Letter Sample 1 (Claiming against a company) Dear Sir or Madam, I' ve noticed in your catalogue that you are selling a new product—the Potato Scrubber. This product is very similar, if not identical, to a product I invented in 2008. Therefore, I think there is a problem for you to say this product is your own. If you check online at the Patent Office you'll see my patent was granted, and I own all rights to this invention as well as the name Potato Scrubber. The whole application process was directed by my lawyer to ensure it was done correctly. Usually companies try to get out of it, but I can assure you there is no error here. I hired a lawyer to make sure there wouldn't be any errors. Although I didn't go further than create a working model, I knew it was only a matter of time someone would try to make money from it. I agree with you that the Potato Scrubber is a very useful widget, but I'm afraid you cannot sell it without my permission. Sincerely ...