Desperate for cash to tide it over until sales ramp up of new products, Nokia Oyj is stepping up its quest for royalties from rivals using its designs as the basis of their technology. Nokia already earns 500 million euros ($647 million) a year from its patent royalties in key areas of mobile telephony and some analysts say a more determined application of its patent rights could boost its income by hundreds more millions of euros a year. Alternatively, a sale could generate billions of euros.