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:
Apr. 22, 1980
Filed:
Jan. 16, 1978
Applicant:
Inventors:
Peter C Ridgway, Staines, GB;
Derek F Case, Sunbury on Thames, GB;
Assignee:
Data Recording Instrument Company Limited, Staines, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
148120 ; 148121 ;
Abstract
A process for producing magnetic elements is disclosed in which magnetic material having a low copper content is utilized and, prior to deposition of copper for acting as a non-magnetic spacer, a layer of isolating material such as nickel is deposited to isolate the copper from the magnetic material so that, after mechanical working of the magnetic material to form an element and the element is annealed to restore its initial magnetic properties, the isolating layer acts to prevent the magnetic properties of the magnetic material from being degraded by the copper layer.