WASHINGTON -- The US Supreme Court will use a patent infringement dispute over automotive gas pedals to decide when some inventions are too obvious to qualify for a patent. The justices agreed to hear KSR International Co.'s bid to stop a suit over adjustable gas pedals originally filed against it by Teleflex Inc., which has since sold its auto pedal business. KSR says the Teleflex patent isn't valid because the technology was merely a combination of existing inventions. The Bush administration urged the court to grant a review. The case may alter how patents are issued and make it easier to challenge them in courts. Yesterday's court action follows a May 15 ruling that made it harder to block sales of infringing products. Companies such as software maker Microsoft Corp.