How to bypass reception and pitch directly to the right people at a big corporation.

As you may know from my introduction post I'm working on licensing a patent to a big corporation. One of the problems I've found is that it's hard to get the email address or speak directly to the right people (I.e. Head of marketing etc...). You can try calling but many times people won't let you through or give out email addresses. I've actually tried this technique that Stephen Key gives in this short video on Licensing. I thought it may be helpful for other inventors out there. I hope it helps.