The monopoly right granted to an inventor is a

The monopoly right granted to an inventor is called a "patent." A patent is a legal document that gives an inventor exclusive rights to their invention for a certain period of time, usually 20 years from the date of filing. This means that no one else can make, use, or sell the invention without the inventor's permission. Patents are granted for new, useful, and non-obvious inventions or discoveries, such as machines, processes, compositions of matter, and designs.