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:
Jan. 08, 1991
Filed:
Feb. 21, 1989
Kazuo Ogino, Hinode, JP;
Hoya Corporation, Tokyo, JP;
Abstract
In a method of and an apparatus for melting glass having high reducing activity when melted, a glass raw material charged into a melting vessel having a wall formed of platinum or alloy thereof is heated and melted. Oxygen gas is supplied to an outer surface of the melting vessel to raise oxygen partial pressure within an atmosphere surrounding the melting vessel. The oxygen gas is caused to penetrate through the wall of the melting vessel, thereby supplying the penentrated oxygen to a layer of the molten glass which is in contact with an inner surface of the wall of the melting vessel, so that the layer of the molten glass is formed into a protective glass layer rich in oxygen, for protecting the wall of the melting vessel from the molten glass.