{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,18]],"date-time":"2026-01-18T02:03:28Z","timestamp":1768701808992,"version":"3.49.0"},"reference-count":20,"publisher":"Association for Computing Machinery (ACM)","issue":"2","license":[{"start":{"date-parts":[[2005,6,1]],"date-time":"2005-06-01T00:00:00Z","timestamp":1117584000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.acm.org\/publications\/policies\/copyright_policy#Background"}],"content-domain":{"domain":["dl.acm.org"],"crossmark-restriction":true},"short-container-title":["ACM Transactions on Asian Language Information Processing"],"published-print":{"date-parts":[[2005,6]]},"abstract":"<jats:p>The importance of patents is increasing in global society. In preparing a patent application, it is essential to search for related patents that may invalidate the invention. However, it is time-consuming to identify them among the millions of patents. This article proposes a patent-retrieval method that considers a claim structure for a more accurate search for invalidity. This method uses a claim text as input; it consists of two retrieval stages. In stage 1, general text analysis and retrieval methods are applied to improve recall. In stage 2, the top N documents retrieved in stage 1 are rearranged to improve precision by applying text analysis and retrieval methods using the claim structure. Our two-stage retrieval introduces five precision-oriented analysis and retrieval methods: query-term extraction from a portion of a claim text that describes the characteristics of a claim; query term-weighting without term frequency; query term-weighting with \u201cmeasurement terms\u201d; text retrieval using only claims as a target; and calculating the relevant score by \u201cpartially\u201d adding scores in stage 2 to those in stage 1. Evaluation results using test sets of the NTCIR4 Patent Retrieval Task show that our methods are effective, though the degree of the effectiveness varies depending on the test sets.<\/jats:p>","DOI":"10.1145\/1105696.1105702","type":"journal-article","created":{"date-parts":[[2006,2,6]],"date-time":"2006-02-06T15:07:09Z","timestamp":1139238429000},"page":"190-206","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":37,"title":["Proposal of two-stage patent retrieval method considering the claim structure"],"prefix":"10.1145","volume":"4","author":[{"given":"Hisao","family":"Mase","sequence":"first","affiliation":[{"name":"Hitachi, Ltd., Kanagawa, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tadataka","family":"Matsubayashi","sequence":"additional","affiliation":[{"name":"Hitachi, Ltd., Kanagawa, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuichi","family":"Ogawa","sequence":"additional","affiliation":[{"name":"Hitachi, Ltd., Kanagawa, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Makoto","family":"Iwayama","sequence":"additional","affiliation":[{"name":"Hitachi, Ltd., Kanagawa, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tadaaki","family":"Oshio","sequence":"additional","affiliation":[{"name":"Japan Patent Information Organization, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2005,6]]},"reference":[{"key":"e_1_2_1_1_1","volume-title":"Proceedings of ACL 2003 Workshop on Patent Corpus Processing. http:\/\/www.slis.tsukuba.ac.jp\/~fujii\/acl2003ws.html.","author":"ACL","year":"2003","unstructured":"ACL 2003 . Proceedings of ACL 2003 Workshop on Patent Corpus Processing. http:\/\/www.slis.tsukuba.ac.jp\/~fujii\/acl2003ws.html. ACL 2003. Proceedings of ACL 2003 Workshop on Patent Corpus Processing. http:\/\/www.slis.tsukuba.ac.jp\/~fujii\/acl2003ws.html."