Patents Assigned to A. R. F. Products
  • Patent number: 4507654
    Abstract: A security device for determining the opening or closed condition of an access gate, such as a door or window hinged within an opening in a wall, has a detector unit mounted on the wall adjacent to the opening and linked to a remote control unit by a radio transmitter in the detection unit and a radio receiver in the control unit. The detection unit has an infrared generator and an infrared detector isolated from the generator, the detector and generator confronting a reflector mounted on the access gate when the access gate is closed. The reflector is translated from the field of the infrared generator when the access gate is open. The infrared generator is excited by a pulse generator to produce pulses of infrared radiation, and the scattered radiation from the reflector is detected by the infrared detector to produce electrical pulses coincident with the pulse generator.
    Type: Grant
    Filed: October 30, 1981
    Date of Patent: March 26, 1985
    Assignee: A. R. F. Products
    Inventors: Larry G. Stolarczyk, John R. Owerko
  • Patent number: 4462022
    Abstract: A wireless security system in which a sensor for detecting a security violation is provided with a radio frequency transmitter adapted to excite the receiver of a control unit at a different location, the transmitter of the sensor radiating a signal responsive to the occurrence of a security violation. The sensor also having means to periodically excite the transmitter after the lapse of a period of time to indicate that the sensor is in proper working order, that period varying randomly. The control unit is provided with a memory and stores responses to the random signals, and at intervals long with respect to the random periods, samples the memory. The control unit responds to the absense of a stored response from the transmissions of the sensor.In a preferred construction, a plurality of sensors are employed with a single control unit, each of the sensors radiating a unique encoded signal.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: July 24, 1984
    Assignee: A. R. F. Products, Inc.
    Inventor: Larry G. Stolarczyk
  • Patent number: 4105523
    Abstract: A biochemical oxygen demand measuring device which utilizes the decrease in pressure in an air space above the sample under measurement in a sealed reaction vessel to actuate an oxygen generator which utilizes an electrolysis cell communicating with the reaction vessel. The quantity of oxygen supplied by the oxygen generator is a measurement of the biochemical oxygen demand and is proportional to the quantity of electricity used in the electrolysis cell. Electrical pulses in a chain of constant amplitude and constant duration are applied to the electrolysis cell and the chain of pulses is interrupted by means responsive to the pressure in the reaction vessel to maintain the pressure in the reaction vessel constant. A counter is employed to count the pulses over a period of time as a measurement of the oxygen taken up by the reaction in the pressure vessel. A barometric correction device is employed with a sensing electrode in the electrolysis cell to control the pulses of electrical energy.
    Type: Grant
    Filed: March 31, 1976
    Date of Patent: August 8, 1978
    Assignee: A. R. F. Products, Inc.
    Inventor: Larry G. Stolarczyk
  • Patent number: 4092643
    Abstract: A security system in which fire or intrusion signals may be impressed on a first and a second monostable oscillator connected in timing circuits, the first monostable oscillator producing an output for a first limited time period to excite an alarm, and coincidently in time a second monostable oscillator producing an output of shorter second time period for delaying actuation of the alarm to permit the operator to deactivate the unit prior to actuation of the alarm, each of the monostable oscillators using an integrated circuit and being reset by application of power to the unit and during function key switch position change. The fire channel has top priority over any other functional characteristics of the master control.
    Type: Grant
    Filed: April 25, 1975
    Date of Patent: May 30, 1978
    Assignee: A. R. F. Products, Inc.
    Inventor: Larry G. Stolarczyk