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. 05, 1990
Filed:
Aug. 11, 1988
Gerhard Goessler, Oberderdingen, DE;
Abstract
In the case of an electric heater, particularly a radiant heater for glass ceramic hotplates, there are several spirally nested heating resistors, whereof one heating resistor continuously passes through in the central field in such a way that it forms two nested spirals (10, 17) distributed approximately uniformly over the entire heating field, but which are not directly adjacent to one another and instead between their spiral turns (20, 21) is provided at least one spiral turn of a further, spirally wired heating resistor. This makes it possible in simple manner to make the length of said first-mentioned heating resistor much larger, so that it has a very high rated power, but can still be safely laid or wired in the heating field without any risk of local overheating.