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:
Apr. 23, 2002
Filed:
Feb. 24, 1999
Takuya Okamoto, Sagamihara, JP;
Toru Takahashi, Sagamihara, JP;
Hisamitsu Kawaguchi, Sagamihara, JP;
Katsumi Tada, Kawasaki, JP;
Noriyuki Yamasaki, Yokohama, JP;
Hitachi LTD, Tokyo, JP;
Abstract
A document search method and apparatus and a portable medium used therefor are described, in which when registering a document in a data base, the logic structures of each document to be registered are superposed one on another to generate a structure index in which the structure elements having the same position of occurrence in the document are represented by a single meta-node. At the time of document search, a mass of the meta-nodes meeting a specified structural condition is determined with reference to the structure index. A string index is searched with the meta-node identifiers as a key thereby to determine a mass of documents meeting the specified condition. As a result, a highly accurate structure-specified search is made possible on a document data base including a mass of structured documents. In the structure-specified search of structured documents, the conditions for the position of occurrence of the logic elements in the document are specified, thereby making possible a highly accurate structure-specified search.