In early January 1876, Lindner, Dr. Falkenstein and Dr Eduard Pechuël-Loesche, came to the aid of the French mission of the Fathers of the Holy Spirit in Landana.

[3] On 19 August 1880, he joined the Comité d'Études du Haut-Congo (Upper Congo Study Committee), an instrument of King Leopold II of Belgium, and remained in the king´s service until 1 December 1885.

[3] On 30 March 1881, Maximilien Strauch wrote to Lindner,[4] The success of our enterprise depends entirely on the promptness with which we will occupy before all other competitors the most favourable sites for trade and conclude with the native chiefs treaties of friendship which will secure us large territorial concessions and special commercial advantages...

[6] Leopold named Lindner at different times for recruiting missions he planned in China, Lagos, Liberia and Tana, and for founding a trading and shipping company.

In 1900, he undertook a mission in China and Japan for the Compagnie Belge Commerciale, Industrielle et Minière pour l’Extrême-Orient (Belgian Far East Commercial, Industrial and Mining Company).

On 17 August 1907, Lindner set out from Brussels on a trip to China for the Compagnie Générale des Conduites d’Eau (General Water Pipe Company) of Liège to examine the possibility of sales outlets.

As a reward for his patriotism, and for improving the Viven-Bessières grenade and developing an aviation bomb, Lindner was granted full citizenship on 2 August 1926.