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:
Jul. 21, 1992
Filed:
Jan. 04, 1990
Applicant:
Inventors:
Josef Bachmann, Heimbuchenthal, DE;
Wolfram Diemar, Clausthal-Zellerfeld, DE;
Assignee:
Leybold Aktiengesellschaft, Hanau, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F26B / ;
U.S. Cl.
CPC ...
34 / ; 34 / ;
Abstract
The invention relates to a power supply for the electric drying of transformer parts, particularly paper insulation of the windings. For this purpose, a converter is selected as a voltage source which converts an alternating voltage, e.g. alternating supply voltage of 50 Hz, into a variable frequency in the range of 0 and 25 Hz.