A patent is an exclusive right granted for an invention by the government to the inventor to make, to use, and to sell an invention for a specified number of years. Patent law is one branch of the larger legal field known as intellectual property, which also includes trademark and copyright law.It centers around the concept of novelty and inventive step. The special potential of a patent is accordingly that it may be used to prevent all others from including any form of invention in their product and services.