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:
Feb. 10, 1981
Filed:
Aug. 10, 1979
Applicant:
Inventor:
John R Cartwright, Letchworth, GB;
Assignee:
Data Recording Instrument Company Limited, Staines, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
29603 ;
Abstract
A method of forming a magnetic ferrite element for the core of a magnetic transducing head is disclosed in which spacers for determining the length of a non-magnetic gap are formed by providing a masking layer at locations on a surface of the element at which the spacers are required and eroding away the masking layer and the unmasked portions of the surface by an ion beam to produce a new surface having a spacer projecting at each of the locations by a distance determined by the relative rates of erosion of the ferrite and the masking material and by the predetermined thickness of the masking layer.