Patent ID: 7063819

Claim:
A device for processing gases, comprising: a high voltage electrode; a ground electrode slightly spaced from the high voltage electrode; a dielectric layer disposed adjacent to the high voltage electrode between the high voltage electrode and the ground electrode; a gas modification passage established within the housing between the dielectric layer and the ground electrode; a process gas inlet configured to deliver a process gas to the gas modification passage; and an additive gas supply inlet configured to inject an additive gas to the gas modification passage; wherein the ground electrode is established by an additive gas supply tube; the additive gas supply tube having a first end forming the additive gas supply inlet at the process gas inlet and a second end extending internal to the high voltage electrode to form an inner wall of the gas modification passage; wherein the additive gas supply tube is in direct fluid communication with the gas modification passage to inject the additive gas into the gas modification passage independent from the process gas such that at least a portion of the additive gas is injected independently into a location in the gas modification passage that is downstream from the process gas inlet.