Maurice De Jongh
Maurice De Jongh (1774-1853) of Warrington, later moving to France.
Note: Researchers should note that publishers were often careless or indifferent to the spelling of Jongh, favouring 'Jough' or 'Iongh' instead.
Cotton spinner, merchant, and inventor.
Genealogy forum discussions reveal that he was born as Moshe (De Jongh) Rintel, son of Ezechiel, on 17th May 1774 (in Ostend or Amsterdam). His gravestone, in a Protestant cemetry in Gruebwiller, France, shows that he died on 29th September 1853. Before moving to France, at the invitation of Nicolas Schlumberger, he was a cotton spinner in Warrington and a Director of Sharp, Roberts.
Note: If correct, the reference to Sharp, Roberts and Co would be interesting because of the parallel and competing development of self-acting looms by De Jongh and Richard Roberts. However, this must be regarded as unconfirmed, in the absence of supporting information.
1800 Bankrupts: Jacob Lewis and Silvester Cohn, Liverpool, and Maurice de Jongh, Manchester, merchants, at the Bridgwater Arms, Manchester
1801 Married Maria Bennett in Chapel en le Frith.
1802 Maurice de Jongh of Manchester was naturalized British.
1804 Dividends, Dec. 6: Jacob Lewis and Silvester Cohn, Liverpool, and Maurice de Jongh, Manchester, merchants, at eleven, at the Bridgwater Arms, Manchester
He seems to have been working as a Merchant in London c.1810 - c.1815.
1812 Maurice De Jongh was admitted to The Worshipful Company of Pattenmakers in London.
1824 of Warrington. Cotton spinner. Patent. 
1827 Partnership dissolved: 'Maurice De Jongh, Henry Birch, and Lea Birch, Manchester and Warrington, Lancashire, and of Dinting, Derbyshire, merchants and cotton spinners'
1831 Partnership dissolved by mutual consent between Maurice De Jongh and John Jellicorse, cotton spinners, Stansfield Mill, Sowerby, Yorkshire, under the firm of De Jongh and Jellicorse.
1833 or 1835: 'En 1835 un manufacturier anglais, Maurice De Jongh, installa à Lautenbach le premier retordage du Haut-Rhin, .....' (In 1835 an English manufacturer, Maurice De Jongh, Lautenbach' started the first spinning mill(?) in the Upper Rhine. . It seems that most of the family moved to France. The mill made sewing thread.
Sources of Information
-  RootsChat forum: Topic: Maurice De Jongh, 1774-?
- Derby Mercury - Thursday 17 July 1800
- Morning Post - Monday 12 November 1804
- Mechanics Magazine 1824/05/01
- History, Directory, and Gazetteer, of the County Palatine of Lancaster, Volume 2, by Edward Baines & William Parson, 1825
- Aris's Birmingham Gazette - Monday 24 September 1827
- London Gazette, p.1055
-  LAUTENBACH - SCHWEIGHOUSE website