Good point fatwollit but I'd suggest the reading is not of much value. Re your comment:

"1. But the level of uncertainty depends on whether the PTSC investor has read the reexam responses to the 584 and 148. Knowing what is contained in those responses, and understanding the technology behind the 336 vs prior art determines what each individual sees as risk. How many shareholders have done that? Therein perhaps lies a problem. And therein perhaps lies huge opportunity for some. "

IMO an investor's reading of those responses is not as valuable as their recognizing that every company that buys a licenses has had a legal review of all the issues related to all aspects of the patent licenses. The patent lawyers and legal staffs of large corporations are very knowledgeable technically and legally; and they have access to much more informatrion than an investor will. This is what makes PTSC's stock a buy.