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| Number | Title | Issue Date |
| 6342834 | Personal security system with alarm location tracking A personal security system locates emergency transmissions and tracks changes in location between successive transmissions. The transmissions are repeated automatically over a predetermined time interval exceeding five minutes. A plurality of fixed receiv... | 01/29/2002 |
| 6163257 | Security system having event detectors and keypads with integral monitor A security system includes cameras disposed for activation by components of the system to record images of activity detected by the components. The system responds to a keypad and/or communications from a public switched telephone network to present the i... | 12/19/2000 |
| 6154525 | Security system with call forwarding activation A security system is configured to enable and disable telephone functions in response to changes in the operational state of the system, such as fully armed, partially armed and disarmed. When the system changes its operational state, it automatically sen... | 11/28/2000 |
| 6107930 | Security system keypad illuminated by proximate motion A security interface device, such as a keypad, includes a proximity detector sensing a human approach and operating a light source to enhance illumination of the device in response to such approach. A timing device switches the illumination source off aft... | 08/22/2000 |
| 5943394 | Event detection system with dialer intercept A dialer intercept module is provided in an event detection system for automatically selecting between alternative communication channels and formats based on detected characteristics of control panel signals. More specific features detect predetermined s... | 08/24/1999 |
| 5898367 | Personal security system with weighted receiver locations A personal security system uses conversion factors that exaggerate the influence of signal strength to locate transmitting communicators. The system includes an alarm center, portable communicators for transmitting wireless signals and a plurality of fixe... | 04/27/1999 |
| 5845555 | Multi-position adjustable work stop assembly A multi-position adjustable work stop assembly employs a traveling gauge assembly that cooperates with independently adjustable and inexpensive location stops. The gauge assembly is moveable along a fence to define a plurality of work locating positions d... | 12/08/1998 |
| 5774051 | Security system with multi-function transmitter A security system including a hand-portable wireless communicator having two keys for selecting and executing signal transmissions that control the system. The function of each key is determined by the order in which the keys are actuated, so the first ac... | 06/30/1998 |
| 5721529 | Individual smoke detector with stored range of acceptable sensitivity A smoke detector is provided with testing apparatus for determining if its sensitivity is within a predetermined acceptable range. The testing apparatus stores in the detector a range representing acceptable sensitivities. When a test is initiated the res... | 02/24/1998 |
| 5717378 | Security system with fall back to local control A security system having a communications link with a central control, including a local network responds: a) to central control when the central communications link is operational; and, b) to local control when the central communications link malfunction... | 02/10/1998 |
| 5705988 | Photoelectric smoke detector with count based A/D and D/A converter A method and apparatus in a smoke detector for comparing an analog signal voltage to a digital alarm threshold and for converting a digital sensitivity value to an analog test voltage. The analog signal voltage is converted to a digital value by: a) charg... | 01/06/1998 |
| 5699043 | Individual smoke detector with sensitivity calibration and monitoring A process and apparatus are provided for calibrating an individual smoke detector prior to installation so its sensitivity can be determined easily throughout its useful life. Representations of detector output signals are stored in the detector prior to ... | 12/16/1997 |
| 5691699 | Security detector with optical data transmitter A security detector including an optical emitter and a controller for determining detector specific values of predetermined parameters and operating the emitter to transmit a code representing the values. The controller periodically initiates test cycles ... | 11/25/1997 |
| 5670943 | Pet immune intruder detection A passive infra-red, pet immune intruder detector includes upper and lower fields-of-view or zones. The detector is less sensitive to infra-red targets in the lower zones, compared to the upper zones, and the alarm threshold is set slightly above the leve... | 09/23/1997 |
| 5650766 | Wearable transmitter with optical tamper detection A wearable transmitter assembly includes a housing containing a radio frequency transmitter and tamper detecting circuit that are attached to an appendage of an individual with a buckle and strap. A light emitter and a light sensor are disposed in the hou... | 07/22/1997 |
| 5604493 | Security system transmitter with opposed concave actuators In a security system, a transmitter housing and first and second transmitter actuation elements cooperate to define thumb and finger saddles on opposite sides of the housing. The peripheral edge of the housing and the first and second actuation elements h... | 02/18/1997 |
| 5581237 | Microwave intrusion detector with threshold adjustment in response to periodic signals A microwave intrusion detector is provided with a periodic signal detector that identifies periodic signals not typical of an intrusion and adjusts the alarm threshold in response such identification. The intrusion detector includes an adjustable threshol... | 12/03/1996 |
