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:
Jan. 21, 1992
Filed:
Jan. 12, 1990
Applicant:
Inventor:
Virgle L Hedgcoth, Pomona, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
428611 ; 428 65 ; 428198 ; 428336 ; 428409 ; 428612 ; 428627 ; 428634 ; 428651 ; 428652 ; 428667 ; 428694 ; 428900 ; 428928 ;
Abstract
A magnetic thin film recording disk includes a substrate of a hard electroless plated nickel surface that has been textured to encourage a circular anisotropic orientation of crystal growth during a pass-by sputtering in a continuous production line. A thin film chromium nucleating layer that is substantially free of any oxidation that would affect the recording properties is subsequently deposited, and then a thin film magnetic layer of a cobalt alloy, having a desired circular anisotropic crystal growth, is deposited through the sputtering process. The resulting magnetic thin film recording disk is then coated with a thin film of a carbon protective material.