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:
Sep. 13, 1994
Filed:
Mar. 16, 1993
Helmut Gsellmann, Graz, AT;
Abstract
A thermally expanding laminate contains highly elastic reinforcing fibers, such as glass fibers, in the elastically compressed state, and a thermally softening, thermosetting plastic as a binder. In order to manufacture this laminate, first glass fiber mats are impregnated with a thermosetting plastic and thereupon one or more superposed mats are compressed in a press and raised to temperatures such that the plastic shall soften and the assembly then is cooled while still being compressed and while the plastic is solidifying to form the finished laminate. The expandable laminate preferably is used for electrically insulating spacers. Illustratively a laminate blank 4 is mounted between neighboring coil parts 5 of a stator of an electrical high-voltage machine. In the ensuing vacuum-pressure molding, which is conventional per se, of the stator to complete the soil insulation, the laminate blanks 4 are heated by the hot impregnation-soaking medium, the plastic of the laminate blanks being softened and these blanks then expand on account of the decompression of their compressed fiber material and entirely fill the gaps between the coil parts 5. The soaking medium totally filling the laminate pores then is jointly cured with the plastic of the laminate with the stator insulation.