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Research on Patent Maintenance and Its Influencing Factors in the Field of Information Technology
Received date: 2013-08-18
Revised date: 2013-09-06
Online published: 2013-09-20
This paper discusses the applicability and effectiveness when survival analysis is applied to the study of patent maintenance. The authors investigate the entire invention patents of China in information technology field from 1985 to 2009 by using the survival function and stratified cox regression model, in order to determine its distribution of maintenance period and compare patent maintenance status between applicants from different countries and quantify the impact of risk factor. The results show that the median survival period in information technology field is approximately 10.5 year, only 1% patents maintain until expiration; The maintenance status of American applicants remains the best, while the overall maintenance period of Chinese applicants is the shortest with the exception that some patents keep the acceptance of market for a long time; The type of patent applicants, authorization year, the number of inventors, the number of applicants, and the page number of the application form influence patent maintenance in a successively decreasing way.
Song Shuang , Chen Xiangdong . Research on Patent Maintenance and Its Influencing Factors in the Field of Information Technology[J]. Library and Information Service, 2013 , 57(18) : 98 -103,132 . DOI: 10.7536/j.issn.0252-3116.2013.18.017
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