The Mannheim state court's ruling Friday follows similar decisions in Britain and the Netherlands.
The ruling can be appealed within 30 days.
Apple and its rivals are locked in a complex worldwide battle over patents and design rights covering the lucrative market for smartphones and tablet computers.
Last month a U.S. court ruled that Samsung phones and tablets infringe on Apple patents, and awarded the Cupertino, California, company $1.05 billion.
Meanwhile, Samsung is seeking royalties from Apple for sales of iPhones it says infringe on its patents.
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