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:
Jul. 20, 1976
Filed:
Jul. 16, 1975
Applicant:
Inventor:
Joseph A Gulotta, New Kensington, PA (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B / ;
U.S. Cl.
CPC ...
65 32 ; 65 6 / ; 65 9 / ; 6518 / ;
Abstract
A glass forming chamber in which glass is formed into a continuous sheet by floating it on the surface of molten metal is provided with a first protective atmosphere gas in an enclosed shell above a refractory roof in the chamber and with a second protective atmosphere gas in the headspace of the operating portion of the chamber in the vicinity of the glass being formed. The second protective atmosphere gas is more reducing than the first. For example, the first protective atmosphere gas may be nitrogen while the second protective atmosphere gas is a mixture of nitrogen and hydrogen.