A survey on Lag time in forming knowledge flow in Islamic countries patents

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.
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.
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