Boston-based law firm Fish & Richardson is suing a former client that it says owes more than $2.2 million in fees.

Ann Cathcart Chaplin, managing principal of the firm's Minneapolis office, filed the complaint earlier this month.

In the suit, Fish & Richardson seeks more than $2.2 million in unpaid fees from former client Camtek, Ltd.-an Israel-based manufacturer of automated inspection systems for the electronics industry.

Bloomington-based August Technology Corporation sued Camtek in Minnesota in 2005 for infringing on one of its patents. August Technology was acquired by Rudolph Technologies, Inc., in 2006.

According to court documents, Camtek hired Fish & Richardson in October 2005 to represent it in the patent infringement suit, which was filed in U.S. District Court in Minnesota.

Camtek lost its case in March 2009 when a jury ruled that August Technology's patent was valid and Camtek had infringed. After the verdict, Camtek continued to request “substantial legal services” until September 2009, including client meetings and research related to the judgment, according to Fish & Richardson's complaint.

Camtek paid for the legal services that the firm provided between October 2005 and December 2008, according to the suit.

However, Camtek allegedly refused to pay fees due to the firm for services provided between January 2009 and October 2009, and it currently owes more than $2.2 million.

Monday calls to Camtek seeking comment on the case were not immediately returned.

Fish & Richardson operates offices in 11 cities throughout the United States and one in Germany. Most of its dealings with Camtek involved the firm's New York office.