Patent ID: 11866825
Assignee: TOKYO ELECTRON LIMITED
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 5:
6. A gas supply method comprising:
disposing a substrate in a treatment vessel to process the substrate;
venting the treatment vessel using a venting mechanism to form a vacuum atmosphere;
supplying a gas from a gas source to an upstream flow path in a gas supply path including the upstream flow path and a plurality of branch paths formed by branching a downstream side of the upstream flow path into a plurality of paths, each of the branch paths being connected to the treatment vessel and being respectively provided with first valves each having a variable opening degree without being completely closed;
diverting the gas into the branch paths;
supplying the gas or shutting off the supply of the gas to a downstream side thereof using a second valve disposed in the upstream flow path;
detecting a pressure in the treatment vessel using a pressure sensor; and
detecting an abnormality on the downstream side of the second valve in the gas supply path using an abnormality detector based on the detected pressure in the treatment vessel.