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. 21, 2020
Filed:
Mar. 27, 2015
Hitachi, Ltd., Tokyo, JP;
Atsushi Hatakeyama, Tokyo, JP;
Michio Iijima, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
A document retrieval system includes a storage device and a retrieval server. The storage device stores document data including documents compressed so as to correspond to a plurality of divided document groups, indexes indicating correspondence relations between partial character strings for retrieving the documents and first identifiers indicating the documents, and a first correspondence table in which the document groups are divided into document small groups, and second identifiers which indicate the document small groups correspond to the partial character strings. The retrieval server retrieves, in response to an input of a retrieval character string, a second identifier corresponding to a partial character string included in the retrieval character string, from the first correspondence table, decompresses document data in a document group, retrieves a first identifier corresponding to the partial character string, obtains document data corresponding to the retrieved first identifier, and outputs the retrieved first identifier.