 His second patent in 1796 ""A certain Cement or Terras to be used in Aquatic and other Buildings and Stucco Work"", covers Roman cement, a term used in a 1798 pamphlet advertising his cement.He set up his manufacturing plant on Northfleet creek, Kent.It seems that he sold his patent to Samuel Wyatt who with his cousin Charles Wyatt produced cement in the name of Parker & Wyatt.