Considering this has been updated to reflect the more than 40 licenses to date, it appears as thought the magic number of "on-notice" companies is at above 300:

Licensing Potential and Success: More than 300 companies using microprocessor technology in products they make or market have been put on notice that they are likely candidates for licensing the technology covered by the MMP portfolio. As of February 2008, more than 40 well-known companies have purchased licenses, including such names as Intel, AMD, Hewlett Packard, Sony, Nokia, DirecTV, Fujitsu, Casio, Seiko-Epson, Nikon, Pentax, Olympus, Mattel, Bull, Sharp, Schneider Electric, NEC, Funai, SanDisk, Lexmark, Kenwood, and others.