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. 16, 2019
Filed:
Oct. 16, 2015
Applicant:
Abb Schweiz Ag, Baden, CH;
Inventors:
Claire Pitois, Sundbyberg, SE;
Elson Montibon, Oskarshamn, SE;
Fredrik Sahlen, Västerås, SE;
Lars Schimdt, Bonn, DE;
Orlando Girlanda, Västerås, SE;
Torbjorn Brattberg, Oskarshamn, SE;
Lars Wagberg, Stockholm, SE;
Assignee:
ABB Schweiz AG, Baden, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 27/32 (2006.01); D21H 17/36 (2006.01); D21H 17/37 (2006.01); D21J 1/20 (2006.01); H01B 3/18 (2006.01); H01B 3/44 (2006.01); H01B 3/52 (2006.01); D21H 17/56 (2006.01); D21H 17/00 (2006.01); H01F 27/00 (2006.01);
U.S. Cl.
CPC ...
D21H 17/36 (2013.01); D21H 17/375 (2013.01); D21H 17/56 (2013.01); D21J 1/20 (2013.01); H01B 3/185 (2013.01); H01B 3/447 (2013.01); H01B 3/448 (2013.01); H01B 3/52 (2013.01); H01F 27/32 (2013.01); D21H 17/00 (2013.01); H01F 27/00 (2013.01);
Abstract
A cellulose based pressboard for insulation in an electrical power transformer, the pressboard includes polyvinylamine (PVAm), and polyacrylamide (PAM), in a combined amount of between 0.01% and 20% by weight of the pressboard.