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. 29, 1980
Filed:
Jun. 06, 1978
Applicant:
Inventors:
Tomio Kobayashi, Tagajo, JP;
Hidesuke Miyairi, Rihu, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C25F / ; C25F / ;
U.S. Cl.
CPC ...
20412965 ; 20412995 ;
Abstract
A method of electrolytically etching a ferrite body wherein the body is immersed in an etching electrolyte of controlled concentration, an electrode is positioned in the electrolyte in spaced relation to the body, with the ratio of exposed surface area of the ferrite body and the confronting surface area of the electrode being within a predetermined range, and applying a unidirectional voltage between the ferrite body and the electrode, the ferrite body being at a negative voltage relative to the electrode for a sufficient time to cause the desired etching.