There are two design patents (US D680,805 S1 and US D688,912 S1) owned by Hydro Flask regarding a wide mouth lid. The first is what I consider somewhat unique, but the second I feel has been reduced and is too broad that remaining elements were already in use prior.
What is your opinion.
Should someone desire to enter the same field of selling bottles, would it recommended to push forward in using the same lid, but changing the rubber grip piece? To reduce risk of infringement, would it make sense to ask the USPSTO to reexamine the design patent considering the prior art? Does prior art have to be a patented product?