Maurice GRENIER Born Februray 23rd, 1927 Secondary school in Condorcet, Paris Civil engineer of Mines, Paris Career in L’AIR LIQUIDE company. He took part, as technical manager, to the tremendous development of the large oxygen plant, field where L’AIR LIQUIDE remains worldwide leader. He registered around 50 patents in cooperation with other engineers. After he retired, he registered a patent on the liquefaction of natural gas for GAZ DE FRANCE. For several years, during his spare time, he developed solutions for propulsion of the boats with kite sails.