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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 | Title | Issue Date |
| 5864296 | Fingerprint detector using ridge resistance sensor A technique for detecting and verifying a fingerprint includes a skin resistance sensing array for translating the skin resistance of a fingertip into an electrical signal. The fingertip is moved relative to the skin resistance sensing array in a first li... | 01/26/1999 |
| 5347275 | Optical pointer input device A computer input device uses an ordinary sheet material such as a card, letter or envelope to select and point to a symbol. A remote portion of the sheet material covers adjacent light emitters and sensors which sense reflected light from the emitters. A ... | 09/13/1994 |
| 4893120 | Touch panel using modulated light A touch panel system using modulated light beams to enable the system to detect when one or more of the light beams are blocked even in bright ambient light conditions. The system has a "touch sensitive" display surface with a defined perimeter. Surroundi... | 01/09/1990 |
| 4590330 | Printer A printer includes a carriage supporting a print head and movable across print paper for enabling the print head to print on the print paper, a fixed frame, a switch device mounted on one of the carriage and the fixed frame, the switch device being compos... | 05/20/1986 |
| 4373114 | Method and means of reading punched data tape A photoelectric circuit for reading punched data tape wherein the circuit compensates for variations in phototransistors and light emitting diodes, dust accumulation and degradation of the light emitting diodes by comparing the light transmitted through a... | 02/08/1983 |
| 4159183 | Keyboard employing photoelectric key actuation sensing In a key-operated machine in which actuation of a key moves code elements of an associated code card into the path of a photoelectric sensing system, each code card is moved by a drive mechanism so as to cause the code elements to traverse the sensing sys... | 06/26/1979 |
| 4152699 | Optical keyboard having a plurality of pivotal light obstructing code bars A plurality of optical transmission tracts direct radiant energy from an appropriate light source to each of a plurality of photo-transistors or other light sensitive elements. The photo-transistors are adapted to generate an output signal whenever the ra... | 05/01/1979 |
| 4064388 | Decoder clutching system for minicomputers A decoder clutching system for use in a minicomputer such as the Burroughs Series-L or TC-Series minicomputer is employed to reduce noise and extend the life of the decoder while minimizing power consumption. An electromagnetic master clutch is secured to... | 12/20/1977 |
