I have updated my grant-rate chart from a prior post. For these figures, I obtained a set of 15,900 published patent applications and categorized each application according to its area of technology and also as either patented, abandoned, or still pending. The chart below shows both the grant rate (percentage of applications that have been patented) and also the still in-process rate (percentage of applications that are still in-process).
My sample of applications are a random set of published applications with filing years of 2004 through 2010. About 94% of these cases have been concluded (either patented or abandoned) and my original chart did not include the in-process numbers which, for most areas-of-technology are fairly minimal. However, on reflection, I went back and looked at these figures and found that they are important.
Notably, the eCommerce arts appear to have a low grant rate. However, a substantial percentage of applications in that area are still pending. It is almost certain that some of those still-pending applications will issue as patents and the final grant rate for the area will be higher than originally predicted.