|
Match
|
Document |
Document Title |
|
|
5739999 |
Current limiting circuit
A current limiting circuit for use in broadband and combined broadband and telecommunications networks is described. A current limiting element is triggered into a high impedance state in the event...
|
|
|
5734542 |
Dual-line dual-voltage telecommunications surge protector
A surge protection module which provides surge protection for at least two telecommunications lines, with some wires of each telecommunication line being protected according to a first limiting...
|
|
|
5729419 |
Changed device model electrostatic discharge protection circuit for output drivers and method of implementing same
An output circuit for an integrated circuit which provides protection for the integrated circuit during a charged device model (CDM) electrostatic discharge (ESD) event. The output circuit includes...
|
|
|
5726853 |
High voltage protection circuit for telephone test set
An overvoltage protection circuit prevents damage to the electronic circuitry of a craftsperson's test set, in the event of accidental application of a potentially destructive high voltage to one...
|
|
|
5724220 |
Coaxial transmission line surge arrestor with fusible link
Apparatus for protecting a coaxial transmission line using a coaxial transmission line surge arrestor and a fusible link connected thereto. The surge arrestor comprising a gas discharge tube having...
|
|
|
5721663 |
Overvoltage protection modules with back-up protection for communication lines
A miniature station overvoltage protection module having a surge protector device and a back-up protector suitable for use on communication lines, includes a hollow housing having a top surface; a...
|
|
|
5721773 |
Lightning protected maintenance termaination unit
Disclosed is a maintenance termination unit which is protected against lightening strikes and excessive currents. Resistors are placed in series with the tip and ring switches of the unit. Voltage...
|
|
|
5718593 |
Polarity-sensitive protector device
Disclosed is a voltage and current protector device designed for insertion in connecting blocks. The current and voltage protection elements of the protector are mounted on a printed circuit board...
|
|
|
5717558 |
Electrostatic discharge protection for an electrical device
Electrostatic discharge (ESD) protection for an electrical device is provided through an arrangement which detects an ESD event occurring in the device and reconfigures a processor in the device...
|
|
|
5717561 |
Sharing arrangement for surge protection circuitry
Transient voltage surge protection circuitry for a plurality of transmission line-pairs (10-18) utilizes a single multi-terminal protective network (34) coupled to individual lines (52-56) of the...
|
|
|
5703944 |
Network interface device
Disclosed is a device for providing an interface between a customer and a combined telecommunications and cable TV network. The device includes a bottom portion including cable TV interdiction...
|
|
|
5696660 |
Line current protection circuit for use with a PCMCIA-architecture modem card
A novel line-current protection circuit that is useable with a PCMCIA modem card is disclosed. The protection circuit is adapted to detect when an excessive voltage is present across the tip and...
|
|
|
5696820 |
Telephone and data communications line conditioner system
A line conditioner system is provided for use with an in-line wire terminating base for terminating a plurality of telephone line pairs. The line conditioner system includes an electrical...
|
|
|
5694284 |
Discharge type surge absorbing element and method for making the same
A discharge-type surge absorbing element that absorbs a surge by using the discharge that occurs between a discharge interval arranged within a sealed container filled with a discharge gas. The...
|
|
|
5694285 |
Overcurrent automatic prevention apparatus having an individual fault display and permanent ground functions
An improved overcurrent automatic prevention apparatus having an individual fault display and permanent ground functions capable of automatically detecting whether overcurrent flows to a switch,...
|
|
|
5691872 |
Single line, multiple line telecommunications surge protector
A surge protection circuit having x protected paths, a first input connector connected to all x of the protected paths and a second input connector connected to fewer than x of the protected paths....
|
|
|
5689396 |
Signal input unit for semiconductor memory device
A signal input unit for a semiconductor memory device comprising a signal input terminal, an electrostatic discharge protection circuit for discharging an electrostatic signal of high level from...
|
|
|
5684667 |
Full failure protector module
A protector module includes two input prongs receiving electrical signals from an outside plant, two output prongs outputting electrical signals to exchange equipment, a ground prong for grounding...
|
|
|
5684322 |
Sensitive protection component for a subscriber line interface circuit
A high-speed monolithic protection semiconductor component implements two NPN transistors and two diodes. The cathodes of the diodes and the collectors of the transistors are connected to a common...
|
|
|
5684666 |
Photoelectric switch
A novel semiconductor switching device for use in high voltage applications (typically ranging from 5 kV up to about 50 kV) makes use of the well-known effect of reverse conduction in silicon...
|
|
|
5680288 |
Hot plugging of an adapter card
A circuit senses an insertion of an adapter card into a connector coupled to a processor by an MCA bus and signals control logic, which forces all other adapter cards coupled to the MCA bus off of...
|
|
|
5677820 |
Telephone and communications line overvoltage protection apparatus
An overvoltage protection apparatus is used with a pair of telephone or communications TIP/A and RING/B lines including voltage clamping circuitry for clamping voltage signals on the lines at a...
