Abstract: A tire pressure sensing and alarm system having a sensor for each wheel of a vehicle, emitting an rf alarm signal upon sensing low pressure, and a receiver in the driver's compartment to give a visual and/or audible alarm upon receipt of the signal. The sensor has a pressure responsive piston and an adjustably positioned switch to be actuated by the piston.

Abstract: A method and necessary apparatus for detecting the unauthorized operation or asportation of mobile or portable equipment. The apparatus comprises a concealable transmitter designed to re-transmit a coded message received from a check station. The check station may be stationary such as at the exit gate of a garage or at a fixed checkpoint along a thoroughfare; or may be carried on a vehicle such as a police car or other type of security patrol. The concealed repeating transmitter is switched on or off by means of a pocket-sized short-range coded remote switch unit not unlike those used for the remote control of household television receivers.

Abstract: A portable vehicle alarm system having a motion sensitive switch and a transmitter for transmitting an alarm to a remote receiver. The receiver is capable of several functions including silent alarm to police or security guards as well as visual and audible alarms in remote locations such as light poles and roof tops of buildings. The alarm also includes a key set function with indicator lights for the motion switch and trip/transmit status.

Abstract: New and unique circuitry suitable for being located in electrical appliances, and which protects such appliances from theft and unauthorized movement. More particularly, the invention discloses circuitry for providing an alarm when the appliance is both disconnected and moved. The circuitry monitors both power input and movement of the appliance, and provides a pulsating signal suitable for sounding and audible alarm until the appliance is either reconnected or the alarm interrupted by a key switch. According to one particular embodiment, a mercury interrupter is uniquely arranged to operate as both the motion sensor and the oscillator for providing pulsating power to the audible alarm.

Abstract: An attitude change alarm for securing articles from theft or other undesired movement. The alarm includes a case having a wall which defines a hollow interior. Resistive elements are maintained within the wall in spaced relationship with each other and in common communication with an electrically conductive surface on the outside of the wall. An electrically conductive member is fixedly maintained in the hollow interior in constant contacting engagement with a conductive fluid which makes selective engagement with certain of the resistive elements. When the alarm is moved, a current is transmitted from the conductive coating through the resistive elements, fluid, and member, and is passed to a transformer which gates an SCR into conduction, activating the alarm. Various geometrical configurations of the attitude change alarm are presented, each having specific attributes associated therewith.

Abstract: A shirt-pocket medical alert device having a housing with a receptacle including an alarm connected to a tilt actuated circuit including a power source wherein a flowable substance in the circuit activates the alarm when the circuit is moved out of a normal orientation position.

Abstract: A conductor for transmitting an electrical signal from a signal generator on a rotating member to a signal detector on a relatively stationary member across the motion interface between the two members comprises at least one solid carbon graphite ring mounted coaxially between the two members and having a first annular surface in intimate contact with a mating conductive surface on the signal generator and having a second annular surface in intimate contact with a mating conductive surface on the stationary member that is electrically connected to the signal detector, said carbon graphite ring functioning as an electrical interconnection between the two members.

Abstract: A warning device having a sensing signal transmitting unit which includes a sensing element which operates when, for example, a door under observation is opened, and a receiving unit which produces a warning in response to the transmitted signal.

Abstract: A diagnostic and warning system for a motor vehicle monitors the condition of a number of preselected parameters. When the condition of a parameter is representative of a fault condition, the system energizes a malfunction lamp in the vehicle compartment during the period of the detected fault and the particular fault detected is stored in a nonvolatile memory. A single counter is employed which functions to filter intermittent malfunctions for each of the monitored parameters and which imposes a minimum time duration for energization of the malfunction lamp.

Abstract: An apparatus and method for testing impairment of motor skills is described comprising an electrically conducting stylus to be passed by the person being tested down a series of slots in a planar solid, the slots being in a variety of geometric shapes and having an electrically conducting edge, the stylus and the slot edges being connected to timing and counting means.

Abstract: A piezoelectric transducer frequency self-calibration system interrogates the transducer by driving it with various frequencies within a specified range while monitoring the transducer output power level. Two threshold frequency points are identified at which the output power level is at a predetermined threshold level less than the expected maximum output level, and the average of these two threshold frequencies is taken to be the optimum frequency.

