The owner of a valid enforceable unexpired US patent has the right to determine who makes, uses and sells products that are covered by the claims in the patent. There are four requirements in my last statement. 1. The patent has to be valid. Or more specifically, the claims of that patent have to meet the requirements of novelty, utility and non-obviousness. A patent is presumed to be valid when issued by the USPTO but the claim scope is bounded or limited by the prior art, statements and actions taken during prosecution of the patent application at the USPTO and even by statements made in the patent specification itself. 2. The patent has to be enforceable. The Courts will not be permit enforcement of a patent that has been obtained by fraud. 3. The patent has to be unexpired. The maximum life of most patents is 20 years from the earliest application date. Patents can go into the public domain earlier if the patent maintenance fees are not paid in a timely manner. 4. One or more claims of the patent in question must read on the competitive device. As you can appreciate, you have asked a question that is very situation sensitive. The particular answer in your case will vary depending on the configuration of you device as well as the patent(s) in question. If you are concerned about potential accusation of patent infringement, the first step would be to have this reviewed by a patent attorney. This review will help you to better assess your risks in the area and perhaps even suggest a way to design around one or more of the patents in question. Depending on the relationship you have with you manufacturer, perhaps you can negotiate some terms that indemnify you against allegations of infringement.
Answered on Sep 29th, 2011 at 10:12 AM