Just to keep everyone in the loop, Tunze began sending out cease and desist letters to US retailers distributing the Jebao pumps based on design patent USD567821 S1. Their claim is the design is too similar. To be clear, this is not a patent, but a design patent, which does not protect functionality but cosmetic features alone. Despite what people are saying, it won't stop production of these pumps but it is typically enough to scare smaller vendors from distributing the pumps in the US. Most US retailers have pulled them from their sites in response to this claim. To my knowledge, no lawsuit has been filed against Jebao, but Tunze is attempting to curb the distributors in the US.