Imagine you are a patent troll, holding onto a portfolio of patents you can only assert against a handful of companies. At some point, you start running out of victims. So why not invent some more?
That’s what a group of companies with names like AccNum, AllLed, AdzPro, CalNeb, ChaPac, FanPar, FasLan, FulNer, GosNel, and HunLos do. They send out copies of a letter like this to small companies:
Apparently, something like 18% of companies that receive the letter do actually pay, according to Ars Technica. Why? Fear, I guess. And as Ars points out, invalidating these almost-certainly-invalid patents would be difficult or impossible, and would definitely be expensive. Similar to debt collectors sending thousands of robo-signed demand letters at a time, these patent trolls have found a sort of loophole in the system that allows them to engage in a sort of legalized extortion.