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:
Apr. 01, 1980
Filed:
Dec. 26, 1978
Alexander Coucoulas, Bridgewater Township, Somerset County, NJ (US);
John R Nis, Hamilton Township, Mercer County, NJ (US);
Western Electric Company, Incorporated, New York, NY (US);
Abstract
A gas head extrusion apparatus (10), having upper (12) and lower (13) chambers, is arranged to feed glass particulate (60) into the upper chamber (12). The particulate (60) is heated to consolidate the particulate (60) into a first viscous melt (71) as an elevated gas pressure is simultaneously applied within the chamber (12). The first viscous melt (71) is urged through a narrow opening (16) in the bottom (14) of the upper chamber (12) into the lower chamber (13) to form a second viscous melt (73). The lower chamber (13) is pressurized to a second pressure, P.sub.2, where P.sub.1 >P.sub.2. Gas bubbles, having an internal pressure, P.sub.1, formed during the consolidation process in the upper chamber (12), will expand in the lower chamber (13) to facilitate removal thereof from the melt (73). The lower pressure, P.sub.2, also causes the melt (73) in the lower chamber (13) to be extruded through an annular opening (29), in the bottom of the lower chamber (13), to form a substantially bubble-free hollow glass tube (74).