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| Number | Title | Issue Date |
| 7346331 | Power management for locking system In an access control system, a method and system for power management. A method of power management in a wireless access control system includes monitoring usage of a transceiver in a remote access point in a wireless access control system, de-activating the transce... | 03/18/2008 |
| 6738628 | Electronic physical asset tracking Objects can be tracked within a building using a radio device associated with each object to be tracked and an array of transmitting beacons. Each of the beacons transmits identification data. The received identification data from the object to be tracked is sent to... | 05/18/2004 |
| 6188715 | Frequency hopping system for intermittent transmission with receiver using individual tracking, FFT, and authentication A radio transmission system including many radio transmitters using frequency hopping carriers to intermittently transmit very short messages indicative of status of sensors associated with the transmitters. In operation, a time interval generator include... | 02/13/2001 |
| 6108377 | Transmitter unit for an anti-theft system of a motor vehicle, and method for operating the transmitter unit A transmitter unit generates a carrier signal in the form of a periodic bipolar signal. The carrier signal has intrapulse periods between two pulses of different polarity. A transmission antenna is operated with the bipolar signal. To prevent the harmonic... | 08/22/2000 |
| 5831546 | Automatic addressing in life safety system An automatic addressing scheme for a life safety system having a local rail, and a plurality of modules inter-connected by the local rail, a first of the modules being a central processing unit, and the remainder being I/O modules having a variety of func... | 11/03/1998 |
| 5630068 | Shoppers communication system and processes relating thereto A communication system for a marketing area locates a light signal generating system and a master computer at a control center and delivers message bearing light signals over optical channels to predetermined subdivisions of the marketing area. Message re... | 05/13/1997 |
| 5210531 | Monitoring and control system with binary addressing A network of addressable modules is disclosed with each module being addressable by a particular multi-digit binary code and each having first and second normally high address input lines which go low only when all the address code digital positions corre... | 05/11/1993 |
| 4825098 | Bidirectional semiconductor device having only one one-directional device In a one-directional internal circuit such as a first-in first-out (FIFO), switchover switches are provided between the internal input/output ports and external ports thereof, and the switches are controlled by a mode signal, thereby enabling a bidirectio... | 04/25/1989 |
| 4761810 | Programmable selective ringing circuit and method for party telephone line An apparatus and method for decoding ringing signals on a party telephone line coupled to the telephone line and a telephone instrument, according to the polarity of a d.c. voltage level present across the telephone line upon which ringing signals are sup... | 08/02/1988 |
| 4721943 | Digital-to-analog converter for video application A digital-to-analog converter comprises a current source for supplying a current of predetermined magnitude to a circuit node, and a switch connected to the circuit node, and defining a first current path leading to a reference potential terminal and a se... | 01/26/1988 |
| 4628308 | Communication network having a master-slave type series architecture and providing master-to-slave and slave-to-master communication A network having a series architecture and comprising an electronic master device (M) and a plurality of electronic slave devices (E1, E2, . . . ). Each electronic slave device is provided with an associated connection device (30) wh... | 12/09/1986 |
| 4411004 | Inductively coupled sensing circuit and priority system An inductively coupled sensing circuit for use on a common cable communications system is disclosed. When used in conjunction with transceivers on a common cable system, the circuit is capable of both detecting signals and determining the direction of any... | 10/18/1983 |
| 4385287 | Multiple alarm condition detection and signalling A security system has a locality station sensing security risks such as fires, electrical faults and break-ins, being powered by a single line from a central station. The loading on the power supply is determined by logic circuits to give direct remote in... | 05/24/1983 |
| 4176317 | Circuit arrangement for determining the frequency dependent amplitude fluctuation characteristic of a communications transmission link A circuit arrangement for correcting and controlling the attenuation characteristic of a communications transmission link by using adjustable attenuators in which a measuring transmitter produces a measuring signal of constant amplitude and at a frequency... | 11/27/1979 |
