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. 12, 1992
Filed:
Jan. 11, 1991
Applicant:
Inventors:
Hidenobu Misawa, Nagoya, JP;
Satoru Yamada, Nagoya, JP;
Assignee:
NGK Insulators, Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ;
U.S. Cl.
CPC ...
264 67 ; 264150 ; 26417711 ; 26417714 ;
Abstract
A method for manufacturing an one-end closed ceramic double tube, which includes the steps of extruding a ceramic double tube having inner and outer cylinders, drying the ceramic double tube, forming at least one passage in one end of the inner cylinder of the ceramic double tube so as to communicate an inner space of the inner cylinder with a gap formed between the inner cylinder and the outer cylinder, sealing the one end of outer cylinder proximate the one end of the inner cylinder, and firing the ceramic double tube.