| Derniers inventions, produits et services
				    			
				    			
				    				
				    					| 2020 | Invention | Underground thermal energy storage. 
Underground thermal energy storage in a cylindrical or n-gon... |  
				    					| 2018 | Invention | Wall part, heat buffer and energy exchange system. Heat buffer comprising at least mechanically c... |  
				    					| 2017 | Invention | Underground thermal energy storage. Underground thermal energy storage in a cylindrical or n-gona... |  
				    					| 2016 | Invention | Underground thermal energy storage. The invention provides an underground thermal energy storage ... |  |