Document retrieval system using analog signal comparisons for retrieval conditions including relevant keywords
Patent 5140692 Issued on August 18, 1992. Estimated Expiration Date: 
June 6, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 6, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesKey input device Entity-attribute value database system with inverse attribute for selectively relating two different entities Patent #: 5010478 InventorAssigneeApplicationNo. 533829 filed on 06/06/1990US Classes:707/5, Query augmenting and refining (e.g., inexact access)707/101Manipulating data structure (e.g., compression, compaction, compilation)ExaminersPrimary: Anderson, Lawrence E.Attorney, Agent or FirmInternational ClassG06F 015/40Foreign Application Priority Data1989-06-13 JPAbstractA document retrieval system retrieves a registered document from a document database responsive to a designated retrieval condition including one or a plurality of designated keywords. The document retrieval system includes a storage for storing keyword relationships which indicate relationship values of keywords and relations of the keywords and registered documents, an input part for designating a retrieval condition including one or plurality of designated keywords, where the retrieval condition determines a registered document which is to be retrieved from the storage, a selector for selecting a plurality of keyword relationships based on the retrieval condition and for converting the selected keyword relationships into analog signals, an analog operation circuit for calculating a relevance of document based on the analog signals, and a converter for converting the calculated relevance of document into a digital value.Other References
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