The patent if it is being utilized is an admission of failure on the part of google. It's clear that by rank manipulating dynamic, changing documents downward and devaluing links (the basis of the internet) that they simply cannot deal with a dynamic world wide web based document collection.
The patent looks more like a web that they would like to index versus what exists. A genuine departure from reality, total fail. The character of the web is dynamic and ever changing, google has a problem with that, as do those who use their service.