Patriot Scientific

Is there a "rule of thumb" for an offer per share based on the current SP and it's trading range as a function of time? What worries me is the possiblity that if the SP can be held down for a long enough period of time, then can that price be considered "acceptable " and an offer be based on it instead of a price that either is or is assumed to be a more realistic price based on projected earnings, intrinsic value etc.