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:
Jul. 22, 2003
Filed:
Jun. 13, 2000
Ushiodenki Kabushiki Kaisha, Tokyo, JP;
Abstract
A lamp seal ( ) of functionally gradient seal material and a lead bar ( ) that is fixed to the seal piece ( ), which seal piece is formed an inorganic layer with insulative properties and a number of mixed layers that are each mixtures of conductive inorganic materials and insulative inorganic materials, such that the proportion of conductive inorganic materials increases gradually in the direction of layering. A hole is formed extending in the direction of layering such that the lead bar can be fixed into the seal material with a sleeve-shaped metallic part made of a high-melting-point metal separating the outer periphery of the lead bar from the seal material. A lamp made with an air-tight seal formed of that lamp seal of functionally gradient material.