History of hearing aids
The development of transistors in 1948 by Bell Laboratories led to major improvements to the hearing aid. The transistor was invented by John Bardeen, Walter Brattain, and William Shockley. Transistors were created to replace vacuum tubes; they were small, required less battery power and had less distortion and heat than their predecessor. These vacuum tubes were typically hot and fragile, so the transistor was the ideal replacement.The 1952 Sonotone 1010 used a transistor stage along with vacuum tubes, to extend battery life. The size of these transistors led to developments in miniature, carbon microphones. These microphones could be mounted on various items, even eyeglasses. In 1951, Raytheon manufactured the transistor and was one of the first companies to mass-produce transistors to throughout America. Raytheon realized that their hearing aid only lasted short-term and began to sell the vacuum-tube hearing aids again along with transistor hearing aids.
Nobel Prize controversies
The 1956 prize went to John Bardeen, Walter Houser Brattain and William Bradford Shockley "for their researches on semiconductors and their discovery of the transistor effect". However, the committee did not recognize numerous preceding patent applications. As early as 1928, Julius Edgar Lilienfeld patented several modern transistor types. In 1934, Oskar Heil patented a field-effect transistor. It is unclear whether Lilienfeld or Heil had built such devices, but they did cause later workers significant patent problems. Further, Herbert Mataré and Heinrich Welker, at Westinghouse Paris, applied for a patent in 1948 of an amplifier based on the minority carrier injection process. Mataré had first observed transconductance effects during the manufacture of germanium diodes for German radar equipment during World War II. Shockley was part of other controversies—including his position as a corporate director and his self-promotion efforts. Further, the original design Shockley presented to Brattain and Bardeen did not work. His share of the prize resulted from his development of the superior junction transistor, which became the basis of the electronics revolution. He excluded Brattain and Bardeen from the proceeds of this process, even though the idea may have been theirs. Another controversy associated with Shockley was his support of eugenics. He regarded his published works on this topic as the most important work of his career.