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Implemented as of April 1985.
Since then, China's patent law has been revised many times:
The Decision on Amending the Patent Law of People's Republic of China (PRC) was revised for the first time on September 4th, 65438 by the 27th meeting of the Standing Committee of the Seventh NPC.
The Decision of the 17th NPC Standing Committee Meeting on Amending the Patent Law of People's Republic of China (PRC) was amended for the second time on August 25th, 2000.