Samsung Electronics Co., Ltd.

Seong Su Jeong

Ji Hoon Choi

In Ju Lee

Ji Sung Kim

Jong Sung Park

Eun Suk Bang

In Cheol Jang

Nam Ki Sul

Bong Wha Kwak

Doo Pil Kim

Ki Sun Park

A washing machine including a washing tub to allow enhancement in washing efficiency. A washing tub of the washing machine includes a pattern having a protrusion portion to generate friction force between laundry and the washing tub and to thereby increase washing efficiency. The pattern has a concave-convex structure and performs action similar to a lifter, washing efficiency may be enhanced using tumbling generated by the pattern. A plurality of drain holes are arranged in a certain pattern in the washing tub to prevent a dehydration bottleneck phenomenon in which dehydration is concentrated at a particular drain hole and to increase a dehydration rate. The pattern is provided such that protrusion portions and recessed portions continue on the surface of the washing tub to enhance stiffness of the washing tub.

Washing machine having a plurality of concentrically formed recessed portions on the tub

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Ulsan, South Korea

Seong Su Jeong