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:
Dec. 23, 2003
Filed:
Sep. 13, 2001
Kiyomi Ejiri, Kanagawa, JP;
Minoru Sueki, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagwa, JP;
Abstract
A magnetic recording medium having on a support at least two magnetic layers that include an uppermost magnetic layer for recording information and a lower magnetic layer for recording servo signals, wherein the uppermost magnetic layer has a coercive force Hc(U) [KA/m] at most 265 times as much as a saturated magnetic flux density Bs[T] of a recording head used for information recording and the lower magnetic layer has a coercive force Hc(L) [KA/m] at least 159 times as much as the saturated magnetic flux density Bs[T] of the recording head used for information recording, thereby ensuring highly accurate servo write and elevation of recording density.