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:
May. 26, 1998
Filed:
May. 28, 1996
Toshio Ohashi, Komaki, JP;
Sugio Miyazawa, Kasugai, JP;
NGK Insulators, Ltd., , JP;
Abstract
A method for producing a cylindrical ceramic body having a hollow portion and having an uneven thickness includes the steps of: granulating a ceramic material powder to obtain granules having an average diameter of 50-90 .mu.m and an apparent bulk density of 0.60-0.80 g/cm.sup.3 ; mixing a binder with the granules to obtain a molding material; subjecting the molding material to an injection molding under a pressure of 500 kg/cm.sup.2 or less to obtain a compact; removing a binder from the compact to obtain a binder-removed compact; and firing the binder-removed compact. The method can excellently mold and produce a cylindrical ceramic body which has a hollow portion therein, which is very thin, and which has an uneven thickness.