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:
Oct. 15, 2002
Filed:
Aug. 30, 1999
Joachim Scherzer, Bruchköbel, DE;
Siegfried Grob, Hanau, DE;
Heraeus Noblelight GmbH, Hanau, DE;
Abstract
In the production of spiral-shaped heating elements, a device winds an oblong base material onto a mandrel while forming a spiral with the base material and equips the ends of the spiral with contacts for electrical connection. The device includes a feeding device for supplying the mandrel, onto whose casing surface the base material is wound in a spiral shape, with the oblong base material. In order to carry out a method for the production of a spiral-shaped heating element made of material containing carbon fibers, the method is as follows: utilize a base material that comprises carbon fibers which have been embedded into IBM a thermoplastic embedding compound, heat the base material to a temperature at which the embedding compound softens, wind the softened base material onto the mandrel while forming the spiral, and set the spiral shape by removing the embedding compound. On the device used to carry out the method, there is included a heating device which affects the base material in the area of the casing surface of the mandrel and can be adjusted to a temperature above the softening temperature of the embedding compound. The invented heating element, which distinguished itself due to its low thermal inertia and high radiation capacity at comparatively low temperatures, is formed in the shape of a spiral having a series of carbon fibers that are connected with each other.