 From around 1807 a number of people looked to make artificial versions of this cement (or more strictly hydraulic lime as it was not burnt at fusion temperatures).Amongst these were James Frost who had about twenty patents from 1811 to 1822 including one for "British Cement" and Joseph Aspdin with his now famous patent for a method of making a cement he called "Portland cement".Between 1810 and 1820, after Parker's patent expired, "Roman" cement came into prominent use with numerous manufacturers.