A Patent is an official document, issued by the U.S. Patent & Trademark Office (U.S.P.T.O.), granting property rights to the inventor or to the assignee (the latter is the owner of the patent).
An Inventor is always a person—never a company or any other type of organization.
An Assignee—the owner or holder of a patent—can be a person, or a company, or an organization, or a country.
The term of a patent is generally 20 years from the date of application in the United States, providing that maintenance fees are paid
A patent granted by the U.S.P.T.O. is effective only in the United States, its territories, and possessions.
A patent grants the right to exclude others from making, using, offering for sale, selling, or importing the invention—a patent does not grant “The” right to engage in any of those activities.
The assignee—the patent owner—may license the patent to another party.