Quotables
"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 |
| 4408185 | Process for transferring information and system for carrying out the process An arrangement for transferring both power and information on one or more common AC power lines in which a first type of information is transmitted by terminating the current from the power supply in periods which constitute a fraction of a halfwave cycle... | 10/04/1983 |
| 4403212 | Digital radio paging communication system A paging communication receiver receives carrier waves modulated by a sequence of signals comprising a calling signal, a display information signal and a discriminating signal. The modulated carrier wave is demodulated to retrieve the calling signal, disp... | 09/06/1983 |
| 4395705 | Trouble-shooting circuit with first-failure identification capability A trouble-shooting circuit arrangement for localizing and identifying the first failure in time in a sequence of failures which has a plurality of monitor circuits including trouble detector circuits for producing direct current outputs in response to the... | 07/26/1983 |
| 4389639 | Voice warning device using entertainment speaker A device for producing a voice warning over a speaker which is also used with an entertainment sound production system such as a radio or cassette recorder. The voice warning device incorporates a switching device in the circuit between the speaker and a ... | 06/21/1983 |
| 4388726 | System for the ultra-high frequency transmission of numerical data A system for communicating numerical data over an UHF radio channel including a transmitter and receiver. The transmitter includes an UHF oscillator whose frequency is modulated by binary information elements from a coding device. The coding device includ... | 06/14/1983 |
| 4387368 | Telemetry system for centrifugal water chilling systems A telemetry system for reporting the status of a number of physical parameters occurring during operation of industrial equipment, such as the monitoring of refrigeration/air conditioning safety controls and anticipatory refrigeration controls. Activation... | 06/07/1983 |
| 4385287 | Multiple alarm condition detection and signalling A security system has a locality station sensing security risks such as fires, electrical faults and break-ins, being powered by a single line from a central station. The loading on the power supply is determined by logic circuits to give direct remote in... | 05/24/1983 |
| 4385296 | Remote-controlled automatic control apparatus A remote-controlled automatic door control apparatus includes a door, a driving unit connected to the door for driving the door to open and closed positions, and a control arrangement for controlling the door operation through the driving unit and includi... | 05/24/1983 |
| 4384269 | Vehicle acceleration/deceleration warning system having turn signal features An electronic acceleration/deceleration warning system for a vehicle includes an electro mechanical transducer, for example an arrangement of pendulum, light source and photocells, for converting acceleration or deceleration of the vehicle into an electri... | 05/17/1983 |
| 4384271 | Traffic light A traffic light construction which provides a signal of a high luminous intensity, a gradual brightness variation over a cover glass and a considerable suppression of phantom phenomena. The traffic light has a parabolic reflector having a depth of about i... | 05/17/1983 |
| 4381502 | Method and apparatus for character generation Generation of a character code for an alphabetic character is performed by depressing at least two keys in a sequence. The code is generated when the last key is depressed and the other keys in the sequence still are pressed, or when all keys in the seque... | 04/26/1983 |
| 4381500 | Keyboard apparatus A keyboard apparatus has item keys for data entry, and select keys for changing the display of input data written on sheets, according to the item keys, and a changer for the sheets stored in a cartridge, which separates the sheets in the cartridge into t... | 04/26/1983 |
| 4380753 | Turn signal and hazard signal control circuit An electronic control circuit for controlling left and right turn signal lamps including a turn signal circuit to activate the left or right lamp and then automatically deactivate either lamp after a predetermined time period, a hazard signal circuit to f... | 04/19/1983 |
| 4378551 | Radio signal receiving apparatus with a security circuitry A radio signal receiving apparatus such as a pager with a security circuitry includes operator-controlled switches for providing a plurality of different command signals which are used to actuate the receiving apparatus in a different mode of operation, a... | 03/29/1983 |
| 4378554 | Fixed/movable supervised alarm loop An alarm sensing loop for selectively monitoring at least first and second alarm sensors includes terminals for connection to a source, a selection circuit connected to the terminals and having first and second states, a first alarm sensor connected to th... | 03/29/1983 |
| 4377802 | Lamp/reflector assembly A reflector for rotatable signal lights includes a pair of coaxial parabolic reflecting surfaces which are interrupted and joined back-to-back with the juncture forming an aperture which defines a plane through the common focal point of the two reflecting... | 03/22/1983 |
| 4376935 | Handbag utilizing automatically functioning illumination and alarm devices An electrical arrangement for a handbag including a switch unit having at least one electrical terminal on its exterior, a magnetically resposive switch in its interior connected to the terminal, and a battery in the handbag connected to the terminal and ... | 03/15/1983 |
| 4375634 | Warning light A warning light which has a dome-shaped lens containing a xenon stroboscopic bulb and a halogen cycle bulb. The bulbs are energized, either separately or at the same time, to provide two types of warning lights, while means are provided for minimizing the... | 03/01/1983 |
| 4375637 | Integrated alarm, security, building management, and communications system A fully integrated alarm, communication, and building management system has a central control station and a plurality of remotely located sensing and controlling devices. Each remote device has an individual digital address, which is a parallel address pr... | 03/01/1983 |
| 4374381 | Touch terminal with reliable pad selection A touch terminal identifies a single user-selectable, touch-responsive pad element on the display screen for user communication with a data processing system. The terminal makes the identification in response to the durations of pulse signals which vary a... | 02/15/1983 |
