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:
Feb. 08, 2022
Filed:
Aug. 24, 2018
Leoni Kabel Gmbh, Roth, DE;
Wolfgang Hämmerle, Jena, DE;
Jörg Kötzing, Jena, DE;
LEONI KABEL GMBH, Roth, DE;
Abstract
The invention relates to a method for producing a glass-fibre preform with a core of a polygonal cross section by using a rod-in-tube method and comprising the method steps of: providing a core rod () of a polygonal core rod cross section (), producing a sectored sandwich tube () from a starting tube (), wherein the lateral surface of the starting tube () is slit in the longitudinal direction into a series of outer segments (), and so the tube cross section of the starting tube () is subdivided into a series of sectors of a circle (), inserting the core rod () into the sectored sandwich tube () and aligning it and, in the case of one embodiment, inserting the core rod () and the sectored sandwich tube () into an outer casing tube () with a complete annular cross section and melting the sectored sandwich tube () and possibly the outer casing tube () onto the sectored sandwich tube (), wherein the outer segments () of the sectored sandwich tube () are fused to the respective side surfaces () of the core rod ().