The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1999
Filed:
Oct. 30, 1996
David Lyle Clark, Elmira, NY (US);
Imaging & Sensing Technology Corporation, Horseheads, NY (US);
Abstract
A unique cathode (30) for an ultraviolet discharge lamp (10) is described. The cathode includes a triple-coil wire, i.e., the wire has a primary coil (43), a secondary coil (41) wound around the primary coil and a tertiary coil (36) wound around the secondary coil. The interstices of the primary coil and secondary coil, but not the tertiary coil, are occupied by a crystalline oxide emitter material. Filling the primary and secondary coils of the triple coil cathode provides a cathode having a greater amount of emitter material than prior art. In addition, as the outer layer of the emitter material sputters away from bombardment by positive ions, the remaining emitter material is protected by the now-exposed portion of the coil wire which protrudes beyond the remaining emitter material. Thus, incoming positive ions are apt to strike the exposed wire, and not the remaining emitter material.