A U.S. Judge has said that Samsung's Galaxy tablets infringe on Apple's iPad patents, but also that Apple might have a problem establishing the validity of its patents. These comments are from U.S. District Judge Lucy Koh, which came on Thursday in a court hearing on Apple's request to bar some Galaxy products from being sold in the US. Apple and Samsung are currently duking it out in 10 countries with more than 20 cases currently on-going.

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Just yesterday, an Australian court barred the Galaxy Tab 10.1 from being sold in Australia. In April of this year, Apple sued Samsung in the US, saying that the South Korean-based company's Galaxy range of smartphones and tablets "slavishly" copies the iPhone and iPad. Fast-forward to July and Apple filed a request to bar some Samsung-branded products from sale in the US, including the Galaxy S 4G smartphone and Galaxy Tab 10.1.

Verizon Wireless and T-Mobile USA have both opposed Apple's request, saying that a ban on Samsung Galaxy products would hurt their holiday sales. Apple must now show that Samsung infringed on its patents and that its patents are valid under the law. Judge Koh also stated that she would deny Apple's request for an injunction based on one of Apple's so-called "utility" patents. She did not say whether she would grant the injunction based on three other Apple "design" patents.