Air Liquide S.A. is a French multinational company which supplies industrial gases and services to various industries including medical, chemical and electronic manufacturers. Founded in 1902, after Linde it is the second largest supplier of industrial gases by revenues and has operations in over 80 countries. It has headquarters at the 7th arrondissement of Paris. Air Liquide owned the patent for Aqua-Lung until it expired. Air Liquide's headquarters are in Paris. It also has major sites in Japan, Houston, Newark, Delaware, Frankfurt, Shanghai and Dubai. The company's research and development targets the creation of industrial gases, and also gases that are used in products such as healthcare items, electronic chips, foods, and chemicals. The major R&D groups within Air Liquide focus on analysis, bioresources, combustion, membranes, modeling, and the production of hydrogen gas. Wikipedia