By the end of 20 15, the patent law had been amended several times. When are they?

(Adopted at the Fourth Session of the Standing Committee of the Sixth NPC on March 1984, 2000, and the second amendment according to the Decision on Amending the Patent Law of People's Republic of China (PRC) at the Seventeenth Session of the Standing Committee of the Ninth NPC on August 25, 2000) and the Third Decision on Amending the Patent Law of People's Republic of China (PRC) at the Sixth Session of the Standing Committee of the Eleventh NPC on February 27, 2008.