US patent N° 5,228,034, “Ring Communication network station”

US patent N° 5,487,073  “Test system for a very high-speed ring network and an operating procedure for the system”.

US patent N° 5,561,812, “Data transmission system for transferring data between a computer bus and a network using a plurality of command files to reduce interruption”

US Patent, N° 6,751,671.  "Method of communication between a user station and a network, in particular such as internet, and implementing architecture".

US Patent, N° 6,735,627. "System and method of smartcard for managing transmissions of multimedia data via the internet-type network, in particular telephone or videophone data between subscriber systems."