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:
Nov. 11, 1986
Filed:
Mar. 29, 1985
Hartmut Michel, Heidenheim, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
An electric capacitor formed of dielectric layers provided on at least one side with metal layers with coatings, and wherein the layers are formed of partially crystallized and pre-shrunk polyethylene terephthalate. The coatings are alternately electrically conductively connected to metal layers applied by the Schoop process with opposing polarity to end faces of the capacitor body. The dielectric layers are arranged to form a stack or are deformed to form a flat-pressed winding. The polyethylene terephthalate dielectric layers have a degree of crystallization of at least 50%, in particular at least 55%, measured by differential thermo-analysis in order to determine the melting point enthalpy. In a method for production of such a capacitor, the capacitor bodies provided with the metal layers are subjected to an additional heat treatment in which the temperature is increased from room temperature to a final temperature of 200.degree. to 250.degree. C. for 1 to 5 hours. This final temperature is held for a period of 1 to 65 hours, where the length of this holding time is inversely proportional to the final temperature.