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:
Nov. 30, 1993
Filed:
Jul. 08, 1992
Applicant:
Inventors:
Keizo Aramaki, Tajimi, JP;
Tomohiro Okumura, Tajimi, JP;
Assignee:
Tokyo Yogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22D / ;
U.S. Cl.
CPC ...
266220 ; 266217 ;
Abstract
A refractory for gas blowing to be attached to an opening of a molten metal refining vessel includes a gas permeable portion comprising an alumina refractory, the gas permeable portion having a plurality of gas blowing apertures running therethrough in the axial direction thereof, and a collar portion comprising an alumina refractory, formed integrally with the gas permeable portion so as to surround the gas permeable portion. The alumina refractory for both the gas permeable portion and the collar portion contains at least 88 wt. % alumina and is substantially non-porous with a porosity of up to 20%.