A patent is a set of exclusive rights granted by a state (national government) to an inventor or their assignee for a limited period of time in exchange for a public disclosure of an invention.
The grant of patent effectively gives the inventor the right to exclude others from using the invention for a limited period of time. It confers the right to manufacture, use, offer for sale, sell or import the invention for the prescribed period.
As soon as your patent is granted, you have the right to exclusively utilize your invention, issue licenses, and prohibit others from using your invention.
The invention is only protected in countries in which the patent is valid. For example, a German patent does not facilitate protection in the US market. Only a US patent can protect your invention the United States.
Besides the geographical range, the scope of the patent content plays a major role in order to assess how strong your protection actually is.
First and foremost, this can be deduced from patent claims specified in your application filing documents. The more far-reaching your claims, the stronger the protection of your intellectual property. The number of claims and the phrasing of claims is very important.
The monopoly over patented right can be exercised by the owner for a period not exceeding 20years from the date of application of patent.