Abstract: An electronic security system for protecting an interior space such as the interior of an automobile includes a settable alarm for producing, when set by an arming signal, an alarm indication in response to a trigger signal, an arming circuit which, when activated, provides a setting signal to the alarm and activating means for activating and deactivating the arming circuit. The system also includes a detector for detecting a presence in the space being protected and providing a trigger signal to the alarm in response thereto and a detector, which may be the same as the detector which triggers the alarm, to inhibit activation of the arming circuit when a presence is detected in the space before the alarm is set. When the system is implemented as a vehicle anti-theft device, it may also include provision for preventing the system from becoming armed when the vehicle's engine is running and for preventing the vehicle's automatic door locks from locking when the vehicle is still occupied.

Abstract: A filter system includes a fluid-tight housing with filter elements supported in said housing and dividing the interior of the housing into first and second chambers. A pump pumps a liquid under pressure into said first chamber so that the liquid flows from the first chamber through the filter elements into said second chamber. An energy store is located in the housing which stores energy each time the pump is turned on and pressurizes the first chamber. When the pump is turned off and relieves the pressure in the first chamber, the potential energy stored in the energy store is applied as kinetic energy for moving the filter elements and increasing the pressure in the second chamber to cause liquid backflow through the filter elements which deans and rejuvenates the filter elements.

Abstract: A security system for a vehicle of the type having an engine with a starting switch movable between an OFF position and an engine START position includes an alarm module for disabling the engine and/or sounding an alarm in the event of an intrusion into the vehicle. Activating means activate the alarm module either automatically when the vehicle operator leaves the vehicle or in response to a signal from a transmitter in the operator's possession. The alarm module can be disarmed or deactivated without the transmitter by turning the engine starting switch from its OFF to its START position a selected number of times. A time delay may also be incorporated into the system so the disarm code may be a selected number of start attempts in combination with a selected time delay(s) before, during or after those attempts have been made.

Abstract: Vehicle security apparatus includes a tubular housing, a lock barrel having a rotary lock cylinder that controls a retractable latch, the barrel being slidably received in the housing bore and movable between an unlocked extended position and a locked retracted position within the bore. There is also a spring positioned in the housing bore which biases the barrel toward its extended position and detents for establishing the extended and retracted positions of the barrel by engagement with the barrel latch. The barrell is rotatable within the housing to a release position when the barrel is not in its locked position so that the latch no longer engages the detents, enabling the barrel to be pulled entirely out of the housing.

Abstract: Vehicle security apparatus includes a tubular housing, a lock barrel having a rotary lock cylinder that controls a retractable latch, the barrel being slidably received in the housing bore and movable between an unlocked extended position and a locked retracted position within the bore. There is also a spring positioned in the housing bore which biases the barrel toward its extended position and detents for establishing the extended and retracted positions of the barrel by engagement with the barrel latch. The barrel is rotatable within the housing to a release position when the barrel is not in its locked position so that the latch no longer engages the detents, enabling the barrel to be pulled entirely out of the housing. The lock barrel also operates a switch for enabling an alarm signal circuit which produces an alarm signal in response to an intrusion noise within a selected frequency band.

Abstract: A passive vehicle antitheft system utilizes a unique combination of condition responsive switching components to control the access to and use of a vehicle. Primary control over the vehicle is provided by a control relay including a first "protection" position in which the vehicle ignition system and starter are disabled and an alarm system is enabled and a second "use" position in which the ignition system and starter are enabled and the alarm system is disabled. The control relay is in turn controlled by three bistable switching components that are selectively enabled and disabled at various stages of use of the vehicle. The switching components, which in the preferred embodiment comprise a triac, a silicon controlled rectifier, and a second relay, automatically switch the control relay to its "protection" position as an authorized user leaves the vehicle and closes the last vehicle door.