Indicators for patent quality and their effectiveness：A case study on machine tools patents issued by SIPO

Chen Haiqiu; Han Liyan

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Science Research Management ›› 2013, Vol. 34 ›› Issue (5) : 93-101.

Indicators for patent quality and their effectiveness：A case study on machine tools patents issued by SIPO

Chen Haiqiu, Han Liyan

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Abstract

Against the background of explosive expansion of patent quantity worldwide,the effective evaluation indicators at the early stage of patents serve as a powerful tool for mastering the technology development trend, service strategy, and technological management. Taking machine tool patents issued by State Intellectual Property Office (SIPO) of China during the period of 1986-2005 as a research object, early stage indicators are constructed based on the economic or technical information obtained in the early patent bibliography, and the patent renewal duration is selected as the proxy variable of the patent quality. How effective the patent quality characterized by these indicators is studied with the aid of the statistical software of SPSS and Cox survival analysis modeling. It is found that the increase of claim number is able to reduce the survival risk of internal patents, meanwhile the increase of both specification pages and inventors is able to reduce the survival risk of external patents, and the average patent quality for corresponding group is relatively higher. It is further indicated that the number of patent claims, patent specification pages, and inventors are able to reflect patent quality with the different degrees. The results and approaches of the study enlighten on the exploration and determination of early stage patent evaluation indicators, and these indicators are especially suitable to the SIPO data, and provide the reference for the study of patent asset value in the view of generalized fictitious economics.

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patent quality / patent bibliometrics / evaluation indicator / effectiveness

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Chen Haiqiu, Han Liyan. Indicators for patent quality and their effectiveness：A case study on machine tools patents issued by SIPO[J]. Science Research Management. 2013, 34(5): 93-101

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