Less than a week after EMC accused the company of patent infringement, Hitachi has filed a counter suit.
The complaint against EMC, filed in the US District Court in Oklahoma, contends that it infringed eight Hitachi patents in products used in EMC's key Symmetrix and Clariion product lines.
EMC's suit, filed with the US International Trade Commission and a US District Court, had accused Hitachi of six patent infringements.
Like EMC's suit, Hitachi is also asking for damages and for the court to issue an injunction to keep EMC from selling the products in question until the case has been resolved.
EMC had asked the ITC to ban imports of the Hitachi HORC (Hitachi Open Remote Copy) and HOARC (Hitachi Open Asynchronous Remote Copy) software.
The suit is a quick escalation of the worsening relations between the two storage companies.
"Hitachi has no choice but to fight back with its own extensive patent portfolio in this field," said Isao Ono, senior corporate officer and senior group executive at Hitachi, in a statement.
The firm has also denied EMC's claims of copyright infringement, while for its part EMC claims it was forced to file suit following four years of frustrated negotiations with Hitachi.
EMC dismissed the Hitachi suit. "It's common for defendants to make up counter claims. The timing speaks for itself," said EMC spokesperson Mark Fredrickson.
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