Here are the various DiMarzio patent numbers:

-Dual Resonance: 4,501,185
-Airbucker: 5,399,802
-Virtual Vintage: 5,908,998
-Stack design (e.g. HS-3): 4,442,749

there are also 2 other patent numbers that I'm not sure about:

-5,908,802 - found on the Virtual Solo & Virtual '54 Pro - could be either a mistake on the DiMarzio site (maybe they meant the VV technology - 5,908,998), or they used someone else's patent on that pickup (if you look it up, it shows that it's a patent issued by some other company)

-5,811,710 - found on the VV Solo, Solo Pro, Blues - I guess it's again the stack design in slight variation