I count 32 on Patriot's site.
http://www.ptsc.com/corporate/index.asp
The following companies have purchased licenses for one or more patents in the MMP portfolios:
- AMD
- Intel
- Hewlett Packard
- Fujitsu
- Casio
- Pentax
- Sony
- Seiko Epson
- Olympus
- Kenwood
- Nikon
- Nokia
- Lexmark
- Schneider Electric
- NEC
- Funai
- SanDisk
- Sharp
- Denso Wave
- Lego
- DMP Electronics
- Philips
- TEAC Corporation
- Daewoo Electronics
- Lite-On
- Alpine Electronics
- Humax
- Verigy
- Psion
- Tokyo Electron
- DIRECTV
- Mattel