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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.:

US 5677051 B1

PDFFull Text
Date of Patent:
Oct. 14, 1997

Filed:

May. 21, 1996

Magnetic recording medium having a specified plasma polymerized hydrogen

Applicant:
Inventors:

Kunihiro Ueda, Saku, JP;

Masatoshi Nakayama, Sakura, JP;

Kiyoshi Yazu, Hodonoharano-machi, JP;

Koji Kobayashi, Miyota-machi, JP;

Hiromichi Kanazawa, Saku, JP;

Assignee:

TDK Corporation, Tokyo, JP;

Attorney:

Yee; Stephen F. K.

Primary Examiner:

Stevan A Resan

Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428336 ; 428408 ; 428446 ; 428457 ; 428422 ; 4286 / ; 4286 / ; 4286 / ; 428900 ; 427122 ; 427131 ; 427249 ; 427577 ; 427578 ; 427585 ;
Abstract

A magnetic recording medium possessing excellent electromagnetic characteristics, corrosion resistance, durability, abrasion resistance and lubricity, has an undercoat layer, a ferromagnetic metal layer, a protective layer and a lubricating layer formed in this order on a non-magnetic substrate, or has an undercoat layer, a ferromagnetic metal layer, an intercepting layer, a protective layer and a lubricating layer formed in this order on a non-magnetic substrate, wherein the protective layer is a plasma-polymerized hydrogen-containing carbon film having a refractive index of 1.90 or more and a contact angle of less than 80 degrees, the film thickness of the protective layer or the total film thickness of the protective layer and the intercepting layer is 30 to 150 .ANG., the undercoat layer, as well as the intercepting layer, is a film formed of silicon oxide represented by SiOx (x=1.8-1.95), and the lubricating layer is formed of a compound selected from the group consisting of polar perfluoropolyethers, non-polar perfluoropolyethers, perfluorocarboxylic acids, phosphazens, perfluoroalkylates and perfluoroacrylate compounds; and a method for producing the recording medium.

Find Patent Forward Citations

Ueda, Kunihiro. (1997). Magnetic recording medium having a specified plasma polymerized hydrogen (U.S. Patent No. 5677051). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5677051

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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