| 5578989 | Personal security system with system wide testing A personal security system with system wide testing includes a portable transmitter that produces an emergency signal including a personal identification number and an auxiliary code. The auxiliary code may be a test bit which, when set, indicates that th... | 11/26/1996 |
| 5572192 | Personal security system with guard tour features A personal security system including features for monitoring guard tours and other surveillance by security personnel. The security system includes a plurality of hand-portable transmitters, a plurality of fixed receivers and a control station. The transm... | 11/05/1996 |
| 5552765 | Smoke detector with individually stored range of acceptable sensitivity A smoke detector is provided with testing apparatus for determining if its sensitivity is within a predetermined acceptable range. The testing apparatus stores in the detector a range representing acceptable sensitivities. When a test is initiated the res... | 09/03/1996 |
| 5552770 | Glass break detection using multiple frequency ranges Apparatus and a method for detecting glass breaking from an impact. Low frequencies are detected that are characteristics of the glass flexing from the impact, and high frequencies are detected that are characteristic of a) the sound of the impact and b) ... | 09/03/1996 |
| 5543777 | Smoke detector with individual sensitivity calibration and monitoring A process and apparatus are provided for calibrating an individual smoke detector prior to installation so its sensitivity can be determined easily throughout its useful life. Representations of detector output signals are stored in the detector prior to ... | 08/06/1996 |
| 5523740 | Wearable transmitter assembly A transmitter assembly is characterized by a buckle including fasteners for holding a strap and the buckle together on an appendage of an individual independent of a transmitter. The buckle also includes latches for attaching the transmitter to the buckle... | 06/04/1996 |
| 5491476 | Magnetically triggered elapsed time indicator Apparatus for determining when a moving vehicle passes a fixed point characterized by a magnetic field. The apparatus includes first and second magnetic-field sensors spaced apart on the vehicle for producing first and second outputs when the sensors move... | 02/13/1996 |
| 5483223 | Personal security system with end-to-end test A personal security system includes a test feature for end-to-end testing. A portable transmitter produces an emergency signal including a personal identification number and an auxiliary code. The auxiliary code may be a test bit which, when set, indicate... | 01/09/1996 |
| 5467074 | Personal security system with transmitter test mode A portable transmitter produces an emergency signal including a personal identification number and an auxiliary code. The auxiliary code may be a test bit which, when set, indicates that the emergency signal was activated in a test mode and that an emerge... | 11/14/1995 |
| 5450062 | Detection system with reduced sensitivity to pin diode effect An intrusion detection system, including a microwave device and a light emitting diode, is controlled to alternate their operation so the diode is off and not conducting when the microwave is transmitting. During a period when the LED would otherwise be o... | 09/12/1995 |
| 5450061 | Glass break detection using temporal sequence of selected frequency characteristics Apparatus and a method for detecting glass breaking from an impact. Low frequencies are detected that are characteristics of the glass flexing from the impact, and high frequencies are detected that are characteristic of a) the sound of the impact and b) ... | 09/12/1995 |
| 5438317 | Glass break detection with noise riding feature In a glass break detector, noise is removed by averaging the signal before it is analyzed for the characteristics that typically accompany glass breaking events. Low frequency signals, associated with glass flexing before it shatters, are isolated from re... | 08/01/1995 |
| 5416466 | Personal security system with fixed testing transmitters A personal security system includes signaling transmitters and receivers for detecting the transmitted signals. The receivers provide an output representing the received signal strength, which is used in combination with the position of the receiver for l... | 05/16/1995 |
| 5400014 | Smoke detector with dark chamber A smoke detector includes a dark chamber surrounded by a peripheral wall structure having a plurality of nested vanes. The second element of each vane is shorter than the first, and intersects the first element intermediate its ends at an acute angle. Adj... | 03/21/1995 |
| 5373339 | Apparatus and method for separating spliced strips of photographic film Apparatus and methods are provided for separating photographic film strips, adhered to a splice, by restricting movement of the splice and then pulling the film strips longitudinally in opposite directions. According to one feature, the splice adhesive is... | 12/13/1994 |
| 4178091 | Horizontal film processing apparatus Photographic processing of a plurality of film discs is accomplished by rotating the discs partially immersed in chemical solutions. Processing trays, which contain the solutions, conform to the peripheries of the discs, reducing the volumes of the soluti... | 12/11/1979 |
| 4083737 | Method and apparatus for attaching a strip of material transversely of a moving web Apparatus for and method of attaching a strip of a first material having a hot melt adhesive on both sides thereof to a second web of material. A web of first material is advanced toward and through a cutting station a distance substantially equal to the ... | 04/11/1978 |
