Finnish cell phone maker Nokia Corp has said that it has extended its patent-infringement claims against Apple Inc to include the new iPad.The latest complaint, filed in US District Court in Madison, Wisconsin, follows other lawsuits by Nokia claiming that a broad swath of Apple products violate Nokia patents.Nokia says the disputed technologies help reduce the size and cost of electronic gadgets. Apple had already responded with its own infringement claims against Nokia.Lawsuits over patent rights are common in the technology industry. They can take years to resolve and often end with some kind of licensing agreement.In the meantime, consumers should be able to buy the Apple or Nokia products in question. Apple has also sued Taiwan's HTC Corp, one of the leading producers of cell phones that run on Google Inc's Android software, a potential challenger to Apple's popular iPhone.Apple says HTC's Android phones violate iPhone patents. The legal disputes come amid increasing competition in the fast-growing market for smart phones.Tech companies are scrambling to win over the growing number of consumers buying cell phones that come with e-mail, Web surfing and scores of apps for checking the weather, updating Facebook and other tasks. (Source DD)