The four asserted patents, which describe recording methods and file management for devices using flash memory, were each issued by the U.S. Patent and Trademark office between February 1996 and November 1998.

The suits seek a permanent injunction from further alleged infringement, damages and plaintiff's costs.

The patent “claims a record and playback device that records digital audio onto removable flash memory,” said James Sze, an attorney representing e.Digital. “We are hoping to either eliminate the infringement of the patent or to have a license in place which will protect the inventions.”

He said e.Digital may pursue claims against other companies that it believes are infringing the patents.

“We certainly think there is a large number of infringers and we may be missing some,” said Douglas Olson, another attorney representing e.Digital.

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