[1] From 1941, Lintner was a teaching assistant to Georg Stetter at the Universität Wien.
During World War II, Lintner worked on a team headed by Georg Stetter, a principal working on the German nuclear energy project, also known as the Uranverein (Uranium Club).
Stetter led a group of six physicists and physical chemists in measuring atomic constants and neutron cross sections, as well as investigating transuranic elements; in 1943, Stetter held the unified directorship of the Institut für Neutronenforschung (Institute for Neutron Research), the II.
Lintner did research on the inelastic dispersion of fast neutrons in uranium.
He was a full member of the Section for Mathematics and the Natural Sciences of the Österreichische Akademie der Wissenschaften[9][10] The following are cited as Geheimberichte (secret reports) on German nuclear research from the period 1939 to 1945 and which are being held in the Stadtarchiv Haigerloch:[12]