The double white patent that DiMarzio holds is only for the US afaik. So BKP, for instance, can sell double white PAFs.
I'm surprised that Gibson take this one lying down to be honest - they can PROVE prior art, which would invalidate the patent.
Dimarzio claimed to have done it first when he filed his patent - however he may have "fibbed"
Applies only to double cream coils not double white and patent only really applies in USA
Similar things have happened before and since I'm sure...
A good example is that prior to selling BC Rich to another company(HHI holdings) Bernie Rico claimed he personally designed
ALL the guitars in their range - however the Bich was a Neal Moser design (as was the Virgin), The Stealth was a Rick Derringer design.
But HHI has sent quite a few legal letters (of the "cease and desist" type) based on this misinformation and Bernie has sadly died so nobody can challenge what he claimed now