},{"key":"e_1_2_1_2_1","volume-title":"Proceedings of the Sixth Text Retrieval Conference (TREC-6). 367--378","author":"Bear J.","unstructured":"Bear , J. et al. 1997. Using information extraction to improve document retrieval . In Proceedings of the Sixth Text Retrieval Conference (TREC-6). 367--378 . Bear, J. et al. 1997. Using information extraction to improve document retrieval. In Proceedings of the Sixth Text Retrieval Conference (TREC-6). 367--378."},{"key":"e_1_2_1_3_1","volume-title":"Working Notes of the Fourth NTCIR Workshop Meeting. 225--232","author":"Fujii A.","unstructured":"Fujii , A. et al. 2004. Overview of patent retrieval task at NTCIR-4 . In Working Notes of the Fourth NTCIR Workshop Meeting. 225--232 . Fujii, A. et al. 2004. Overview of patent retrieval task at NTCIR-4. In Working Notes of the Fourth NTCIR Workshop Meeting. 225--232."},{"key":"e_1_2_1_4_1","volume-title":"Proceedings of RIAO-97","author":"Clarke C. L.","unstructured":"Clarke , C. L. et al. 1997. Relevance ranking for one to three term queries . In Proceedings of RIAO-97 , 5th International Conference \u201cRecherche d'Information Assistee par Ordinateur\u201d 388--400. Clarke, C. L. et al. 1997. Relevance ranking for one to three term queries. In Proceedings of RIAO-97, 5th International Conference \u201cRecherche d'Information Assistee par Ordinateur\u201d 388--400."},{"key":"e_1_2_1_5_1","volume-title":"Working Notes of the Fourth NTCIR Workshop Meeting. 246--249","author":"Itoh H.","year":"2004","unstructured":"Itoh , H. 2004 . NTCIR-4 patent retrieval experiments at RICOH . In Working Notes of the Fourth NTCIR Workshop Meeting. 246--249 . Itoh, H. 2004. NTCIR-4 patent retrieval experiments at RICOH. In Working Notes of the Fourth NTCIR Workshop Meeting. 246--249."},{"key":"e_1_2_1_6_1","volume-title":"Overview of the Fourth NTCIR Workshop. In Working Notes of the Fourth NTCIR Workshop Meeting. i--viii.","author":"Kando N.","year":"2004","unstructured":"Kando , N. 2004 . Overview of the Fourth NTCIR Workshop. In Working Notes of the Fourth NTCIR Workshop Meeting. i--viii. Kando, N. 2004. Overview of the Fourth NTCIR Workshop. In Working Notes of the Fourth NTCIR Workshop Meeting. i--viii."},{"key":"e_1_2_1_7_1","volume-title":"Working Notes of the Fourth NTCIR Workshop Meeting. 250--255","author":"Konishi K.","unstructured":"Konishi , K. et al. 2004. Invalidity patent search system of NTT DATA . In Working Notes of the Fourth NTCIR Workshop Meeting. 250--255 . Konishi, K. et al. 2004. Invalidity patent search system of NTT DATA. In Working Notes of the Fourth NTCIR Workshop Meeting. 250--255."},{"key":"e_1_2_1_8_1","volume-title":"Proceedings of the Conference on Advances in Production Management Systems. 377--382","author":"Mase H.","unstructured":"Mase , H. et al. 1996. Experimental simulation for automatic patent categorization . In Proceedings of the Conference on Advances in Production Management Systems. 377--382 . Mase, H. et al. 1996. Experimental simulation for automatic patent categorization. In Proceedings of the Conference on Advances in Production Management Systems. 377--382."},{"key":"e_1_2_1_9_1","volume-title":"Working Notes of the Fourth NTCIR Workshop Meeting. 256--261","author":"Mase H.","unstructured":"Mase , H. et al. 2004. Two-stage patent retrieval method considering claim structure . In Working Notes of the Fourth NTCIR Workshop Meeting. 256--261 . Mase, H. et al. 2004. Two-stage patent retrieval method considering claim structure. In Working Notes of the Fourth NTCIR Workshop Meeting. 256--261."},{"key":"e_1_2_1_10_1","first-page":"1208","article-title":"Morphological analysis system \u201cChasen","volume":"41","author":"Matsumoto Y.","year":"2000","unstructured":"Matsumoto , Y. 2000 . Morphological analysis system \u201cChasen .