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:
Nov. 23, 2004
Filed:
Jun. 07, 2001
Applicant:
Inventors:
John E. Heinz, Plymouth, MN (US);
Curtis B. Hause, St. Paul, MN (US);
Helen J. Yoo, Maplewood, MN (US);
Assignee:
Imation Corp., Oakdale, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/325 ;
U.S. Cl.
CPC ...
G11B 5/325 ;
Abstract
Methods and apparatus for erasing magnetic tape are described. The tape to be erased is fed through an erasure unit that includes an array of magnetic elements. The array of magnetic elements includes a first set of magnetic elements and a second set of magnetic elements. The magnetic fields for the respective first and second sets of magnetic elements have opposite polarity, as seen by the tape as it feeds through the erasure unit. The fields seen by the tape as it feeds through the erasure unit decrease in intensity.