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. 14, 1989
Filed:
Nov. 25, 1986
Applicant:
Inventors:
Kyuzo Nakamura, Yachimata, JP;
Yoshifumi Ota, Yachimata, JP;
Taiki Yamada, Narita, JP;
Michio Ishikawa, Yachimata, JP;
Noriaki Tani, Yachimata, JP;
Assignee:
Nihon Shinku Gijutsu Kabushiki Kaisha, Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428408 ; 427131 ; 428694 ; 428695 ; 428900 ;
Abstract
An abrasion resistant magnetic recording member having a carbonaceous surfacial protective film for protecting a surface of a magnetic film formed on a substrate, and the carbonaceous surfacial protective film is formed of a lower layer comprising a comparatively hard carbonaceous film and an upper layer comprising a comparatively soft carbonaceous film.