Patent ID: 7102871

Claim:
An electrostatic chuck assembly, comprising: a base having a first end surface and a second end surface; a ceramic element disposed on the first end surface and comprising a first retardant bole; a pedestal disposed on the ceramic element and comprising a second retardant hole adjacent to the first retardant hole; a main body disposed on the second end surface and comprising a through hole having a first threaded portion; and at least one pushing element capable of penetrating the through hole and pushing against the ceramic element and pedestal to separate the ceramic element and pedestal from the first end surface of the base, wherein the at least one pushing element comprises a second threaded portion, a first retardant portion and a second retardant portion, the first retardant portion is adjacent to the second threaded portion, the second retardant portion is adjacent to the first retardant portion, the second threaded portion rotatably engages the first threaded portion, the first retardant portion is engaged in the first retardant hole, and the second retardant portion penetrates the first retardant hole and is engaged in the second retardant hole.