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. 12, 1980
Filed:
Mar. 06, 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:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; B24B / ; G11B / ;
U.S. Cl.
CPC ...
156154 ; 29603 ; 51310 ; 51312 ; 65 36 ; 65 43 ; 65 61 ; 156247 ; 156344 ; 360120 ; 360121 ; 360126 ; 428900 ;
Abstract
A process for the manufacture of pole structures for magnetic transducing heads is described in which the configuration of the non-magnetic gaps is formed by abrading the ferrite pole structure through a mask to erode recesses in the gap area which have inclined walls. The final dimension of the gap defining face of one or the magnetic elements is determined by removing material from the masked face of the structure until the dimension between the recesses has the desired value.