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:
May. 25, 1976
Filed:
Feb. 12, 1973
Applicant:
Inventor:
Carl-Artur Akerblom, Vasteras, SW;
Assignee:
Allmanna Svenska Elektriska Aktiebolaget, Vasteras, SW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ; H01L / ;
U.S. Cl.
CPC ...
148113 ; 148 27 ; 148 315 ; 148 / ; 427126 ; 2523 / ;
Abstract
Electrical products formed of silicon steel are provided with a heat resistant electrical insulating coating by suspending particles of an oxide and/or of an hydroxide of earth alkali metal in an aqueous suspension, and adding to the suspension a substance capable of liberating hydroxyl ions which is volatile at a temperature below that at which silicate is formed. Examples of such a substance are ammonia and organic amines. There may also be added to the suspension silicon dioxide particles which are capable of oxidizing silicon to silicon dioxide at temperatures below 1300.degree.C.