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. 17, 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;
Hirohisa Iwabayashi, Himeji, JP;
USHIO DENKI KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A discharge lamp includes a cathode in a luminous tube, and an emitter, other than thorium, is added to the cathode. The emitter is prevented from being excessively vaporized from the cathode and depleted soon. Smooth lighting is enabled even at start-up. A main body part () of the cathode () is made from a metallic material having a high melting point and containing no thorium. A front end () is made from a metallic material having a high melting point and containing an emitter (excepting thorium). Inside a sealed space () formed in the main body part () and/or the front end part () is received a sintered compact () containing an emitter (excepting thorium) that is higher in concentration than the emitter contained in the front end part ().