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U.S. patents available from 1976 to present.
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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."

Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830

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Number of patents: 1
Last date: September 19, 2006

Number	Title	Issue Date
7110511	Twisted pair communication system A communication system for passing information between information services and terminal devices over a twisted wire pair network. The information services include a telephone exchange and other services, such as a data network and a television distribution system. ...	09/19/2006