a patent cost apx 6,000.00 by the time you actually get it 5 years after the application is submitted.
also patents are available free of charge to look at.
a patent only prevents someone from building and selling the pattented device , not someone who just wants to build one and use it himself.
also a ploy that big buisness uses is to take other peoples ideas and change a few things and then pattent the persons ideas themselves.
funny that the pressure exchanger in the california de-salination plants opperate on centrifugal force for stepping up the pressures involved rather than using pistons to do this.
it seems that someone somehow figured out that rotating water will increase in pressure as long as it does not save any energy or make any energy.
although by using the pressure exchanger the 40% lost energy in pressure form has been reclaimed to run or power the pressure exchanger and filter
more water.
resulting in a 98% efficient process.
I can only assume that the pump used to supply the initial pressure to the filter has a normal 20% energy loss and the pressure exchanger has recovered 18% of this loss.
