Patent ID: 8702365

Claim:
A substrate processing apparatus comprising: a process module configured to process a substrate; a main load unit disposed at a front side of the process module for receiving at least one container accommodating substrates, the main load unit being configured so that substrates are transferred between the container placed on the main load unit and the process module; a buffer load unit disposed above the main load unit for receiving at least one container accommodating substrates, the buffer load unit being horizontally movable into and outward from the process module; and at least one transfer unit disposed above the main load unit for transferring a container between the main load unit and the buffer load unit; wherein the buffer load unit comprises at least one buffer port configured to receive a container, and the buffer port is horizontally movable into and outward from the process module, wherein the main load unit comprises at least one load port configured to receive a container, and the buffer port is disposed above the load port and faces the load port, and wherein the transfer unit is movable into and outward from the process module.