Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 6060991 | Detecting method and apparatus using a programmable memory device for storing a digitized reference value A detecting apparatus includes a processing device connected to a sensor, a programmable memory device and an alarm device. The sensor generates a signal output that varies according to a detected condition. The processing device includes a converting uni... | 05/09/2000 |
| 6057774 | Smoke alarm with anti-dust screen Smoke alarms that incorporate dust repelling screens exhibit improved performance with fewer false alarms. Effective screens include conductive strands combined with non-conductive elements.... | 05/02/2000 |
| 6052058 | Filter integrity monitoring system A method and system for monitoring integrity of a filter (25) of a smoke or fire detector system. The system has a detector chamber (14) into which light is passed from a light source incorporated into a light source control circuit (10). Scattered light ... | 04/18/2000 |
| 6049287 | Door with integrated smoke detector and hold open A door has a first outer face having an opening therein and a second outer face spaced a predetermined distance apart from the first outer face. A hold open device is located substantially between the first and second outer faces. The hold open device hol... | 04/11/2000 |
| 6046441 | Combustion activated device for disabling an electrical appliance The present invention relates to a device for automatically disabling power to an electrical appliance as a fire erupts. The device includes a plurality of combustion product gas sensors disposed within or proximal to an electrical appliance each in commu... | 04/04/2000 |
| 6043750 | Talking smoke detector An angle measurement tool having several components that are assembled to form two moving parts wherein one of the parts is a straight edged member combined with angle measurement means and the other is a straight edged member with both straight edge memb... | 03/28/2000 |
| 6027693 | Sealed replaceable sensor A gas detector having a sealed sensor assembly is only exposed to the ambient atmosphere when the detector is to be placed in the service. The detector is placed in the service by removing an elongated planar adhesive backed sealing member. The gas sensor... | 02/22/2000 |
| 5999089 | Alarm system An alarm system that includes a number of alarm detecting devices wherein each alarm detecting device includes an alarm condition detecting circuit, a secondary alarm activation circuit, and an audible alarm output circuit including an audio oscillator an... | 12/07/1999 |
| 5999094 | Combination telephone and smoke alarm system An in-building telephone distribution system has a multi-conductor telephone distribution cable, starting at the point where the telephone utility lines enter the building and extending from there to each location at which a telephone outlet is wanted, at... | 12/07/1999 |
| 5990797 | Ultraloud smoke detector An ultraloud ambient condition detector incorporates a sensor in combination with a control circuit. An alarm indicating signal from the control circuit energizes a multi-frequency drive circuit which produces a band of output frequencies usable to drive ... | 11/23/1999 |
| 5990789 | System and method for preventing smoke and fire damage to people and equipment in a clean room area from a fire A method and system for preventing smoke and fire damage in a clean room within which a tool including an electrically powered element is located. The method includes the step of providing the tool with a system including a fire proof housing, a sensor, a... | 11/23/1999 |
| 5986556 | Fire detector A fire detector capable of readily and accurately adjusting the sensitivity there of and of not erroneously outputting any fire signal is provided with a first-stage amplifying circuit having an output adjusting variable resistor and a fire discriminating... | 11/16/1999 |
| 5973603 | House/garage smoke detector A house and garage alarm system is provided including at least one detector housing with a smoke and/or carbon monoxide detector situated therein. A power source is situated within the detector housing. An alarm housing is included which is connected to t... | 10/26/1999 |
| 5969604 | System and method of adjusting smoothing An ambient condition detector includes a sensor for a first ambient condition and a second, sensor which is responsive to a second ambient condition not necessarily correlated to the first condition. Control circuitry, coupled to both sensors, processes a... | 10/19/1999 |
| 5969437 | Dual powered, smoke detector activated flashlight A dual powered flashlight responsive to an audible smoke detector alarm includes a sound sensor for sensing an audible smoke detector alarm and producing an electrical alarm signal in response; a frequency-sensitive amplifier amplifying the electrical ala... | 10/19/1999 |
| 5966079 | Visual indicator for identifying which of a plurality of dangerous condition warning devices has issued an audible low battery warning signal In order to facilitate determination of which of a plurality of dangerous condition warning devices is issuing an audio failing battery signal, the device incorporates a circuit including: a processor, an audio annunciator such as a horn, at least one vis... | 10/12/1999 |
| 5966078 | Battery saving circuit for a dangerous condition warning device In a processor controlled, battery operated dangerous condition warning device employing a DC-to-DC converter, the converter selectively operates at two voltage outputs. A first output voltage is used when a sensor is polled and when audio visual devices,... | 10/12/1999 |
| 5939994 | Automatic surveillance device A surveillance device, e.g. a fire alarm or an intrusion detector, includes a mount having a connector block, and an insert having a sensor assembly, a printed circuit board with evaluation electronics, and an electrical contact to the connector block. Th... | 08/17/1999 |
| 5936533 | Method of automatic verification of smoke detector operation within calibration limits A self-contained smoke detector system has internal self-diagnostic capabilities and accepts a replacement smoke intake canopy (14) without a need for recalibration. The system includes a microprocessor-based self-diagnostic circuit (200) that periodicall... | 08/10/1999 |
| 5936532 | Smoke and carbon monoxide detector with clock A smoke and carbon monoxide detector for mounting upon a wall, having a housing having a front face. A clock having clock hands and clock indicia is present on the front face. The detector comprises a smoke detector element, a carbon monoxide detector ele... | 08/10/1999 |
