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| Number | Title | Issue Date |
| 4483683 | Ski tow signal assembly A radio receiver in a boat actuates a horn and a rotary strobe light when it receives an appropriate signal from a transmitter recessed in the handle of a ski rope. The actuation of the transmitter is controlled by a trigger on the handle.... | 11/20/1984 |
| 4468656 | Emergency signalling unit and alarm system for rescuing endangered workers An emergency signalling unit which is designed to be carried on the person of a fireman or other worker to alert control personnel should the worker become endangered, and an alarm system which incorporates a plurality of such signalling units, each one w... | 08/28/1984 |
| 4430757 | Radioelectric signal trains generator and portable transmitter comprising such a generator The present invention relates to a radio signals transmitter. The transmitter according to the invention comprises a pulse train generator including a quartz oscillator, generating a high frequency signal which is provided to a transistor 7 controlled by the c... | 02/07/1984 |
| 4412106 | High fidelity stereophonic reproduction system An audio system for portable high fidelity reproduction, to provide a sensation of being surrounded by a three-dimensional field of lifelike sound events, comprises a set of miniaturized electro-acoustical devices adapted to each other and for battery-ope... | 10/25/1983 |
| 4403341 | Emergency information communicating device Emergency information communicating device is disclosed having a wireless transmission circuit, a switch means and a battery which are provided in a waterproof case body, a permanent magnet inserted in a slot defined in the case body for providing a magne... | 09/06/1983 |
| 4340972 | Transmitter/receiver teaching apparatus A teaching apparatus including a transmitter portion, a receiver portion and a prompter portion, each of the portions being disposed in a separate self-contained unit, the transmitter portion being adapted to be worn on the head and including a peripheral... | 07/20/1982 |
| 4334315 | Wireless transmitting and receiving systems including ear microphones A wireless transmitting and receiving system includes an ear microphone of the vibration pick-up type for picking up bone-conducted voice signals through an external auditory ear canal wall of a wearer. A portable case is disposed adjacent the wearer's ea... | 06/08/1982 |
| 4327444 | Miniature transmitter and method for making same There is disclosed a miniature hand-held radio-frequency transmitter. An operating frequency is determined by a lumped-circuit oscillator which feeds an antenna etched on the periphery of the circuit board. The antenna is tuned to a frequency which is sli... | 04/27/1982 |
| 4323999 | Automatic transmission or recording or transmission and reception control system A system to automatically control the changeover of recording and recording stop, or transmission and transmission stop, and being employed in the recording or transmitting device provided with a vibration pick-up type microphone for picking up bone-condu... | 04/06/1982 |
| 4300129 | Silent wearable signalling device with tactile means to prevent false triggering A concealable signaling, e.g., radio alarm, device worn on the person and actuated by concealed switch means that include mechanical detents. The engagement of the detents provides secret tactile information back to the wearer. The presently preferred emb... | 11/10/1981 |
| 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 |
| 4262632 | Electronic livestock identification system An electronic identification system for livestock, particularly adapted to tagging ruminating animals, such as cattle and sheep, comprising a transmitter capsule which is implantable in the animal and precoded to broadcast a series of binary coded electri... | 04/21/1981 |
| 4227189 | Alarm activating device An alarm activating device is provided for closing a normally open circuit upon release of body pressure upon the rearward wall of the device, comprising a first, second, and third plate supported respectively in substantially parallel alignment behind a ... | 10/07/1980 |
| 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 |
| 4211980 | Method of creating an electric field for shark repellent Method for repelling sharks and the like by creating an electric field containing a zone about an anode and/or cathode electrodes submersed in salt water. A voltage gradient of sufficient magnitude to overstimulate the nervous system of a shark has been f... | 07/08/1980 |
| 4162449 | Apparatus for communicating receipt of transmitted messages An apparatus is provided for communicating to a transmitter or sender of an emergency message a response indicating that the message was received. The apparatus operates in conjunction with a portable transceiver alarm unit carried by the sender, a contin... | 07/24/1979 |
| 4157540 | Wireless alarm system The wireless alarm system comprises a portable wireless transmitter assembly adapted to be concealed on the person, a radio receiver and signal decoder for receiving a coded wireless signal transmitted by the radio transmitter, an adjustable timer and sig... | 06/05/1979 |
| 4121160 | Switch means for radio alarm device In a miniature concealable radio alarm transmitter to be worn on the person, a switch means to activate the transmitter. The transmitter is preferably flat in shape, and includes a small battery which extends across the end of the circuit board. Two sprin... | 10/17/1978 |
| 4087791 | Electromagnetically responsive device and system for detecting the same A passive electromagnetically responsive device comprising a miniature tuned inductive-capacitive circuit. The device is preferably detected by stimulating oscillations at the resonant frequency of the circuit by a pulsed electromagnetic field. The device... | 05/02/1978 |
| 4083003 | Vehicle location system A vehicle location system having a plurality of stationary wayside stations positioned at predetermined geographical locations. The passage of a vehicle near a station references the location of the vehicle at that point in time and automatically supplies... | 04/04/1978 |
| 4073416 | Carrying belt for CB radios and similar devices A carrying belt for CB radios and similar devices comprising a strap adapted to fit and secure about the waist of the user, a mounting harness mounted on the strap comprising an essentially flat pad provided with a plurality of mounting straps disposed at... | 02/14/1978 |
| 4067015 | System and method for tracking a signal source A system for tracking moving signal sources is disclosed which is particularly adaptable for use in tracking stage performers, although a wide range of other uses is possible. A miniature transmitter is attached to the person or object to be tracked and e... | 01/03/1978 |
| 4057805 | Radio-controlled machine power cut-off A pair of battery-powered radio transmitters are individually worn on the wrists of a machine operator, and two radio receivers are tuned to receive the signals broadcast by the radio transmitters, the first radio receiver being a proximity-sensitive devi... | 11/08/1977 |
| 4057794 | Calling aids A pocket-size portable transmitter in an emergency call transmission system for geriatric persons has an actuator including a simple switch part such as a push button and a simple cover part movable between a normal closed position covering the switch to ... | 11/08/1977 |
| 4042882 | Radio-balloon distress signal A signal for indicating the location of one or more people in distress comprising a rectangular tank containing helium, an inflatable balloon enclosed by a casing of aluminum foil and tubular connections between the tank and the balloon and which include ... | 08/16/1977 |
| 4041394 | Radio control transmitter In order to facilitate operation of a radio remote control transmitter, the transmitter components are built into the structure of a vest-like garment, and the transmitter is operated by placing a magnet on the wrist of the user adjacent one of a number o... | 08/09/1977 |
| 3983483 | Communications device arranged to be worn in intimate contact with the body of a user A communications device arranged to be worn in intimate contact with the body of a user and without interference with bodily movements includes a radio transmitter and receiver for communicating with a remote station. The transmitter includes means arrang... | 09/28/1976 |
| 3972038 | Accelerometer telemetry system An accelerometer telemetry system incorporated in a finger ring is used for monitoring the motor responses of a subject. The system includes an accelerometer, battery and transmitter and provides information to a remote receiver regarding hand movements o... | 07/27/1976 |
| 3968435 | Communication system An electronic short range communication system which allows communication between two or more parties who are fairly close to each other and which allows communication between parties having the communication equipment without interfering with those who d... | 07/06/1976 |
| 3958560 | Non-invasive automatic glucose sensor system A unique glucose sensor to determine the glucose level in patients, for example, for use in treating or diagnosing diabetes. The patient's eye is automatically scanned using a source of radiation at one side of the patient's cornea. A sensor located at th... | 05/25/1976 |
