greg has raised several relevent points ...
span and chord do matter, it's called aspect ratio, and for your geometry the aspect ratio is 5.
all airfoils vary their Lift/Drag substantially with angle of attack, which i suspect is constant for your application.
reynold's number is an importantinput for airfoil selection. i suspect that in your case it's quite low, which isn't a problem, you just need to be aware of it.
why is the specific profile that important to your patent application ? surely the patent outlines an idea, the novel solution to a problem, the novel application of technology, without saying (necessarily) "using a NACA 0012 airfoil this patent does ..."; if you did then would could get around your patent by saying "using a NACA 0016 airfoil ..." no?
Research airfoil L/D ... incidence is important (constant though it may be) ... a NACA 0012has zero L/D at zero degrees (will it does in free stream aerodynamic situations, 'cause it's symetric and has zero lift at zero incidence; in ground effect the situation may be different) and something +ve at positive incidence.