A US trade judge ruled on Friday that Google infringed five patents belonging to American audio equipment maker Sonos that concern smart speakers and related technology ? a decision that could lead to an import ban. The brief ruling from Charles Bullock, the chief administrative law judge of the US International Trade Commission, did not explain why Google ?s sale of the products violated a 1930 federal tariff law, commonly known as Smoot-Hawley, designed to prevent unfair competition. Sonos has been trying to block Google from importing Home smart speakers, Pixel phones and other products from China.