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. 30, 2013
Filed:
Jun. 22, 2009
Markus Riedl, Mitterteich, DE;
Reiner Bartsch, Tischenreuth, DE;
Franz Voelkl, Friedenfels, DE;
Franz Jaeger, Tischenreuth, DE;
Karola Schneider, Maehring, DE;
Markus Riedl, Mitterteich, DE;
Reiner Bartsch, Tischenreuth, DE;
Franz Voelkl, Friedenfels, DE;
Franz Jaeger, Tischenreuth, DE;
Karola Schneider, Maehring, DE;
Schott AG, Mainz, DE;
Abstract
The glass tube assembly has an outer glass tube provided with a tapered section and an inner glass tube or rod, which is arranged inside of the outer glass tube and which has a spiral section. The tapered section is formed by one or more projections on the inner surface of the outer glass tube. Each projection extends in a longitudinal direction of the outer glass tube and does not extend around its entire circumference. The internal width of the tapered section is smaller than the outside diameter of the spiral section of the inner glass tube or rod, so that the inner glass tube or rod is reliably prevented from slipping or rotating out of the outer glass tube by its spiral section. A method of making the glass tube assembly is also described.