The US International Trade Commission (ITC) is looking into allegations that Nintendo has infringed the patents of a company called Hillcrest Laboratories with its hugely popular Wii games console.
Hillcrest claims that Nintendo has infringed four of its patents with Wii.
UPDATE - Nintendo has issued a response to Hillcrest's accusations of patent infringement:
"Nintendo respects the intellectual property rights of other companies, and believes that none of its products infringes the Hillcrest Laboratories patents. Nintendo intends to vigorously defend this action."