Robert and Didot quarrelled over the ownership of the invention.
Robert eventually sold both the patent and the prototype machine to Didot for 25,000 francs.
 Didot defaulted on the payments to Robert, however, and he was forced to recover legal ownership of the patent on 23 June 1801.
 Didot wanted to develop and patent the machine in England, away from the distractions of the French Revolution, so he sent his English brother-in-law, John Gamble, to London.

In March 1801, after demonstrating continuous rolls of paper from Essonne, John Gamble agreed to share the London patent application with brothers Sealy and Henry Fourdrinier, who ran a leading stationery house.
Gamble was granted British patent 2487 on 20 October 1801 for an improved version of Robert's original machine.
 Thus the next development was financed by the London stationers.
Gamble and Didot shipped the machine to London, and after 6 years and approximately £60,000 of development costs, the Fourdriniers were awarded new patents.
An example of the Fourdrinier machine was installed at Frogmore, Hertfordshire.
Robert and Didot quarrelled over the ownership of the invention. Robert eventually sold both the patent and the prototype machine to Didot for 25,000 francs.  Didot defaulted on the payments to Robert, however, and he was forced to recover legal ownership of the patent on 23 June 1801.  Didot wanted to develop and patent the machine in England, away from the distractions of the French Revolution, so he sent his English brother-in-law, John Gamble, to London.
In March 1801, after demonstrating continuous rolls of paper from Essonne, John Gamble agreed to share the London patent application with brothers Sealy and Henry Fourdrinier, who ran a leading stationery house. Gamble was granted British patent 2487 on 20 October 1801 for an improved version of Robert's original machine.  Thus the next development was financed by the London stationers. Gamble and Didot shipped the machine to London, and after 6 years and approximately £60,000 of development costs, the Fourdriniers were awarded new patents. An example of the Fourdrinier machine was installed at Frogmore, Hertfordshire.
Louis-Nicolas Robert