| 4370644 | Alarm device for a door, automatically switched off during a licit access An alarm device for doors having in series an electric supply, such as batteries, three switches and a relay. The relay is locked upon the simultaneous closing of the three switches and actuates an alarm circuit. The first and second switches are respecti... | 01/25/1983 |
| 4369436 | Anti-bridging cable supervision circuit In an intrusion alarm system, an anti-tamper system for detecting the bridging and removal of sensors connected in parallel along an interconnection cable includes means at each sensor for detecting open circuits on or shorting between any of the lines of... | 01/18/1983 |
| 4368455 | Heavy duty emergency power pack for vehicle trailer A portable, heavy duty emerency power pack for hooking up to the lighting system of a vehicle trailer, such as a semi-trailer, camper, mobile home or the like, for the purpose of flashing all or some of the trailer lights on and off while the trailer is u... | 01/11/1983 |
| 4367458 | Supervised wireless security system An ultrasonic communication system capable of wireless installation and supervised operation is achieved by communicating each information bit as two distinct ultrasonic frequencies separated in frequency enough to assure that the signal strength of both ... | 01/04/1983 |
| 4366482 | Transmitter with buzzer A garage door opener system includes a radio receiver actuable by reception of a preselected radio signal for moving a garage door between opened and closed positions and a portable hand-held transmitter manually actuable to transmit such preselected radi... | 12/28/1982 |
| 4365237 | Security audio visual emergency system A conventional lamp having a tubular yoke around the bulb that supports a lamp shade is converted into a security system by a simple physical electrical and mechanical coupling of two modules, eliminating wiring and installation tools. The first module, r... | 12/21/1982 |
| 4365241 | Device for indicating the charging state of a battery A device of indicating the charging state of a battery including a series combination of a diode and an indicating lamp connected between an output terminal of a rectifying means of an alternator and a battery. A first switching means activates the indica... | 12/21/1982 |
| 4365250 | Garage door operation control apparatus A garage door operation control apparatus includes a door operating system for opening and closing the main door of a garage, a main detection circuit for detecting the open or closed condition of the main door, an auxiliary detection circuit for detectin... | 12/21/1982 |
| 4364046 | Rotation angle detecting device A rotation angle detecting device with a pair of variable capacitors which are formed with a rotating object, i.e. a movable electrode, and two stationary electrodes disposed around the rotating object, so that the capacitors operate in a differential mod... | 12/14/1982 |
| 4363022 | Self cancelling motorcycle turn signal which recognizes balance An improved solid state self cancelling motorcycle turn signal system that recognizes when the turn has been completed. The circuit utilizes silicon controlled rectifiers for energizing the motorcycle turn signal lights. Mercury switches are adjusted and ... | 12/07/1982 |
| 4361837 | Remote control circuit employing frequency/direct signal converters A remote control circuit which operates on a frequency basis and essentially with analog signals. The remote control circuit includes at the transmitting end a controlled oscillator, a frequency/direct signal converter and a comparator connected together ... | 11/30/1982 |
| 4361833 | Multi-sensor alarm system and method of protecting a premises A multi-sensor alarm system and method of protecting a premises include at least one sensor circuit and an alarm circuit which together establish a two-wire closed loop electrical circuit path in which a wide variety of alarm sensors are accommodated. The... | 11/30/1982 |
| 4361828 | Automotive communication A vehicle communication system device consisting of an opto-electrical message display unit adapted to be viewed from the exterior of the vehicle and of a message control unit that is connected to the display unit for programming a message and transmittin... | 11/30/1982 |
| 4361829 | Device for the turn indicator blinker lights of a motor vehicle, especially of a motorcycle A device for indicating engagement or operable condition of turn indicator blinker lights of a vehicle, wherein the vehicle is provided with a gripping member adapted to be contacted by the driver of a vehicle, such as a grip of a handlebar of a motorcycl... | 11/30/1982 |
| 4361832 | Automatic centralized monitoring system An automatic centralized monitoring system capable of monitoring various sensors in a plurality of premises with rapidity; this is accomplished by combining the premises into a plurality of groups; the central station is provided with as many computer-con... | 11/30/1982 |
| 4361839 | Charge source multiplexing A charge-mode signal conditioning interface includes a charge-mode signal multiplexer for providing a low impedance series path for the output charge signals from each charge source to the input of the common charge amplifier, one at a time in each sample... | 11/30/1982 |
| 4360801 | Home security and garage door operator system A home security and garage door operator system includes a gas sensor for detecting the level of toxic gas in the garage. When the gas level exceeds a predetermined threshold the garage door is automatically opened. Lock out circuitry is provided for prev... | 11/23/1982 |
| 4360808 | Radio control apparatus with voice transmission capability A radio controller for radio control of model vehicles and the like. The controller can be placed in a control mode wherein vehicle functions such as motor speed, direction, horn and lights are controlled by control signals. In addition, the controller ca... | 11/23/1982 |
| 4359717 | Position-sensitive alarm system To increase the responsiveness of a vehicle alarm system to, for example, unauthorized entry through windows, jacking up for removal of parts or vehicle theft as well violent impact by another vehicle, at least one position sensitive sensor has its output... | 11/16/1982 |
| 4358751 | Automatically cancelling turn signal apparatus An automatically cancelling turn signal apparatus for a powered vehicle including left turn and right turn indicators. A switch selectively activates the indicators. A mechanism inactivates the indicators responsive to a predetermined increase in vehicle ... | 11/09/1982 |
