Recently, Liu Shen represented a manufacturer of residual film recycling machines in defending a patent infringement dispute and achieved a comprehensive victory. The opposing party was forced to withdraw the infringement lawsuit, and its involved patent was subsequently fully invalidated in patent invalidation proceedings, safeguarding the client’s legitimate rights and interests to the fullest extent.

The Liu Shen team was engaged at a critical juncture, when the patent infringement trial was imminent and the client’s prior patent invalidation attempt had failed. Upon engagement, Liu Shen promptly formulated a thorough response strategy. On one hand, the team promptly filed an administrative lawsuit against the unfavorable invalidation decision, minimizing its adverse impact on any subsequent re-filed invalidation petition. On the other hand, in the infringement litigation, the team thoroughly identified flaws in the opponent’s evidence collection, broke the logical chain of its infringement allegations, and compelled the plaintiff to withdraw the lawsuit.

Following the phased victory in the infringement proceedings, Liu Shen maintained a proactive stance. Based on exhaustive prior art retrieval and rigorous legal reasoning for invalidation, the team promptly initiated new patent invalidation proceedings and successfully secured the complete invalidation of the opponent’s patent. This prevented the opposing party from refiling a claim with new evidence, thoroughly removing competitive obstacles for the client and ensuring its normal business operations free from disruption. The firm’s professional handling of the case won high recognition from the client.

Lead Attorneys for the Case Series: ZHANG Xiang, WANG Xiaojing, CHEN Xi