If you are trying to sell an idea..be it a design, patent, trademark...it could require a lot of cold calling to try to get the appropriate contact/company to hear you out and consider to take your idea on. They get a lot of these types of calls a day, so it can be very difficult to get noticed.
Not saying you can`t do it, just trying to let you know what would be in store if you will try to license a company to sell your product and pay you royalties.
If you do end up getting a deal, it can be quite rewarding.
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Motivation for Entrepreneurs
Entre-Propel.com