That appears like a good method.
This jogs my memory of Ford. For a very long time they owned the patent for heated entrance screens. This meant I used to be sat there in my BMW, Mercedes or Porsche, through the years, ready for the blowers/heaters/aircon to defrost or demist the automotive earlier than driving on a regular basis. It actually sucked, realizing {that a} low-end automotive could be prepared in a fraction of the time and all due to a patent. No sum of money was going to vary that.
I felt like Ford needs to be compelled to permit it on security grounds, even when they had been to be paid for it is use. I gave in finally and purchased a Jag and a Rangey due to this, so I suppose they obtained me, the buggers!
Finally, if somebody invents or perfects one thing and has the sense to patent it, I suppose it is smart they need to be capable of revenue from it. As you stated although, have unique rights for a interval after which open it up for others and see the profit by way of extra income quite than gross sales.