That is very interesting. Having been issued a few patents on this subject myself, I have studied a multitude of other patents. It is amazing just how many patents where filed for and/or issued to try and solve the problem of cycling pumps to death. I have a file with literally hundreds of patents, all trying to solve this problem. At the very least it shows just how big a problem cycling is to the life of pumps.
However, just because you have a patent on a device that will solve the problem of pump cycling, doesn't mean it will quickly become common place in the industry. To the contrary, a product that actually solves the problem like a CSV, is considered a disruptive product and is shunned by many in the industry. This is similar to someone inventing a mousetrap that works so well it would make mice extinct. While they may say it is a good idea, people who sell mousetraps will do everything in their power to discredit it or even buy the patent for the sole purpose of disposing of it. It would be disruptive to the mousetrap industry to actually let mice go extinct. People in the mousetrap industry will do everything they can to keep an invention like that from being used, the same way people in the pump industry are doing everything they can to keep people from using a CSV.
I have a device called the Cycle Sensor which will do the same thing as the device in the above patent. The difference is the Cycle Sensor is not attached to the tank or water line in anyway. Yet it will still shut the pump off, just as this device will, when the air volume in the tank is reduced causing the pump to cycle. All you do is set it to the run time it takes to fill the pressure tank when the air volume in the tank is correct. So if you have a pump/tank setup that gives 1 minute of run time to fill the tank, you set the Rapid Cycle feature of the Cycle Sensor for 50 seconds. This is a good way to make sure the air charge in a bladder or a standard tank is always maintained properly. If the air volume in the tank is decreased or there is any other reason the pump does not run for at least 50 seconds, the Cycle Sensor will shut the pump off and say RCYC for rapid cycle as seen in the following picture, before the motor is damaged from cycling.