Patent Document ID: 8612427
Application ID: 12717663

Base Claim:
1. A method, performed by at least one computer system, of retrieving documents in response to a search query submitted on a first date that includes one or more phrases, the method comprising: selecting from a corpus of documents a plurality of documents that include at least one of the one or more phrases and that are relevant to the query based on a relevance score for the selected documents; determining, using a processor of the at least one computer system, for at least one of the selected 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 selected documents, the weighted relevance score for a particular document being based on the relevance score for the particular document and a difference between the first date and the date range for the particular document; and ranking, using a processor of the at least one computer system, the selected documents according to their weighted relevance scores.

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Claim 3:
3. The method of claim 1 , wherein the relevance score for each of the selected documents is based on one or more from the group consisting of: document length of the document during the date range, a frequency of a phrase contained in the document during the date range, types of HTML markup in the document during the date range.