Get breaking Internet news straight to your desktop - click here to find out how Amazon.com has been granted three detailed patents covering purchase circles, consumer reviews, and search results in the form of products from multiple product categories. It's a sweeping landgrab which puts e-commerce rivals on the alert. The techniques granted to Amazon.com by the patent office are already ubiquitous on commercial and social networking web sites. Patent 6,963,848 filed March 2, 2000 and granted November 8, covers "Methods and system of obtaining consumer reviews". Patent 6,963,867, filed on March 31, 2003, covers "Search query processing to provide...