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. 27, 2004
Filed:
Dec. 15, 2000
Applicant:
Inventor:
Yasuhiko Takahashi, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 2/736 ; G11B 2/102 ;
U.S. Cl.
CPC ...
G11B 2/736 ; G11B 2/102 ;
Abstract
An electric current for writing low-frequency test data, or a direct current is applied to a magnetic recording head at a time point when data is not actually recorded, and a proper/improper operation of the magnetic recording head is detected by determining whether or not the terminal voltage of the head is within a predetermined range.