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. 14, 1992
Filed:
May. 29, 1991
Applicant:
Inventors:
Franz Ott, Mitterteich, DE;
Reinhard Mannl, Mitterteich, DE;
Assignee:
Schott Glaswerke, Mainz, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B / ;
U.S. Cl.
CPC ...
65 87 ; 65187 ; 65191 ;
Abstract
Methods of an apparatus for producing profiled glass tubing utilizing the Danner process comprise flowing the molten glass over profiled blowpipe heads which are 'super-profiled' in that the angles of ridges and grooves are more acute than the ridges and grooves resulting in the glass tubing. The particular profiles of the glass tubing are controlled by selecting the necessary drawing speed, viscosity of the glass, internal air pressure at the blowpipe head and throughput rate of the glass melt.