A patent is defined as a technological concept is realized as a creative invention by using the natural laws.
A utility model means a simple idea related to an object, or an idea related to an object which can be used more conveniently and usefully by improving a conventional invention.

Duration Period
A patent : it lasts for 20 years from the registration date after application.
A utility model : it lasts for 10 years from the registration date after application (it lasts for 15 years according to the old law).