Sometimes when you search at Google, you might not find any results that you find interesting and may search again using a somewhat similar query. Chances are that you don’t want to see the same sites or pages all over again. A newly granted patent from Google describes how the search engine might demote results for pages from sites that show up in an earlier search when they appear in your results during a following search during the same query session.
For example, imagine that you search for [black jacket] and don’t see any results that you like on the first page, regardless of whether you clicked upon any of them or not. Instead of going to the second page, you search for [black coat]. Since the queries are related, it’s possible that you might see results from some of the same sites in both searches, which the patent refers to as “repetitive” search results. Google may take your decision to search more as an indication that you weren’t satisfied with the pages shown in the first set of results, and may demote some of the “repetitive” sites or pages from that first query so they aren’t as prominent in the second set of search results.
So, your search for [black jacket] might show a page from the site “Winter Coats Online.” You might click upon it, or you might not. Regardless, when you move on to search for [black coat], if a page (the same page or another page) from “Winter Coats Online” would have ranked highly for that search, Google might push it down in search results so that it isn’t listed as prominently.