Scientometrics
Faramarz soheili; shiva shirdavani
Abstract
Purpose: This research tries to determinants of patent citations by using a survival analysis.Methods: Research method was patent citation analysis. Research population consisted of 25,392 patents in the USPTO database in the Data Processing: Artificial Intelligence (AI) (Category: 706). Cox and Kaplan-Meier ...
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Purpose: This research tries to determinants of patent citations by using a survival analysis.Methods: Research method was patent citation analysis. Research population consisted of 25,392 patents in the USPTO database in the Data Processing: Artificial Intelligence (AI) (Category: 706). Cox and Kaplan-Meier regression were used to analyze the data.Finding: The research findings showed that of the 6749 patents that received first citation, in the first three months, the probability of citing each patent was less than one percent, and the probability of being cited increased over time. So that probability has risen to over 90% after 84 months. Kaplan-Meier test results showed that it takes between 38 and 40 months on average to a patent obtain first citation in the field of AI.Results: The results of the Cox test showed that, at the significant level of 0.05, inventors and assignees were influenced the productivity and receiving citation of patents. Purpose: This research tries to determinants of patent citations by using a survival analysis.Methods: Research method was patent citation analysis. Research population consisted of 25,392 patents in the USPTO database in the Data Processing: Artificial Intelligence (AI) (Category: 706). Cox and Kaplan-Meier regression were used to analyze the data.Finding: The research findings showed that of the 6749 patents that received first citation, in the first three months, the probability of citing each patent was less than one percent, and the probability of being cited increased over time. So that probability has risen to over 90% after 84 months. Kaplan-Meier test results showed that it takes between 38 and 40 months on average to a patent obtain first citation in the field of AI.Results: The results of the Cox test showed that, at the significant level of 0.05, inventors and assignees were influenced the productivity and receiving citation of patents.
Ali Mansoori; faramarz Soheli
Abstract
Aims: The purpose of these research was examine the knowledge flow between Islamic countries inventors in order to determine the impact of lag time in patents knowledge flow.Methodology: Citation analysis was used as the research method, the research population includes all patents of Islamic countries ...
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Aims: The purpose of these research was examine the knowledge flow between Islamic countries inventors in order to determine the impact of lag time in patents knowledge flow.Methodology: Citation analysis was used as the research method, the research population includes all patents of Islamic countries recorded from 2005 to 2014 in the USPTO. Using the especial formulas lag time was calculated.Finding: research Finding showed that in more than 95% of Patent, the length of time between the patent application and the granting of the patent takes 2-3 years. Average of lag time between examined patent citations were 2.93 years. Data analysis also showed that maximum lag time frequency were 2-3 years that which includes more than 40% of cited patent.Results: the results of testing hypotheses showed that there are significance correlation between grant year, lag time between of grant year and grant year of cited patent with knowledge flow in p<0,05 level. Results also showed that the relationship between variables are negative. The findings from multiple regression analysis revealed that about 13% of log time’s variable variance was determined by knowledge flow.
