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:
Feb. 02, 2016
Filed:
Sep. 20, 2013
Applicant:
Stanley Electric Co., Ltd., Meguro-ku, Tokyo, JP;
Inventors:
Takahiro Matsumoto, Yokohama, JP;
Shigemi Suzuki, Tsukuba, JP;
Assignee:
STANLEY ELECTRIC CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01K 1/10 (2006.01); H01K 3/02 (2006.01); H01K 5/00 (2006.01);
U.S. Cl.
CPC ...
H01K 1/10 (2013.01); H01K 3/02 (2013.01); H01K 5/00 (2013.01);
Abstract
A filament using a high melting point metal compound such as tantalum carbide is provided. As the filament, a filament comprising a tungsten base material, a tantalum layer coating the tungsten base material, and a tantalum carbide layer coating the tantalum layer is used. The tantalum layer and the tantalum carbide layer may be replaced with a hafnium layer and a hafnium carbide layer, respectively, or may be formed of a combination of tantalum and hafnium.