A German court has ruled that Motorola Mobility’s Xoom tablet doesn’t infringe on Apple’s iPad design, but rejected a claim by Motorola that the Apple tablet patent is invalid, reports “Dow Jones” (http://macte.ch/f7GgU).

This is part of an ongoing battle between the two companies. Apple has previously alleged that Motorola infringes 24 of its patents (21 of them with Android-based phones, the remaining three with set-top boxes and DVRs), while Motorola previously asserted 18 patents against a variety of Apple products (mostly but not exclusively iPhone, iPad and iPod). Litigation between the two companies has taken place in several different federal courts.

In November 2010 Apple sued Motorola, alleging that the company’s smartphone lineup and the operating software it uses infringe on the iPhone-maker’s intellectual property. The two lawsuits came after Motorola sued Apple in October 2010 for patent infringement. Motorola claims that Apple’s iPhone, iPad, iPod touch and certain Mac computers infringe Motorola patents.

Since the German court ultimately rejected both parties’ claims, it ordered Apple to pay two-thirds of costs and Motorola to pay a third, notes “Dow Jones.”