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Information retrieval system for archiving multiple document versions

  • US 9,817,886 B2
  • Filed: 07/04/2016
  • Issued: 11/14/2017
  • Est. Priority Date: 07/26/2004
  • Status: Active Grant
First Claim
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1. A method, performed by at least one computer system, of retrieving documents in response to a search query that includes a phrase and a first date, the method comprising:

  • selecting, from a corpus of documents, a plurality of documents that are relevant to the query;

    determining, using a processor of the at least one computer system, for at least one of the plurality of documents, a date range for the document, the date range representing a period for which no change in the document has been detected;

    calculating, using a processor of the at least one computer system, a weighted relevance score for each of the plurality of documents, the weighted relevance score for a particular document being a relevance score for the particular document adjusted by a difference between the first date and the date range for the particular document when the particular document has a date range; and

    ranking, using a processor of the at least one computer system, the plurality of documents according to their weighted relevance scores.

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