Dexter Magnetic Technologies Assigned Patent

Dexter Magnetic Technologies, Inc., Elk Grove Village, IL, has been assigned a patent (8,520,333) developed by Chun Li, Plainview, NY, for a “magnetic structure for erasing disk or disks within HDD drives.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A structure for erasure of magnetic media in a HDD includes a main field pole magnet polarized in a direction toward a drive spindle motor in the HDD. At least two quadrature magnets are disposed adjacent the main field pole magnet and polarized in a direction toward the main field pole magnet. The main field pole magnet and the at least two quadrature magnets are shaped to provide a slot for insertion of the magnetic media. At least two inverse polarity magnets are disposed on portions of the main pole and quadrature magnets forming the slot. The inverse polarity magnets are polarized in a direction opposed to the direction of the main field pole magnet.”

The patent application was filed on April 11, 2011 (13/084,012).