Spectroscopic plasma torch for microwave induced plasmas
May 9, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re29304 3450926 3562486 3892882 Gas analyzing method and apparatus for performng the same Metastable argon stabilized arc devices for spectroscopic analysis Plasma etching apparatus Sample introduction system for flameless emission spectroscopy Plasma torch and a method of producing a plasma Inductively coupled plasma discharge in flowing non-argon gas at atmospheric pressure for spectrochemical analysis InventorsApplicationNo. 349205 filed on 05/09/1989US Classes:219/121.5, Nozzle system219/121.51, Gas supply system219/121.52, Electrode structure315/111.51Induction typeExaminersPrimary: Paschall, Mark H.Attorney, Agent or FirmInternational ClassB23K 009/00AbstractA spectroscopic plasma torch suitable for use at atmospheric pressure is disclosed. The torch utilizes a microwave induced helium plasma confined in a plasma discharge tube. The plasma is suspended and stabilized by a vortex flow of helium. The torch includes a high velocity gas jet for introducing sample materials into the plasma. The design avoids the formation of carbon deposits in the plasma discharge tube caused by the premature pyrolysis of organic materials outside the plasma and prevents other sample materials from being adsorbed on the surface of the plasma tube. Because of these characteristics, the torch is particularly well suited for use as a component in a gas chromatography detector which employs helium as the plasma support gas.Other References
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