Yes, Sphere technology is patented and only available from Townsend Labs. You can read the patent here:
We also hold a patent that describes a device, system, and method for modeling microphones and a microphone sound-isolation baffle that can be used with microphone modeling. Parts of this new patent will find their implementation in a forthcoming, free update of the Sphere plug-in, the software counterpart to the award-winning Sphere L22 microphone.
You can read this patent here: https://patents.google.com/patent/US10701481B2