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| Number | Title | Issue Date |
| 5191855 | Battery missing indicator A battery powered condition detecting unit includes first and second battery retaining prongs which in the absence of a battery come in contact with a blocking flange on a cover thereby making it impossible to latch the cover to the unit. In the presence ... | 03/09/1993 |
| 4672232 | Microprocessor operated timing controller The timing controller includes a triac, a receptacle, and an AC wall outlet coupled in series. A sensor is coupled across the receptacle to sense when a lamp plugged therein is turned on or off. A microprocessor is coupled to the sensor circuit and stores... | 06/09/1987 |
| 4658481 | Safety release pin for fire extinguishers A safety release pin for locking the operating mechanism of a fire extinguisher includes a shank having a longitudinal slot near one end defining parallel side walls, each formed with a vertical groove, which attach a nose portion to the end of the shank.... | 04/21/1987 |
| 4647832 | Three position switch for portable, rechargeable device A three position slidable switch for use in a portable, rechargeable electrical device includes ON, OFF, and CHARGE positions. In the ON position a rechargeable battery is coupled in circuit with the device for the operation thereof. In the OFF position t... | 03/03/1987 |
| 4626695 | Photoelectric combustion products detector with low power consumption and improved noise immunity A photoelectric combustion products detector for periodically sampling the ambient air includes a sampling circuit capacitively coupled to an AC source, so that the coupling capacitor produces at the sampling circuit a source current 90° out of phase wit... | 12/02/1986 |
| 4621225 | Passive transformerless battery charging circuit A flashlight battery charging circuit includes a diode bridge which full-wave rectifies an AC voltage supplied from a 120 VAC supply through a coupling capacitor. The output terminals of the bridge are coupled to the battery through a Zener diode circuit ... | 11/04/1986 |
| 4619328 | Fire extinguisher valve with pressure indicator A discharge valve assembly for a fire extinguisher container includes a housing defining a passageway providing communication between the container outlet and a nozzle. An elongated tubular valve stem is axially movable in the passageway between open and ... | 10/28/1986 |
| 4618777 | Outer electrode with improved smoke entry An outer electrode for a combustion products detector comprising a cylindrical body including a plurality of first slats alternating with a plurality of second slats, the first slats being segments of a first surface of revolution, the second slats being ... | 10/21/1986 |
| 4595914 | Self-testing combustion products detector A self test circuit for a combustion products detector automatically periodically tests whether the sensitivity of the sensor is in a predetermined range between minimum and maximum sensitivities. Transistor switches selectively connect different test imp... | 06/17/1986 |
| 4539556 | Combustion products detector with accelerated test A battery-powered photoelectric smoke detector periodically samples the air in a smoke chamber. A manually-operated test button is provided for simulating smoke to test the device. The sampling frequency is determined by a first resistance. A frequency ch... | 09/03/1985 |
| 4488044 | Ionization chamber for smoke detector and the like An ionization smoke detector is disclosed in which an electric field is established in an ionization chamber which includes an outer cup-shaped electrode defining the chamber and having side wall apertures for permitting airflow therethrough and a circula... | 12/11/1984 |
| 4478468 | Line-gated switching power supply A lamp dimming module includes a lamp receptacle in series with a triac across the AC line, and a power supply for a processing unit, the processing unit supplying firing signals for the triac to control the dimming. The module plugs into the AC line. The... | 10/23/1984 |
| 4467263 | Rechargeable battery-powered flashlight system A rechargeable battery-operated flashlight system includes a housing for the flashlight, batteries and associated circuitry. A two-pronged plug is rotatably mounted in the housing for movement between two positions, the prongs projecting outwardly through... | 08/21/1984 |
| 4460863 | Battery charging flashlight circuit A flashlight has a built-in passive battery charging circuit adapted to be plugged into an associated AC source, and a selector switch for selectively connecting the battery to the charging circuit or to the flashlight lamp. The charging circuit includes ... | 07/17/1984 |
| 4452867 | Storage battery containing voltage reducing means A storage battery comprises interleaved anode and cathode electrodes and an electrolyte between them. A pair of oppositely poled diodes is coupled in parallel between one of the electrodes and one of the terminals of the battery, the other electrode being... | 06/05/1984 |
| 4418333 | Appliance control system An appliance control system includes a central control unit and a plurality of slave units each including a user-programmable microprocessor and respectively plugged into outlet sockets of a power main in a building, appliances being respectively coupled ... | 11/29/1983 |
| 4414612 | Hand-held light with means for controlling beam width A flashlight has a battery housing and a head. A carriage is slidably mounted on opposing walls of the head. The carriage carries a socket for holding a flashlight bulb. A tab on the carriage is accessible to one's finger to enable movement of the carriag... | 11/08/1983 |
| 4410881 | Electric horn with means for controlling curvature of the striker carrier The horn comprises a magnetically permeable housing with an electromagnet mounted therein and a diaphragm attached thereto. The electromagnet core may have an inclined bearing surface at one end thereof. A striker is disposed between the electromagnet bea... | 10/18/1983 |
| 4354652 | Sensor mounting assembly A mounting assembly is provided for mounting a sensing component of an alarm system in a predetermined orientation adjacent to the inner edge of a door or window frame having an outer surface. The assembly includes two angle brackets adapted to fit over t... | 10/19/1982 |
| 4328486 | Electric horn with improved striker assembly A horn includes a magnetically permeable housing having a diaphragm attached thereto and an electromagnet also attached to the housing. A carrier member loosely and unattachedly rests on a shelf in the housing and is attached to a striker member of magnet... | 05/04/1982 |
| 4316184 | Combination combustion-products detector A photosensor circuit produces a first sensor signal having an amplitude related to the quantity of smoke sensed thereby. An ionization sensor circuit produces a second sensor signal having an amplitude also related to the quantity of smoke sensed thereby... | 02/16/1982 |
| 4287517 | Circuit for eliminating low battery voltage alarm signal at night A battery-operated smoke alarm includes an alerting signal means for indicating when the battery voltage is low by comparing a first signal which is a function of the battery output voltage with a relatively fixed reference signal and producing an alertin... | 09/01/1981 |
| 4258261 | Electrode assembly for combustion products detector This electrode assembly includes two relatively large-diameter, parallel conductive discs spaced apart by an annular insulator which has peripheral flanges respectively encompassing the perimeters of the discs. The assembly is adapted to be disposed in an... | 03/24/1981 |
| 4230383 | Integral contact The contact connects a circuit element (such as a piezoelectric transducer) to a circuit (such as an oscillator which drives the transducer). The contact comprises a body, an ear which is mechanically and electrically connected to the circuit, and a pair ... | 10/28/1980 |
| 4207558 | Interconnection circuit for a plurality of alarm units Each alarm unit has a sensing circuit which supplies a signal in the presence of a particular problem such as smoke, heat, or equipment failure. The signal energizes an electronic switching device, to couple power to a horn which then produces an alerting... | 06/10/1980 |
