Transmeta has sued Intel claiming its Pentium and Core PC processors violate Transmeta patents.

The lawsuit alleges that Intel has violated ten patents covering processor design and power efficiency techniques and was filed yesterday in Delaware.

Transmeta is asking the court for damages, royalty payments, and an injunction barring Intel from selling infringing products. Intel's Pentium III, Pentium 4, Pentium M, Core and Core 2 processors violate the patents, Transmeta claims.

The lawsuit comes after the two companies failed to agree to licensing terms, said Transmeta CEO Arthur Swift. "Friendly win-win discussions between the two parties had broken down and we thought is was appropriate now to turn to the courts." These discussions had been occurring "off and on, for years," he said. An Intel spokesman declined to comment, saying that company lawyers had not yet had time to review the lawsuit.

Nine of the 10 Transmeta patents invoked in the lawsuit cover basic processor functions like scheduling and addressing instructions on the chip. The tenth patent relates to Transmeta's LongRun technology, which is used to adjust the voltage of the processor, depending on its workload.

Transmeta, founded in 1995, tried and failed to break Intel's stranglehold on the notebook PC market. The company developed software that reduced power consumption, allowing PCs to run longer, but the company's Crusoe processors never caught on with laptop buyers.

Lowering power consumption has become a more important issue for Intel, of late, and the chip-making giant has been battling rival AMD to develop faster and cooler microprocessors. Last year, Transmeta switched business models and now focuses on licensing its technology.