On January 10, 2017, the China National Intellectual Property Administration (hereinafter refered as CNIPA) issued the invalidation decision No. 31081, announcing that all patent rights of utility model, entitled "Automatic retractable water extractor for underground drip irrigation," which were jointly owned by China Irrigation and Drainage Development Center and other organizations were all invalid ( The picture is for reference only and have nothing to do with this patent).

After accepting the client's commission, the Hengbo team conducted a lot of arduous searches and eventually invalidated the patent.

According to the law, the patentee, who is dissatisfied with the invalidation decision, can file an administrative lawsuit request with the Beijing Intellectual Property Court within three months.

The details of the invalidation decision can be found in Annex: Invalidation Decision No. 31081.