The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 2004
Filed:
Oct. 10, 2001
Yoshiki Watanabe, Nakai-machi, JP;
Hiroshi Hayata, Nakai-machi, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A B+ tree index for a full-text search through documents is created fast and fast searches are implemented using the index. A B+ tree index to register sets of words serving as keys and documents containing the words is constituted of a plurality of B+ tree subindexes; a document identification number id and a word identification number iw are assigned to a document and a word to uniquely identify them; as a function to apply to documents, a hash function Hd is provided that maps a document identification number to a value indicating the position of horizontal direction of a two-dimensional array, and as a function to apply to words, a hash function Hw is provided that maps a word identification number to a value indicating the position of vertical direction of the two-dimensional array; and the occurrence of a word in a document is registered in a corresponding subindex B+ tree (Hd(id), Hw(iw)) by using values obtained by applying the hash functions to the document identification number and the word identification number, respectively. The index is searched using a value with a word identification number as a key and a document identification number concatenated.