PORTLAND — Maine-based DeLorme Publishing is digging in for a fight against a $6.2 million fine levied against it in an ongoing patent dispute.

The Portland Press Herald reports DeLorme’s CEO says the firm believes it’s done nothing wrong and will appeal. The mapping company received the fine from the International Trade Commission on June 10 for violating a consent order related to a patent infringement case brought by a Virginia company.

The fine concerns DeLorme’s line of hand-held satellite communication devices, which CEO Michael Heffron says accounts for half the company’s roughly $20 million annual revenue.

Yarmouth, Maine-based DeLorme employs 75 people. BriarTek of Virginia claims DeLorme is infringing on its patent by manufacturing two-way satellite communication devices. DeLorme officials claim BriarTek’s patent is invalid. The case is in court.

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