A patent is the grant of right to stop others from selling, making, using, or importing discovery, including new and improved products and processes. If the patent expires, the rights to make, use, sell or import the discovery is lost. A trademark can be a logo, name, symbol through which one can differentiate a product or service of one commercial entity from that of another. A copyright is a kind of protection granted to authors of original authorship such as literary, musical computer software,and broadcasters in their programs, etc. The patent lawyer guides the clients through the entire patent procurement process. Also patent lawyers in Nashua are required to represent the clients in patent violation litigation, whether as an applicant to stop the violation or as a defendant to defend against the accuser. The trademark lawyer in Nashua is required to assist with issues relating to the registration and protection of trademarks. The clients should be guided through the entire trademark registration process. In this case also lawyer is required to represent the clients in patent breach of litigation, whether as an applicant to stop the violation or as a defendant. Likewise, the copyright lawyer in Nashua assists the client regarding the registration and protection of copyrights.