How do I pitch ideas to large companies?
I don't mean to imply that either Sony or Microsoft are bad in this respect, but in my opinion the patent system is broken. Searching google for microsoft, patent litigation" yields more than 311,000 results. The search for "Sony, patent litigation" yields 118,000 results.
It would take high-powered business development skills to get you the right contacts, and high-powered legal to keep the know-how protected.