Patent ID: 11971217
Assignee: ASM IP HOLDING B.V.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 3:
4. The batch furnace assembly according to claim 1, wherein the process chamber housing comprises a quartz tube and a metal flange which supports the quartz tube;
wherein the door assembly comprises:
a first door plate including a first seal which engages in the closed position the metal flange of the process chamber housing;
a second door plate including a second seal which engages in the closed position the quartz tube of the process chamber housing;
a third door plate which is rotatably mounted relative to the first and the second door plates; and
a diffusion barrier between the second door plate and the rotatable third door plate, and

wherein the door assembly chamber in the closed position of the door assembly is bounded by the first seal and the diffusion barrier, wherein, in use, purge gas supplied via the purge gas inlet flows via the diffusion barrier to the exhaust.