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PASADENA, Calif. (Reuters) - Online DVD rental company Netflix Inc. sued rival Blockbuster Inc. for patent infringement Tuesday, asking a federal judge in Northern California to shut down Blockbuster's 18-month-old online rental service and award Netflix damages, according to a copy of the filing.

Netflix, which was founded in 1999, holds two U.S. patents for its business methodology, which calls for subscribers to pay a monthly fee to select and rent DVDs from the company's Web site and to maintain a list of titles telling Netflix in which order to ship the films, according to the patents, which were included as exhibits in the lawsuit.

The first patent, granted in 2003, covers the method by which Netflix customers select and receive a certain number of movies at a time, and return them for more titles.

The second patent, issued Tuesday, "covers a method for subscription-based online rental that allows subscribers to keep the DVDs they rent for as long as they wish without incurring any late fees, to obtain new DVDs without incurring additional charges and to prioritize and reprioritize their own personal dynamic queue -- of DVDs to be rented," the lawsuit said.

The lawsuit says No. 1 U.S. rental chain Blockbuster, which launched its online rental service in 2004, was aware that Netflix had obtained a patent for its business method and was seeking a second, but willfully and deliberately violated the existing patent.

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