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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 |
| 4325142 | Portable radio set with a carrying holder A switch and an actuator therefore are arranged, respectively, on the portable radio unit and the carrying holder therefore in a manner such that, when the radio unit is inserted in the carrying holder, the switch is actuated to disconnect the microphone-... | 04/13/1982 |
| 4296408 | Location transmitting system A location transmitting system for use by one or more guards in a security system. Encoders are located at predetermined reporting locations which have no power supplies. Each guard carries a walkie-talkie radio transmitter which he places in a receptacle... | 10/20/1981 |
| 4286262 | Electronic transmitter device A system for opening garage doors in which a radio receiver in the garage, upon receipt of a signal, operates to open the garage door and in which a casing containing a radio transmitter is adapted for insertion into the socket of a cigarette lighter in t... | 08/25/1981 |
| 4254404 | Paging and servicing system In conjunction with the play of the game of Keno, a combination ticket holder and transmitter-receiver is located at each player's table. Each player's transmitter is coded with a number (e.g., 60,000) of two-tone sequential codes which are transmitted to... | 03/03/1981 |
| 4247850 | Visor and garage door operator assembly A visor and garage door operator assembly including a sun visor incorporating the transmitter of a radio controlled garage door operating system in which the transmitter is disposed within the recess of a visor and is provided with coding switches which a... | 01/27/1981 |
| 4215431 | Wireless transmission system A wireless transmission system for substantially noise-free transmission including a portable, battery powered, self contained transmitter for transmitting signals representative of an audio input to a remote receiver. The transmitter includes noise reduc... | 07/29/1980 |
| 4214207 | Switching circuit for radiosonde A radiosonde comprising a transmitter, a modulating oscillator, a control circuit for the oscillator and sensing elements to be switched into and out of said control circuit, characterized in that a solid state switching circuit is utilized for switching ... | 07/22/1980 |
| 4210870 | Signal transmitting system A capacitive signal dependent upon a quantity being measured is produced by capacitive sensors of a radiosonde. An oscillator in the radiosonde has an output frequency, controlled by the capacitive signal, in the order of 1 to 10 MHz. The output frequency... | 07/01/1980 |
| 4189676 | Switching system utilizing flexible circuit with transmission line for matched impedance connections Switching system for use with a radio transmitter or the like to adapt the same for operation at two different power levels, including a flexible circuit connected to stages of the transmitter and to a switch to control the power level of the signal trans... | 02/19/1980 |
| 4179588 | Encoder unit for mobile radio transmitter A multi-frequency encoder unit is provided for a mobile radio transmitter which is constructed as a single unitary package comprising a keyboard, a first printed circuit board positioned adjacent to the rear face of the keyboard and which includes a switc... | 12/18/1979 |
| 4107611 | Police protection method and apparatus This is a method and apparatus for performing such method to provide protection to police officers during the interviewing of witnesses and the investigation of matters, such protection being concerned with protection against false charges of police bruta... | 08/15/1978 |
| 4101871 | Touch-tone encoder unit for mobile radio transmitter A touch-tone encoder unit is provided for a mobile radio transmitter which is constructed as a single unitary package comprising a keyboard, a first printed circuit board positioned adjacent to the rear face of the keyboard which includes a switching circ... | 07/18/1978 |
| 4074241 | Radiosonde circuitry for impedance measurement of an Al2 O3 absolute water vapor sensor An improved circuit permits measurement of the impedance of an Al2 Ob.3 water vapor sensor used with conventional radiosonde telemetry systems. The circuit includes an oscillator, an output pulse shaper and a voltage regulator. The oscillator ... | 02/14/1978 |
| 4021807 | Beacon tracking system A radio frequency transmitter is hidden within a packet of currency which may be mingled with other currency packets in the cash drawer of a bank, convenience store or other such commercial institution. The transmitter is automatically activated by unauth... | 05/03/1977 |
| 4004228 | Portable transmitter A portable transmitter intended to be used to broadcast a signal in response to an external actuation can be constructed so as to include a board such as a so-called printed circuit board carrying a metal coil serving as an antenna. This coil surrounds a ... | 01/18/1977 |
