"Creating" a new design that you can sell to a company is kind of a long shot, unless you have a degree in engineering, and/or a fair amount of experience with refrigeration concepts to begin with.
I am a pretty smart guy (Jet eng mech on F-16's, R&D tech on small jet engines at William International, Mech at Ford and Gm proving grounds) and hired a pro freind a few years back to build a system for me/with me (It was a monster, One CPU, and dual GPU coolers in one...I used a truck toolbox to fit ti all in!) and I had trouble following everything he showed me at times. I can't imagine anything you would be able to add if your a novice.
I am not saying it CAN't be done, but even if you do, getting a company to buy it is going to be rather difficult unless you found a way to mass produce something that can hit -60c for under 300$!!!!
Here are a few newer products on the scene for you too look at, and you will see what you are up against.
OCZ has been working on a project like this for 3-4 years (For around 400$) and when it was finally released, failed to set the world on fire due too poor quality. Thermaltake has one now too, it is kinda expensive but does come with a case.
http://www.tweaktown.com/reviews/1321/ocz_cryo_z_phase_change_cooler/index.html
http://www.techpowerup.com/72005/Th...AR_RCS100_Phase-Change_Processor_Cooling.html
http://www.xpressar.com/index.html
Companies want to make money, and Phase Change cooling is a very niche product to begin with..don't expect to become rich even if you did find a way to be succesfull, there just isn't a huge demand for something like that, compared to a higher volume product such as a CPU waterblock or air cooler.
I know the feeling of being out of work, I have been jobless for a while too and have tried variuos ideas over the years with the same hopes..but you might want to look into something else to make money, something that does not require the huge amout of expertise you would need to pull something like this off.
Around 2004 for example, I used a 300MM server fan on the side panel of my case for extreme air cooling, and it worked great, but I failed to find a way to get it to market...now you can buy cases with 250mm side panel fans all day long. Somone saw it at my old website and copied it and beat me to market. My point is, don't give up on coming up with something, just you might want to look at something other then phase change...unless you know a hell of alot about it allready, and have some unique way of doing it in mind allready that isn't being done now.
Just trying to save you a bit of heartache bubba...been there and done that