On March 31, 2021, the CNIPA issued No. 48928 Invalidation decision, declaring that the invention patent of Shenzhen Mindray Bio-medical Electronics Co., Ltd., which was entitled "a ventilation mode switching device, method, anesthesia machine and ventilator" remained valid.

After accepting the client's entrustment, the team of Hengbo had done a lot of preparatory works, successfully pointing out the defects of evidence and the wrong understanding of technology of the other party. Finally, The CNIPA decided to maintain the validity of the patent rights.

According to the law, if the claimant disagrees with the invalidation decision, he or she can file an administrative litigation to the Beijing Intellectual Property Court within 3 months.