In the late 1920s, two Austrian born scientists,
Friedrich Paneth and
Kurt Peters, originally reported the transformation of hydrogen into helium by spontaneous nuclear catalysis when hydrogen was absorbed by finely divided palladium at room temperature. However, the authors later retracted that report, acknowledging that the helium they measured was due to background from the air.
[17][18]
In 1927, Swedish scientist J. Tandberg stated that he had fused hydrogen into helium in an
electrolytic cell with palladium electrodes.
[17] On the basis of his work, he applied for a Swedish patent for "a method to produce helium and useful reaction energy". After
deuterium was discovered in 1932, Tandberg continued his experiments with
heavy water. Due to Paneth and Peters' retraction, Tandberg's patent application was eventually denied.
[17] His application for a patent in 1927 was denied as he could not explain the physical process.
[19]