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:
Apr. 25, 2017
Filed:
Jun. 17, 2014
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Yukiharu Tagawa, Himeji, JP;
Tomoyoshi Arimoto, Himeji, JP;
Mitsuo Funakoshi, Himeji, JP;
Yukio Yasuda, Himeji, JP;
Yuki Otoshima, Himeji, JP;
Hirohisa Iwabayashi, Himeji, JP;
USHIO DENKI KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A discharge lamp includes an emitter other than thorium, which is added to a cathode in a luminous tube. Early depletion of the emitter due to excessive vaporization of the emitter from the cathode is prevented, while achieving stable lighting even at the start-up of the lighting. A main body part () of the cathode () is made from a high-melting-point metal material that contains no thorium, and a front end part () thereof is made from a high-melting-point metal material that contains an emitter (other than thorium). A sintered compact (), which contains an emitter (other than thorium) at a concentration higher than the emitter contained in the front end part (), is buried in a sealed space () that is formed within the main body part () and/or the front end part (). The sintered compact () abuts against the front end part ().