Abstract: A signal communicator for transmitting an electrical signal from one member rotating relative to another member is in the configuration of a journal bearing and comprises at least one conically shaped annular graphite ring supported by inner and outer electrically conductive races. While one race is insulatively mounted on the rotating member and electrically connected to a condition sensor, the other race is insulatively mounted on the relatively stationary member and electrically connected to a signal detector, and the graphite ring is an electrical conductor interconnecting the sensor and detector via the two races. Alternatively, two opposing and contacting graphite rings are mounted in nonconducting carriers, one of the carriers keyed for rotation with the sensor while the other is mounted on the relatively stationary member.

Abstract: An infrared personnel locator system using a periodic unique infrared identification code emitted from a battery-powered transmitter unit to identify the person carrying the transmitter unit to an overhead infrared receiver as the person enters the receiver's monitoring zone. The transmitter unit identification code together with the receiver identification code is communicated to a common control unit which displays the location of all of the transmitter units. For paging, the system provides alerting units which are selectively operated in the zone closest to the person being paged. Additionally, the system controls electronic locks for restricting access of users to certain locations or equipment. A telephone interface provides system access from the telephone network.

Abstract: An article theft detection system for identifying which of two adjacent passageways a protected article passes. Each passageway is provided with spaced apart interrogation and receiver antennas, but a single receiver antenna services both passageways. Multiplexing is used to energize the interrogation antennas in alternate sequence. The single receiver antenna is connected to a single receiver whose output is connected through switches, synchronized with the interrogation multiplexing, to separate alarms for each passageway.

Abstract: A vehicle protective cover and alarm system therefor wherein the cover is of a design and configuration to at least enshroud the major body portion of the vehicle, and wherein at least two sensors are placed in opposed relationship to each of the inside surfaces of the cover and being coupled to an electrical system which upon movement of the cover will energize the system to produce an alarm signal.

Abstract: A merchandise security system in which a signal having a first frequency is generated and is multiplied or divided by n to provide a signal having a second frequency which is transmitted. A responder circuit in a tag on the merchandise divides or multiplies the transmitted signal by n and transmits it to a receiver where it is compared with the originally generated first frequency and is used to produce an alarm signal.

Abstract: A system for displaying the location of an open switch in a series alarm protection circuit containing a plurality of switches. A plurality of independent input monitoring circuits includes a display array to visually indicate the input status of each circuit, the monitoring circuits and visual displays being mounted on a common plate. The high input resistance of the monitoring circuits allows direct connection in a pre-determined sequence to the alarm protection circuit. An unconnected normally closed alarm protection loop has a higher and lower positive voltage value with respect to common voltage of the alarm unit at its input terminals. Designating the higher value as "start" and the lower value as "finish", the monitoring circuits are connected through a sequential order to the finish side of each serially connected switch. As a switch is opened all monitoring circuits that are electrically connected through a closed switch to the start terminals will display a lighted condition.

Abstract: A portable alarm particularly useful for protecting works of art in art galleries and museums is a self-contained alarm system in a display base member. The alarm is energized in response to the operation of either of two switches, in turn activated by spring biased plungers normally biased to extend out of the bottom and top surfaces, respectively, of the base member. When the base member is placed on a support such as a table, one of the switches is deactivated. When a work of art is placed on the top of the base member, the other switch plunger is depressed and its associated switch is deactivated. The alarm then is enabled for operation by a key operated switch connected in series circuit with the alarm and a silicon controlled rectifier (SCR).

Abstract: Self contained head mountable sleep inhibiting device comprising a container having two interfitting parts for housing the electrical and mechanical components of the device and employing an L-shaped clamp member pivotally mounted at the intersection of the legs of the clamp on a corner of the housing. The clamp firmly grips the stem of glasses or the rim or band of a hat for ease in mounting the device on a user.

Abstract: A radio operated remote control unit for attachment to a transmitter and having a second module attached to a transreceiver, which, through the use of a dual tone multi frequency signal, turns on the lights, or similar work, and maintains that status for a predetermined period of time. Also the electrical circuit employed to accomplish the said work.