| 5936531 | Electrical fire sensing and prevention/extinguishing system An electrical fire sensing and fire prevention/extinguishing system which senses properties of electrical fires in cabinets having electrical circuits or circuit boards and detects sparks for detecting an electrical short in the electrical circuits or cir... | 08/10/1999 |
| 5926098 | Aspirated detector An aspirated-type detector includes a housing with an internal ambient condition sensing region and a sensor carried therein. The housing is perforated with ambient atmosphere inflow ports. A fan or similar device lowers the pressure in the internal regio... | 07/20/1999 |
| 5923260 | Smoke detecting apparatus utilizing light signal pulse widths The pulse width of a light reception pulse signal a from a light receiving device is detected, and the smoke density is detected based on a total pulse width of pulse widths per unit time period. Alternatively, the smoke density may be detected based on a... | 07/13/1999 |
| 5917420 | Smoke/fire detector for the hearing impaired An alarm apparatus for shaking a piece of furniture in response to detection of a physical occurrence, such as smoke, fire, CO2, or even a burglar, is provided. The apparatus includes a detector for detecting the physical occurrence and emittin... | 06/29/1999 |
| 5917417 | Smoke detection system A method of detecting the content of impurity in a gaseous medium has the steps of continually detecting impurities in the gaseous medium, emitting analyzing signals that vary with variation in impurity content, and statistically analyzing the emitted sig... | 06/29/1999 |
| 5914453 | Air handler filter monitoring apparatus A monitoring apparatus for alerting an operator to the need to change a temperature control system filter includes a mechanism for selecting and setting a primary period of filter use to assure replacement before the filter becomes clogged; a mechanism fo... | 06/22/1999 |
| 5912624 | Infant's sleep time monitor A framework is adapted to connect to a top of an infant's crib. A plurality of carbon dioxide detectors are attached to the framework. The carbon dioxide detectors are decorated for viewing pleasure of the infant. An alarm and a processor are provided. Th... | 06/15/1999 |
| 5898377 | Smoke detecting apparatus and method The smoke detecting apparatus of the present invention comprises a detection space (52) into which generated smoke is to be introduced; light-emitting means (2) for emitting a predetermined coded light pulse train into the detection space (52); light-dete... | 04/27/1999 |
| 5898369 | Communicating hazardous condition detector A hazardous condition detector system for a dwelling structure made up of independent detectors each capable of sensing the presence of a hazardous condition at its location, generating a local alarm and communicating, via a transmitted rf signal, the pre... | 04/27/1999 |
| 5889468 | Extra security smoke alarm system An extra security alarm system for monitoring conditions within a predetermined monitoring area and alerting persons located throughout the monitoring area, persons in the vicinity and appropriate emergency personnel of an emergency situation. The extra s... | 03/30/1999 |
| 5886638 | Method and apparatus for testing a carbon monoxide sensor A CO concentration monitoring device operating under the control of a processor periodically checks the CO sensor to insure its ongoing integrity and to issue a distinctive audio signal to a user if sensor integrity has become suspect. The periodic integr... | 03/23/1999 |
| 5886637 | Door with built-in smoke and fire detector A new door with built-in smoke and fire detector for incorporating a smoke and fire detector into a door. The inventive device includes a door having a generally rectangular configuration. The door includes front and rear surfaces. The door includes a sho... | 03/23/1999 |
| 5883577 | Multi station smoke detectors A smoke detector that comprises three different power sources. First one is the 110/220 volt AC house current, through a step down transformer or that can be hard wired into the home or factory. Second one is a moveable 9 volts rechargeable backup battery... | 03/16/1999 |
| 5880676 | Christmas tree ornament-shaped fire alarm A Christmas tree ornament-shaped fire alarm is provided including a housing shaped as a Christmas ornament and having an interior space. The housing is adapted to be situated on a Christmas tree. Further provided is a fire alarm situated within the housin... | 03/09/1999 |
| 5877684 | Sensor equipped portable alarm device which can be used in conjunction with external alarm device A sensor equipped portable alarm device that also has an input port for connecting to an external sensor so that either the internal sensor or the external sensor can be selected using a sensor select switch. Furthermore, the alarm device has a timer for ... | 03/02/1999 |
| 5872517 | Fire detector A fire detector capable of readily and accurately adjusting the sensitivity thereof and of not erroneously outputting any fire signal is provided with a first-stage amplifying circuit having an output adjusting variable resistor and a fire discriminating ... | 02/16/1999 |
| 5867095 | Module tamper detection circuitry A detector tamper/trouble delay circuit incorporates a sensor which senses the presence or absence of a cover for the detector. When the cover is removed, the sensor triggers a delay element preset for predetermined time interval. If the cover is replaced... | 02/02/1999 |
| 5867105 | Wireless alarm system A wireless alarm system for generating alarm signals discernible to the hearing impaired. The system includes a detection unit having a smoke or carbon dioxide detector which generates a signal upon sensing the occurrence of smoke or carbon dioxide. A tra... | 02/02/1999 |
| 5856784 | Low profile ionization chamber A very low profile ionization chamber provides increased operating current by using alpha particle emitting isotopes having low emission energies as an ionization source. The chamber includes a cylindrically shaped housing having height generally equal to... | 01/05/1999 |
| 5838242 | Fire detection system using modulation ratiometrics The present invention utilizes the modulation ratio between the flicker of a sensor signal and the absolute signal average to detect fire conditions. The system of the present invention requires that the signal on a sensor channel be above a certain thres... | 11/17/1998 |
