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:
Jun. 13, 1978
Filed:
Aug. 29, 1977
Applicant:
Inventor:
Frank J Lazet, Media, PA (US);
Assignee:
PQ Corporation, Valley Forge, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C03B / ; C03B / ;
U.S. Cl.
CPC ...
65 90 ; 65-5 ; 65 16 ; 65 21 ; 65 83 ; 65 9 / ;
Abstract
A free-falling curtain of molten glass that is uniform in thickness and temperature is formed by flowing the glass over the lip of a forehearth after conditioning the glass in said forehearth. The forehearth is constructed to provide an increasing rate of fall as the glass travels, flows from the furnace through the forehearth and progressively cools. The floor of the forehearth is essentially the mirror image of the viscosity versus temperature curve of the material being treated. Other molten materials that become viscous as they cool can also be treated by the method of my invention to provide a uniform falling curtain of said material.