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:
Oct. 30, 2007
Filed:
May. 12, 2004
Applicants:
Lijie Guan, Milpitas, CA (US);
Hung Liang HU, Los Altos Hills, CA (US);
Yaw Shing Tang, Saratoga, CA (US);
Kochan Ju, Monte Sereno, CA (US);
Inventors:
Lijie Guan, Milpitas, CA (US);
Hung Liang Hu, Los Altos Hills, CA (US);
Yaw Shing Tang, Saratoga, CA (US);
Kochan Ju, Monte Sereno, CA (US);
Assignee:
Headway Technologies, Inc., Milpitas, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/127 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a single vertical pole magnetic writer, flux passing through the return pole can sometimes be strong enough to erase previously recorded data. This problem has been overcome by the addition of a second return pole that is magnetically connected to the conventional return pole for the purpose of collecting leaked flux, thereby preventing it from reaching the underlayer.