The word from The Chemist:
This formulation is trying to create a solution which is a buffer that is trying to make a precise pH - just slightly alkaline. He says, "the phosphate ions, carbonate ions, and bicarbonate ions bind with free hydrogens in the water to allow hydroxides to accumulate." The buffer keeps the solution mildly alkaline as the hydroxides get used up (presumably in attaching themselves to grunge.)
The formula in the patent - the masses listed - will not result in the molar ratios in the patent. The resulting molar ratio is 1 to 1.68 to 1.28.
He can't guess whether we should target the recipe in the patent (the masses listed), or the molar ratio in the patent. He suggests trying both on cheap chips to see which works.
We can try the formula in the recipe (scaled down by 1/208 to make a one-liter batch) as a test of the 1 to 1.68 to 1.28 solution.... And try an alternate formula to create an actual 1 to 2.6 to 1.6 solution. For this, The Chemist recommends "4.36 g of sodium bicarbonate, 9.28 g of sodium carbonate, and 10.9 g of sodium phosphate combined with 1 liter of water. Heat the water gently and stir constantly." He's not sure it will all dissolve for either formulation.
This makes sense, given the method described in the patent:
In some embodiments of the present invention, it has additionally been found advantageous to formulate the present cleaning solution in a particular manner. Thus in some embodiments, the appropriate amount of sodium bicarbonate (SB) is added to deionized, softened or RO water and stirred until dissolved. While SB is known to be quite soluble in water, it has been found to be advantageous to add the SB to water that has been warmed to between 30 to 40 degrees Celsius (°C) to hasten dissolution. Once the SB is dissolved, the appropriate amount of sodium carbonate (SC) is added to the SB solution, again with stirring. Upon addition of the SC, it will be noted that a hazy solution is obtained, and that even after prolonged stirring, the solution does not become fully clear. Finally the appropriate amount of trisodium phosphate (TSP) is added to the mixture of SB and SC, again with stirring. It will be noted that after addition of the TSP, in a short time (a few minutes) the mixture becomes clear, denoting a true solution of the three components.
So, who's going to try?