About ECSCRM 2006 Logo

 In late 1906, General Henry Harrison Chase Dunwoody (1842-1933) obtained the patent* for wireless telegraph system with carborundum crystal (called by the inventor as a "wave-responsive device") used to detect radio waves. Several years later, carborundum detectors were introduced to market for use in radio receivers. They needed a bias of a couple of volts and were less sensitive than made of galena, but they were more mechanically stable, and were sold adjusted and packaged in cartridges. This is why the carborundum detector can be considered as the first commercial semiconductor device.

One of carborundum wave-responsive device designs invented by Gen. H.H.C. Dunwoody is shown in the ECSCRM 2006 logo to commemorate the centenary of silicon carbide electronics.

 * H. H. C. Dunwoody, Wireless telegraph system, US Patent US837616, (1906).