you cannot patent anything that is considered "public knowledge"
so unless direct die cooling was patented a very long time ago, it is all rubbish. if you want to patent anything, you haev to be very careful not to tell anyone anything, once the provisional is through, you are safe.
but really who cares about a patent like that, protecting it would be damn near impossible. i am sure volenti jaydee etc are making their direct die blocks different enough from the original patents specs that they would be fine
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