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. 17, 1997
Filed:
Dec. 21, 1995
Peter Schoubye, H.o slashed.rsholm, DK;
Haldor Topsoe A/S, Copenhagen, DK;
Abstract
A method to provide a glass tube with an internal glass spiral being formed from a straight glass rod and fastened to the internal wall of the glass tube by merging the glass rod with the glass wall in the line of contact between the glass wall and the spiral wherein the glass rod is conducted into the glass tube through a guiding tube placed inside the glass tube at a velocity v.sub.1 relative to the guiding tube, the guiding tube being provided with a heating zone at its front end inside the glass tube, the glass rod being heated to its softening point in the heating zone before leaving the guiding tube through a mouth piece, at the same time the glass tube and/or the guiding tube being rotated at a frequency n, and the glass tube being moved at a velocity v.sub.2 relative to the guiding tube.