Superman (1939). Certain materials such as lead can block his X-ray vision. Superman can project beams of heat from his eyes which are hot enough to melt steel. He first used this power in "Superman" #59 (1949) by applying his X-ray vision at its highest intensity. In later stories, this ability is simply called "heat vision". Superman can hear sounds that are too faint for a human to hear, and at frequencies outside the human hearing range. This ability is introduced in "Action Comics" #11 (1939). "Action Comics" #1 (1938) explained that Superman's strength was common to all Kryptonians because they
Superman for copyright infringement. The trial began in March 1948 after seven years of discovery. The judge ruled that Fawcett had indeed infringed on Superman. However, the judge also found that the copyright notices that appeared with the Superman newspaper strips did not meet the technical standards of the Copyright Act of 1909 and were therefore invalid. Furthermore, since the newspaper strips carried stories adapted from "Action Comics", the judge ruled that DC Comics had effectively abandoned the copyright to the "Action Comics" stories. The judge ruled that DC Comics had effectively abandoned the copyright to Superman and therefore waived its