His son William's innovation was to make a mix with a higher limestone content, to burn it at a higher temperature using more fuel, and to grind the hitherto-discarded hard clinkered material, hence increasing wear-and-tear in the grinding process. However, William did not file for a patent on his modified process, and sometimes claimed his father's patent. In 1848, William moved south to Northfleet, in Kent, where inexhaustible supplies of soft chalk were available. A history of "financial missteps" and questionable business arrangements suggests that William may have been both inept and dishonest. Nonetheless, he is credited with launching the "modern" Portland cement industry.