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. 26, 2023
Filed:
Mar. 17, 2021
Applicant:
Hitachi Energy Switzerland Ag, Baden, CH;
Inventors:
Olof Hjortstam, Västerås, SE;
Fredrik Sahlen, Västerås, SE;
Elson Montibon, Ludvika, SE;
Anders Eriksson, Ludvika, SE;
Erik Keil, Fårbo, SE;
Assignee:
HITACHI ENERGY SWITZERLAND AG, Baden, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01B 3/52 (2006.01); H01B 3/20 (2006.01); H01F 27/32 (2006.01);
U.S. Cl.
CPC ...
H01B 3/52 (2013.01); H01B 3/20 (2013.01); H01F 27/321 (2013.01);
Abstract
A pressboard for high-voltage devices is disclosed. The pressboard has a density of 0.6-1.3 g/cmaccording to IEC60641-2, and includes 1-15% microfibrillated cellulose (MFC) based on the total dry weight of the pressboard. The pressboard also includes an insulation element. For example, the pressboard is impregnated with an electrically insulating compound. The insulation element may be used in a high-voltage device, such as a power transformer.