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1838 After closing his Kirkgate cement plant, Joseph moved his equipment to Kirkgate. William ran the plant.
1841 Joseph went into partnership with his elder son, James, and posted a notice that William had left, and that the company would not be responsible for his debts, stating "I think it right to give notice that my late agent, William Aspdin, is not now in my employment, and that he is not authorised to receive any money, nor contract any debts on my behalf or on behalf of the new firm."
1843 William established his own plant at Rotherhithe, where he introduced a new and substantially stronger cement, using a modified recipe for cement-making, the first "modern" Portland cement.
1852 William Aspdin, of Blackwall, Gateshead-upon-Tyne, in the county of Durham,Cement Manufacturer, has given the like notice in respect of the invention of "improvements inthe manufacture of Portland and other cements."
1855 Aspdin, Ord and Co was bankrupt.