The question
My partner and I have been designing a device called a “follower” that sits inside gun magazines so that guns designed to shoot a specific type of ammo can shoot different ammo. A company made these back in 2007 but stopped making them around the same time. Using our 3D printer we decided to design one from scratch with our own measuremeants, materials, and designs. We checked the patent database to make sure we weren’t infringe on others designs. However, we discovered a gentleman in the same Reddit community was doing the same thing and selling them on the internet. We realized that he started making his at the same time we did by doing some research. The other day we received a cease and desist letter in the mail, claiming we are infringing on his patent application and design? We aren’t sure how he found out where we live or even our names but he did. He threatened to sue us for copying his design (even tho we completely made our own and they were already made before so)?????