A US district judge has ruled that Intel's high-performance Itanium chip infringed on patents held by services company Intergraph.
But Intel's total liability is limited to $250m because of a previous agreement reached as part of another patent spat between the companies.
Intergraph claimed Intel's Itanium processor infringed on two patents related to parallel instruction computing.
In a 22-page ruling, Judge T. John Ward found the Intergraph patents to be valid and enforceable.
He added that Intergraph was entitled to an injunction that would halt the sale of Itanium processors, which Intel spent $1bn to develop over 10 years.
But under the deal reached in April, Intel agreed it would pay $150m to stay an injunction if it lost the case. If Intel appeals and loses, it will have to pay another $100m to license the technology.
According to Associated Press reports Intel has said it is planning to appeal the decision.
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