...use of and symbolized by the mark. 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 (3) months after the date thereof or prior to such subsequent purchase....

...application for registration has been or may be filed Is transferred by an instrument in writing. As assignment, grant, or conveyance shall be void as against any subsequent purchaser or mortgagee for valuable consideration without notice, unless It is recorded In the Office of the Administrator within...

...Act currently provides for a three-month lookback period; ie, an assignment, grant or conveyance is void as against any subsequent purchaser or mortgagee...consideration, without notice, unless it is recorded in the PTOwithin three (3) months from its date or at any time prior to the subsequent purchase or mortgage....

...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....

...under seal is prima facie evidence of the execution of an assignment, grant, or conveyance and that: "An assignment, grant, or conveyance shall be void...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...

...evidence of the execution of an assignment, grant, or conveyance of a patent or application for patent. An assignment, grant, or conveyance shall be void...against any subsequent purchaser or mortgagee for valuable consideration, without notice, unless it is recorded in the Patent and Trademark Office within...

...the othce of the Librarian of Congress within sixty days from execution. ' ' In default of which it shall be void as against any subsequent purchaser...mortgagee for a valuable consideration, without notice.' ' The fee for this record and certificate is $1, and for a certified copy of any record of assignment...

...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....

...the PTO to perfect it. For support, the trustee looked to the language in 35 USC § 261 stating that, "[A]n assignment, grant or conveyance shall be void...without notice, unless it is recorded in the Patent and Trademark Office. . . ." The Ninth Circuit engaged in a lengthy analysis of the 19th century interpretation...

...within six months after its execution without (lie limits of the United States, in default of which it shall be void as against any subsequent purchaser...mortgagee for a valuable consideration without notice, whose assignment has been duly recorded." As with the 1870 Act, courts interpreted the recordation...