UPDATE 3-US judge: Samsung tablets infringe Apple patents
* Apple seeks U.S. bar on some Samsung Galaxy products
* Hearing in California follows earlier Australia order
* Samsung tablets infringe Apple patents-judge
* Apple has a problem establishing patent validity-judge
* Apple must show both patent infringement and validity (Adds further detail from court, Samsung statement)
By Dan Levine
SAN JOSE, Calif., Oct 13 (Reuters) - A U.S. judge said Samsung Electronic's Galaxy tablets infringe Apple Inc's iPad patents, but also that Apple has a problem establishing the validity of its patents.
The comments from U.S. District Judge Lucy Koh came on Thursday in a court hearing on Apple's request to bar some Galaxy products from being sold in the United States.
Apple and Samsung are engaged in a bruising legal battle that includes more than 20 cases in 10 countries as the two jostle for the top spot in the smartphone and tablet markets.
Earlier on Thursday, an Australian court slapped a temporary ban on the sale of Samsung's latest computer tablet in that country.
Apple sued Samsung in the United States in April, saying the South Korean company's Galaxy line of mobile phones and tablets "slavishly" copies the iPhone and iPad.
Apple then filed a request in July to bar some Samsung products from U.S. sale, including the Galaxy S 4G smartphone and the Galaxy Tab 10.1 tablet.
Mobile providers Verizon Wireless and T-Mobile USA have opposed Apple's request, arguing that a ban on Galaxy products would cut into holiday sales.
Apple must show that Samsung infringed its patents and that its patents are valid under the law.
Samsung attorney Kathleen Sullivan argued that in order to defeat an injunction bid, Samsung need only show that it has raised strong enough questions about the validity of Apple's patents.
"We think we've clearly raised substantial questions," Sullivan said at the hearing on Thursday in a San Jose, California federal court.
Apple attorney Harold McElhinny said Apple's product design is far superior to previous tablets, so Apple's patents should not be invalidated by designs that came before.
"It was the design that made the difference," McElhinny said.
Koh frequently remarked on the similarity between each company's tablets. At one point during the hearing, she held one black glass tablet in each hand above her head, and asked Sullivan if she could identify which company produced which.
"Not at this distance your honor," said Sullivan, who stood at a podium roughly ten feet away.
"Can any of Samsung's lawyers tell me which one is Samsung and which one is Apple?" Koh asked. A moment later, one of the lawyers supplied the right answer.
"It took a long time to make that distinction," Koh said.
After the hearing, Samsung spokesman Kim Titus said Apple's injunction request is "groundless." An Apple representative did not immediately respond to a request for comment.
Additionally, Koh said 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.
Koh characterized her thoughts on the utility patent as "tentative" but said she would issue a formal order "fairly promptly."
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