Before revision: Jagadis Chunder Bose, Detector for Electrical Disturbances, filed: 30 September 1901, granted 29 March 1904 The crystal detector was developed into a practical radio component mainly by G. W. Pickard, Greenleaf Whittier Pickard, Means for Receiving Intelligence Communicated by Electric Waves, filed: 30 August 1906, granted: 20 November 1906 archived: part1, part2, part3, part4 who began research on detector materials in 1902 and found hundreds of substances that could be used in forming rectifying junctions.
After revision: Jagadis Chunder Bose, Detector for Electrical Disturbances, filed: 30 September 1901, granted 29 March 1904 The crystal detector was developed into a practical radio component mainly by G. W. Pickard, Greenleaf Whittier Pickard, Means for Receiving Intelligence Communicated by Electric Waves, filed: 30 August 1906, granted: 20 November 1906 archived: part1, part2, part3, part4 who discovered crystal rectification in 1902 and found hundreds of substances that could be used in forming rectifying junctions.