ALEXANDRIA, Va., May 19 -- United States Patent no. 12,634,539, issued on May 19, was assigned to The Nielsen Co. (US) LLC (New York).

"Methods and apparatus to correlate census measurement data with panel data" was invented by F. Gavin McMillan (Tarpon Springs, Fla.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Methods, apparatus, and systems are disclosed to correlate census measurement data with panel data. An example system includes accessing means to access a message sent from a requesting device in response to accessing media that includes a tag causing the requesting device to send the message to a monitoring entity with an identification of a geographic location of the requesting device and media id...