any subsequent purchaser or mortgagee for a valuable con47367°— 31 2 7 sideration without notice unless recorded in the Patent Office •within three...

...specifically addresses the issue of timely recordal of assignment documentation.128 The Patent Act states, An assignment, grant or conveyance shall be...without notice, unless it is recorded in the Patent and Trademark Office within three months from its date or prior to the date of such subsequent purchase...

...(b). (d) Recordation of Transfer. - An assignment, grant, conveyance, or mortgage under subsection (b) shall be void as against any subsequent purchaser or mortgagee for a valuable consideration, unless it is recorded in the Office of the Administrator within 3 months after its date of execution...

..."(d) RECORDATION OF TRANSFER. — An assignment, grant, conveyance, or mortgage under subsection (b) shall be void as against any subsequent purchaser or mortgagee for a valuable consideration, unless it is recorded in the Office of the Administrator within 3 months after its date of execution...

...exclusive right under his patent to the whole or any specified part of the United States ; and said assignment, grant, or conveyance shall be void as...Office within three months from the date thereof." § 181. The provisions of the statute in respect to recording the conveyances by which an interest...