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:
Nov. 12, 1991
Filed:
Feb. 26, 1991
Applicant:
Inventors:
Kagetaka Ichikawa, Shiojiri, JP;
Takao Noda, Shiojiri, JP;
Assignee:
Showa Denko K.K., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F27D / ; C04B / ;
U.S. Cl.
CPC ...
264 65 ; 501 87 ; 501 96 ; 501 98 ; 423290 ; 264332 ;
Abstract
A method for producing a high density boron nitride sintered body includes mixing high purity hexagonal boron nitride powder with 0.1 to 20% by weight of at least one alkaline earth metal, then shaping the resultant mixture and firing the resultant shaped body in a non-oxidizing atmosphere containing nitrogen.