HeidelbergCement AG has extended its deadline for purchasing the remaining shares in cement maker Teutonia Zementwerk AG by two weeks, a company spokesman said. The company’s voluntary takeover bid for Teutonia originally expired today.  HeidelbergCement now holds 77.67 per cent of the voting rights and 56.22 per cent of the share capital of Teutonia.  The target is to obtain 100 per cent of the cement maker, the spokesman said.