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:
Mar. 10, 2009
Filed:
Apr. 05, 2005
Jason A. Christianson, Apple Valley, MN (US);
Michael John O'brien, St. Paul, MN (US);
Cameron Carroll Rabe, Inver Grove Heights, MN (US);
Carl F. Elliott, Eden Prairie, MN (US);
Jason A. Christianson, Apple Valley, MN (US);
Michael John O'Brien, St. Paul, MN (US);
Cameron Carroll Rabe, Inver Grove Heights, MN (US);
Carl F. Elliott, Eden Prairie, MN (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
An apparatus and method for providing electrostatic discharge protection for a disc drive read head. A pair of depletion mode MOSFETS, and a fuse associated with each are disposed between the read head output terminals. The MOSFETS are controlled to an 'off' state for testing the preamplifier prior to assembly of the read head. After assembly of the head, a second pair of MOSFETS is gated to an 'on' state to open the fuses and thus permit normal operation of the read head.