Spex Technologies, Inc. v. Western Digital Corporation, No. 20-1283 (Fed. Cir. May 28, 2021)

From the Opinion

The passage below is extracted verbatim from the opening of the document. It has not been editorially summarized — consult the full opinion for the court's complete reasoning.

SPEX Technologies, Inc. (“SPEX”) charged Western Digital Corporation, Western Digital Technologies, Inc., and HGST, Inc. (collectively “Western Digital”) with in- fringing claims 1, 2, 6, 7, 11, 12, 23, and 25 of U.S. Patent No. 6,088,802 (“the ’802 Patent”).1 In its claim construction order, the United States District Court for the Central Dis- trict of California held that claims 6, 7, 23, and 25 were indefinite because the specification failed to provide corre- sponding structure for a mean s-plus-function limitation . SPEX Techs., Inc. v.