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:
Oct. 26, 1999
Filed:
Jul. 22, 1998
Applicant:
Inventors:
Shigeki Maekawa, Tokyo, JP;
Megumi Takemoto, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C / ;
U.S. Cl.
CPC ...
75248 ; 419-3 ; 419-4 ; 419 28 ; 419 29 ;
Abstract
A primary product comprising tungsten or molybdenum accommodated in a container 1 is heated at 500.degree. C. with 1000 atmospheric pressure in an Ar gas atmosphere and retained for 1 hour. According to the present invention, the crystal orientation in the (110) face can be 99% or more, and thus a material with a good electron radiation characteristic can be obtained.