Patent ID: 6453992
Filing Date: 2002-09-24
Classification: C23C

Abstract:
A temperature controllable gas distributor apparatus, comprising:a cover, having an uppermost portion and a lowermost portion, wherein a first fluid passage is formed between the uppermost and lowermost portions; a distributing plate attached below the covet and having a plurality of nozzles for distributing gas, wherein said nozzles have an uppermost portion diameter, an intermediate portion diameter, and a lowermost portion diameter which are different from each other and wherein the uppermost portion diameter is largest, and the lowermost portion diameter is smallest; at least one temperature sensor installed in the first fluid passage and configured to detect a temperature of a fluid in the first fluid passage; an inlet tube connected to the first fluid passage for admitting a fluid into the first fluid passage; an outlet tube connected to the first fluid passage for capturing fluid flowing out of the first fluid passage, wherein a second passage is formed enclosed within edge portions of the uppermost portion of the cover, and wherein a first heater wire is disposed in the second passage and is configured to selectively heat the cover; a third passage in the distributing plate connected to a source of fluid for flowing the fluid through the third passage; and a second heater wire is disposed in the third passage.