https://www.reuters.com/article/us-ericsson-patents-samsung/patents-and-royalties-battle-with-samsung-hits-ericsson-shares-idUSKBN28L0MX >Ericsson has filed a lawsuit in the United States against Samsung in a dispute over royalty payments and patent licences, sending Ericsson's shares sharply lower on Friday as it warned the quarrel could hit earnings.