\u201d J. Information Processing Society of Japan. 41 , 11 (2000), 1208 -- 1214 (in Japanese). Matsumoto, Y. 2000. Morphological analysis system \u201cChasen.\u201d J. Information Processing Society of Japan. 41, 11 (2000), 1208--1214 (in Japanese).","journal-title":"J. Information Processing Society of Japan."},{"key":"e_1_2_1_11_1","unstructured":"Mizuno Y. 2002. Relevant document retrieval system. Tokugikon J. 223 (2000) (in Japanese).  Mizuno Y. 2002. Relevant document retrieval system. Tokugikon J. 223 (2000) (in Japanese)."},{"key":"e_1_2_1_12_1","unstructured":"NTCIR3 2002. Proceedings of the Third NTCIR Workshop on Research in Information Retrieval Automatic Text Summarization and Question Answering. http:\/\/research.nii.ac.jp\/ntcir\/workshop\/OnlineProceedings3\/index.html.  NTCIR3 2002. Proceedings of the Third NTCIR Workshop on Research in Information Retrieval Automatic Text Summarization and Question Answering. http:\/\/research.nii.ac.jp\/ntcir\/workshop\/OnlineProceedings3\/index.html."},{"key":"e_1_2_1_13_1","volume-title":"Working Notes of the Fourth NTCIR Workshop Meeting. http:\/\/research.nii.ac.jp\/ntcir-ws4\/NTCIR4-WN\/.","year":"2004","unstructured":"NTCIR4 2004 . Working Notes of the Fourth NTCIR Workshop Meeting. http:\/\/research.nii.ac.jp\/ntcir-ws4\/NTCIR4-WN\/. NTCIR4 2004. Working Notes of the Fourth NTCIR Workshop Meeting. http:\/\/research.nii.ac.jp\/ntcir-ws4\/NTCIR4-WN\/."},{"key":"e_1_2_1_14_1","unstructured":"Salton G. and Mcgill M. J. 1983. Introduction to Modern Information Retrieval. McGraw-Hill New York.   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In Proceedings of the ACL 2003 Conference. 56--65 . 10.3115\/11 1930 3.1119310 Shinmori, A. et al. 2003. Patent claim processing for readability structure analysis and term explanation. In Proceedings of the ACL 2003 Conference. 56--65. 10.3115\/1119303.1119310"},{"key":"e_1_2_1_17_1","volume-title":"Proceedings of the ACM SIGIR 2000 Workshop on Patent Retrieval. ACM","author":"SIGIR","year":"2000","unstructured":"SIGIR 2000 . Proceedings of the ACM SIGIR 2000 Workshop on Patent Retrieval. ACM , New York. http:\/\/research.nii.ac.jp\/ntcir\/sigir 2000ws\/. SIGIR 2000. Proceedings of the ACM SIGIR 2000 Workshop on Patent Retrieval. ACM, New York. http:\/\/research.nii.ac.jp\/ntcir\/sigir2000ws\/."},{"key":"e_1_2_1_18_1","volume-title":"The Fifth Text Retrieval Conference (TREC-5). E. M. Voorhees and D. K. Harman (eds.).","author":"Sumner R. G., Jr.","unstructured":"Sumner , R. G., Jr. and Shaw , W. M. , Jr . 1997. An investigation of relevance feedback using adaptive linear and probabilistic models . The Fifth Text Retrieval Conference (TREC-5). E. M. Voorhees and D. K. Harman (eds.). Sumner, R. G., Jr. and Shaw, W. M., Jr. 1997. An investigation of relevance feedback using adaptive linear and probabilistic models. The Fifth Text Retrieval Conference (TREC-5). E. M. Voorhees and D. K. Harman (eds.)."},{"key":"e_1_2_1_19_1","volume-title":"et al","author":"Takano A.","year":"2002","unstructured":"Takano , A. et al . 2002 . Development of the generic association engine for processing large corpora http:\/\/geta.ex.nii.ac.jp\/pdf\/itx2002.pdf. (in Japanese). Takano, A. et al. 2002. Development of the generic association engine for processing large corpora http:\/\/geta.ex.nii.ac.jp\/pdf\/itx2002.pdf. (in Japanese)."},{"key":"e_1_2_1_20_1","volume-title":"Working Notes of the Fourth NTCIR Workshop Meeting. 271--276","author":"Takeuchi H.","unstructured":"Takeuchi , H. et al. 2004. 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