External supporting cover for user device

An external cover of a user device, comprising:

• a first cover including an inside surface and an outside surface including first and second end surfaces;
• a second cover;
• and
• a hinge for connecting the first cover and the second covers for pivoting the first cover and second cover over a front surface and a rear surface of the user device,
• wherein the first cover holds the user device on the inside surface of the first cover, and at least one slip preventing unit are provided on at least the first and second end surfaces of the outside surface of the first cover for providing enhanced friction between the first cover and a flat location so that the first cover maintains a stable state in various holding modes so that the external cover slantedly supports the user device in the various holding modes,
• wherein the various holding modes include a typing mode and a viewing mode,
• wherein in the typing mode, the user device is inclinedly supported at a shallow angle of 30 degrees or less, and
• wherein in the typing mode, the user device is inclinedly supported at a steep angle of substantially 60 degrees to 90 degrees.

An external cover of a user device, comprising;

• a first cover;
• a second cover including a length;
• and
• a hinge connecting the first cover and the second covers for pivoting the first cover and second cover over a front surface and a rear surface of the user device,
• wherein the first cover opens and closes a front surface of the user device, and comprises first, second, and third folding lines along a longitudinal direction extending generally along the length of the second cover such that the first cover is divided into a first support, a second support, a third support, and a fourth support when folded along each of the folding lines,
• wherein in a first user holding mode, the second support horizontally contacts a floor, the fourth support contacts a horizontal portion of the lower cover, the first support vertically supports a portion between the lower cover and the second support, and the third support vertically supports a portion between the second support and the fourth support, and
• wherein in a second user holding mode, the first support contacts a portion of the lower cover for providing vertical support, the third and fourth supports contacts the floor and provides horizontal support, and the second support vertically supports a portion between the first support and the third support, and supports the user device.