For the internet vendors of the Quadrex repros, what's the deal/status with the design patent and others?

I'm sure there's several, JBL invested a lot of effort into the project.

There seems no issue with using the protected trade name of the inserts either, "Quadrex" for the purposes of marketing; the sculpted-foam folks use it in their headers:
NEW JBL L100 CENTURY QUADREX FOAM GRILLE INSERTS L-100

Too bad it's just us, desperate to find the missing parts; that header would be a winning law suit a couple times over (false advertising).

What's the deal today? Expired, they don't care (JBL/Harman), or do you have to get permission (sellers only).