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:
Dec. 19, 1995
Filed:
Jul. 01, 1994
Applicant:
Inventor:
Shinji Ohtsubo, Nagoya, JP;
Assignee:
NGK Insulators, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B28B / ;
U.S. Cl.
CPC ...
264 66 ; 264 67 ;
Abstract
A method of manufacturing a ceramic part having a hollow portion and at least one hole extending through the ceramic part from the hollow portion to outside the ceramic part. The method includes the steps of molding a ceramic compact having the hollow portion, forming a hole in the ceramic compact, beveling an edge portion of the hole by passing a wire with a grindstone attached thereto into the hole from the hollow portion and then pulling a portion of the wire which has protruded from the hole while rotating the wire, and firing the ceramic compact.