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The patent titles are insightful.
1 7,711,679 Phrase-based detection of duplicate documents in an information retrieval system
2 7,702,618 Information retrieval system for archiving multiple document versions
3 7,603,345 Detecting spam documents in a phrase based information retrieval system
4 7,599,914 Phrase-based searching in an information retrieval system
5 7,584,175 Phrase-based generation of document descriptions
6 7,580,929 Phrase-based personalization of searches in an information retrieval system
7 7,580,921 Phrase identification in an information retrieval system
8 7,536,408 Phrase-based indexing in an information retrieval system
9 7,426,507 Automatic taxonomy generation in search results using phrases
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