The Fourdriniers hired English engineer and manufacturer, Bryan Donkin, to make modifications to the Robert design. On August 14, 1807 Henry and Sealy Fourdrinier and John Gamble were granted a new British patent for "Prolonging the Term of Certain Letters Patent assigned to Henry and Sealy Fourdrinier for the Invention of making Paper by means of Machines."
". . .of the early pioneers who invented, developed, and financed the machine through the difficult years of its evolution, Louis Robert, Henry Fourdrinier, Didot St. Leger and Gamble, all died in comparative poverty. Robert died at 66 while managing a small school at Vernouillet, on the 28th August, 1828, leaving a wife and six children. Didot, who had returned to France, died in 1829 near the same village; and Henry Fourdrinier died on the 9th September, 1854, at the age of 88, . . . near Rugeley. John Gamble was still living in 1857, and there does not appear to be any authentic date of his death. These four men, who where so intimately connected with, and who gave so much of their lives and fortunes to, the development of the Fourdrinier machine, lived to see many successful paper-mills in which hundreds of paper-making machines were operating, from which they they themselves werre able to get nothing at all. The Bryan Donkin Company alone had built 197 paper-making machines before Henry Fourdrinier died, and by that time many other engineering firms were also building this type of machine. The Fourdrinier firm, of which Henry Fourdrinier was the head, lost at least £60,000 in the first ten years of the development of the machine, and became bankrupt in the process. Leger Didot lost his paper-mill and his business. Gamble lost his paper-mill at St. Neots to Matthew Towgood; and Robert was left completely out of it by everybody, and eventually got nothing but a statue and memorial many years after he died" (Clapperton, The Paper-making Machine. Its Invention, Evolution and Development  quote 12-3, see also 34-44).