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United States Utility Patents
6,801,490 - 6,801,499

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NumberTitle
6,801,490 Optical recording medium, device and method for recording optical recording medium, and device and method for reproducing optical recorded medium
6,801,491 Focus error detecting apparatus of optical pickup with a light separating and astigmatism generation optical element and detection method thereof
6,801,492 Solid immersion mirror type objective lens and optical pickup device adopting the same
6,801,493 Optical pickup device
6,801,494 Multiple sections for dual-layer optical recording medium
6,801,495 High capacity robust modem for multiple classes of services
6,801,496 Network addressing scheme for reducing protocol overhead in an optical network
6,801,497 Method to provide a management channel, a line terminator, a first network terminator card and a second network terminator card realizing such a method and an access network
6,801,498 Asynchronous transfer mode communication equipment and method for switching virtual path of same
6,801,499 Diversity schemes for packet communications



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