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:
Aug. 25, 1987
Filed:
Oct. 02, 1985
International Business Machines Corporation, Armonk, NY (US);
Abstract
A magnetic recording disk comprises a magnetic layer consisting of a binder and magnetic particles, a silicon substrate and abrasion-resistant material formed on the silicon substrate. The abrasion-resistant material is in the form of elevations which protrude from the silicon substrate and whose surface is coplanar with the surface of the magnetic layer. The abrasion-resistant elevations are formed on the substrate in a predetermined uniform distribution either after the surface of the substrate has been blanket doped and/or covered with a layer comprising aluminum as a main component, by tempering and optionally oxidizing; or after the surface of the substrate has been selectively doped, by etching off the undoped regions of the surface of the substrate.