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. 30, 1985
Filed:
Jun. 08, 1984
Hiroshi Inoue, Kawaguchi, JP;
Katsutoshi Komeya, Oiso, JP;
Akihiko Tsuge, Yokohama, JP;
Kazunari Koide, Kariya, JP;
Masaaki Mori, Okazaki, JP;
Tetsuro Urakawa, Kariya, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Toshiba Ceramics Co., Ltd, Tokyo, JP;
Abstract
Disclosed is a process for preparing silicon nitride powder, which comprises baking a powdery mixture comprising (i) 1 part by weight of silica powder, or a silica-containing substance in terms of silica, (ii) 0.4 to 4 parts by weight of carbon powder, or a substance generating carbon by baking, in terms of carbon and (iii) 0.005 to 1 part by weight of silicon nitride powder synthesized by a silica reduction method, at a temperature of from 1350.degree. to 1550.degree. C. in a non-oxidative atmosphere containing nitrogen.