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ARTICLE · 26 SEPTEMBER 2012

Broad Claim Language Must Be Enabled Across Its Full Scope of Coverage

Finnegan, Henderson, Farabow, Garrett & Dunner LLP
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In MagSil Corp. v. Hitachi Global Storage Technologies, Inc., No. 11-1221 (Fed. Cir. Aug. 14, 2012), the Federal Circuit affirmed the district court’s grant of SJ of invalidity for lack of enablement of U.S. Patent No. 5,629,922 ("the ’922 patent"), assigned to the Massachusetts Institute of Technology and exclusively licensed to MagSil Corporation ("MagSil").

United StatesIntellectual Property
Finnegan, Henderson, Farabow, Garrett & Dunner, LLP
Finnegan, Henderson, Farabow, Garrett & Dunner, LLP
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In MagSil Corp. v. Hitachi Global Storage Technologies, Inc., No. 11-1221 (Fed. Cir. Aug. 14, 2012), the Federal Circuit affirmed the district court's grant of SJ of invalidity for lack of enablement of U.S. Patent No. 5,629,922 ("the '922 patent"), assigned to the Massachusetts Institute of Technology and exclusively licensed to MagSil Corporation ("MagSil"). 

The '922 patent relates to read-write sensors for computer hard disk drive storage systems.  The sensors use a quantum mechanical effect where the electric current can tunnel from one electrode through a thin insulating barrier layer into a second electrode.  With two ferromagnetic electrodes, the tri-layer tunnel resistance changes with a change in magnetization direction.  The '922 patent claims a method of manufacturing a tri-layer tunnel junction and the junction itself.  The asserted claims, however, only claim the tunnel junction device. 

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