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. 05, 1977
Filed:
Jan. 23, 1975
Kenzo Susa, Hachioji, JA;
Toshio Kobayashi, Kokubunji, JA;
Satoshi Taniguchi, Tokorozawa, JA;
Mitsuru Ishii, Higashi-yamato, JA;
Hitachi, Ltd., , JA;
Abstract
In synthesizing cubic boron nitride from hexagonal boron nitride under high temperature and high pressure conditions, if water is incorporated into the raw material in an amount of at least 3% by weight, cubic boron nitride of a higher purity in the form of smaller crystallites than in conventional products can be obtained under lower temperature and lower pressure conditions than in conventional methods. When graphitic hexagonal boron nitride is used as the raw material, the temperature and pressure necessary for synthesis can be reduced to about 600.degree. C. and 50 Kbar, respectively.