James B Curtis

US Patent:

7501765, Mar 10, 2009

Filed:

Oct 1, 2004

Appl. No.:

10/956316

Inventors:

James R. Curtis - Lansdale PA, US
John A. Gorczyca - Lansdale PA, US

Assignee:

Illinois Tool Works Inc. - Glenview IL

International Classification:

H01J 17/04
H01J 9/02
H01J 1/00

US Classification:

313633, 313310, 313311

Abstract:

An ionizer emitter electrode is ideally formed of or at least partially coated with a carbide material, wherein the carbide material is selected from the group consisting of germanium carbide, boron carbide, silicon carbide and silicon-germanium carbide. Alternatively, a corona-producing ionizer emitter electrode is substantially formed of silicon carbide. Alternatively, a corona-producing ionizer emitter electrode is formed of an electrically conductive metal base that is at least partially coated with silicon carbide. Alternatively, a corona-producing ionizer emitter electrode ionizes gas when high voltage is applied thereto, and the emitter electrode is formed substantially of silicon carbide and has a resistivity of less than or equal to about one hundred ohms-centimeter (100 Ω-cm).

US Patent:

8067892, Nov 29, 2011

Filed:

Feb 26, 2009

Appl. No.:

12/393760

Inventors:

James R. Curtis - Lansdale PA, US
John A. Gorczyca - Landale PA, US

Assignee:

Illinois Tool Works Inc. - Glenview IL

International Classification:

H01J 17/04

US Classification:

313633, 313310, 313311

Abstract:

A method is provided for forming a corona-producing emitter electrode by depositing substantially pure silicon carbide by CVD and forming a corona-producing emitter electrode with the deposited silicon carbide. In addition, a method of forming a corona-producing gas ionizer is provided by providing a corona electrode formed from CVD silicon carbide, electrically coupling the corona electrode to a high voltage power supply, and providing an AC or DC voltage from the high voltage power supply to the corona electrode. Furthermore, a method of ionizing gas in an environment is provided by providing a corona-producing ionizer emitter electrode formed substantially of CVD silicon carbide, electrically coupling the electrode to a high voltage power supply, and providing an AC or DC voltage from the high voltage power supply to the electrode.