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To remedy this problem, this study aims to establish an efficient classification system with a special focus on features extraction and application of extension theory. We first propose a compound method to determine the features, and then, we propose an extension-based classification method to develop an efficient patent classification system. Using cloud computing patents as the database, the experimental results show that our proposed scheme can outperform the classification quality of the traditional classifiers.<\/jats:p>","DOI":"10.1142\/s0219622020500248","type":"journal-article","created":{"date-parts":[[2020,6,3]],"date-time":"2020-06-03T06:41:26Z","timestamp":1591166486000},"page":"1149-1172","source":"Crossref","is-referenced-by-count":3,"title":["An Extension-Based Classification System of Cloud Computing Patents"],"prefix":"10.1142","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6984-0057","authenticated-orcid":false,"given":"Jia-Yen","family":"Huang","sequence":"first","affiliation":[{"name":"Department of Information Management, National Chin-Yi University of Technology, No. 57, Sec. 2, Zhongshan Rd., Taiping Dist., Taichung City 41170, Taiwan, Republic of China"}]},{"given":"Ke-Wei","family":"Tan","sequence":"additional","affiliation":[{"name":"Department of Information Management, National Chin-Yi University of Technology, No. 57, Sec. 2, Zhongshan Rd., Taiping Dist., Taichung City 41170, Taiwan, Republic of China"}]}],"member":"219","published-online":{"date-parts":[[2020,7,20]]},"reference":[{"key":"S0219622020500248BIB001","doi-asserted-by":"publisher","DOI":"10.1016\/j.wpi.2013.12.006"},{"key":"S0219622020500248BIB002","doi-asserted-by":"publisher","DOI":"10.1007\/s11192-019-03219-4"},{"key":"S0219622020500248BIB003","doi-asserted-by":"publisher","DOI":"10.1016\/j.ipm.2006.07.012"},{"key":"S0219622020500248BIB004","first-page":"1975","volume":"6","author":"Li Q.","year":"2007","journal-title":"Progress in Geophysics"},{"key":"S0219622020500248BIB005","first-page":"1","volume":"2014","author":"Hsieh C. 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