15715
Areas covered : This review aims at highlighting the research advancements published in the patent literature between 1986 and 2012 , dividing patents according to both their time frame and applicants .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None