|
|
|
5675468 |
Apparatus and method for protecting equipment against electrical power surges
Apparatus and method for protecting equipment against electrical power surges which is not `ground-centered`. A protection circuit in accordance with this invention comprises at least (a) two input...
|
|
|
5671110 |
Ground skew protection method and apparatus
A method and apparatus are provided for protecting a non-isolated data communications cable against ground skew used with an AC power source. A current summing transformer is coupled to an AC power...
|
|
|
5668866 |
Apparatus for protecting a subscriber line interface circuit against overvoltages
An apparatus interfaces with a subscriber line interface circuit (1) and protects the interface circuit (1) against overvoltages exceeding a supply voltage source supplied to the subscriber line...
|
|
|
5661624 |
Foldback current limiting of a telephone line switch
A telephone having a semiconductor line switch TR1 is protected from excess line voltage or current by the use of current foldback techniques. A current sensing resistor R6, in series with the line...
|
|
|
5646812 |
Telephone line surge protector module with fast-acting, high resistance heat coil assembly
A telephone line surge protector module with fast-acting, high resistance heat coil assembly includes a plurality of turns of resistive heating wire having a conductive core, a heat-resisting...
|
|
|
5636274 |
Switch controller and method
A circuit and method for reducing power consumption during operation of a solid state switch that controls connection of a source of alternating current to a load includes a circuit for determining...
|
|
|
5631797 |
Overvoltage protector
An overvoltage protection circuit using a diode bridge and a thyristor. The inputs to the bridge (first and second terminals) are coupled to a telephone line to be protected. The positive output of...
|
|
|
5628650 |
Termination unit for telecommunication and data lines
A termination unit for telecommunication and data lines, including a front portion provided with an insertion opening, a frame, an electrical plug connector, a plug socket and contact elements for...
|
|
|
5629826 |
Retractable cord surge protector
An inexpensive, compact, portable, retractable cord, visual indicator, electrical/telephone connector-type surge protector, which comprises a housing composed of a molded plastic, with two female...
|
|
|
5627711 |
Self-protected semiconductor protection component
A monolithic protection semiconductor component is connected between a first semiconductor region apparent on a first surface of a semiconductor chip and a second semiconductor region apparent on a...
|
|
|
5627721 |
Protector cartridge for modular connector blocks
A surge protection cartridge adapted for use with a double-sided modular connector block system. The protector cartridge advantageously mounts in the front or rear of a connector module of the...
|
|
|
5623388 |
Overvoltage protection circuits
A miniature solid state overvoltage protection circuit for use on telephone lines using a solid state circuit arrangement connected between the tip terminal and the ground terminal and another...
|
|
|
5621602 |
Surge protector
A surge protector includes a housing having therein a wire wound resistor and a fuse separated by a partition wall. In one embodiment for use with high density information transmission, the...
|
|
|
5596470 |
Fault current protection circuit for an auxiliary device in a digital telephone system
A fault current circuit apparatus for an auxiliary device connectable to telecommunications terminal devices, particularly a telephone set, in a digital telephone system is provided. In addition,...
|
|
|
5596475 |
Protector device
Disclosed is a voltage and current protector device designed for connecting blocks with a high density of contacts. Thermal overload protection is provided through a special ground connector with...
|
|
|
5581428 |
Mounting clip with back-up overvoltage protection
A mounting clip with back-up overvoltage protection which is adapted to receive an overvoltage protection device has dielectric disposed between one terminal of the back-up overvoltage protection...
|
|
|
5579201 |
Modified electrical strip for energizing/de-energizing secondary devices simultaneously with a main device
An electrical power strip device generally including a) an elongate housing having at least one plug-receiving receptacle formed therein; b) a power supply cord extending from the housing and...
|
|
|
5576920 |
Electrostatic destruction preventing circuit and receiving apparatus having the same
An electrostatic destruction preventing circuit for a receiving apparatus, is provided with: a first Zener diode coupled to a receiving terminal of the receiving apparatus; a second Zener diode...
|
|
|
5575689 |
Connector modules
Disclosed is a connector module which permits termination of cross-connect wires on one surface and cable wires on an opposite surface. The module exhibits a generally "Z" shaped configuration...
|
|
|
5574614 |
Protection plug
An over-voltage protection plug for telecommunication installations, including a housing with a printed-circuit board, a voltagesurge suppressor, a slider, a spring, an earth plate, a signalling...
|
|
|
5574615 |
Air spark gap for determining the maximum voltage at a voltage surge suppressor
The present invention relates to an air spark gap for determining the maximum voltage at an aged voltage surge suppressor (5) comprising an electrode arrangement in a capsule filled with an inert...
|
|
|
5572397 |
Combined overvoltage station protector apparatus having maintenance termination and half ringer circuitry
A combined overvoltage station protector apparatus with a maintenance termination and a half ringer circuit arrangement combined with an overvoltage surge arrester mounted in a single housing...
|
|
|
5570263 |
Communications bus surge protector
A surge protector for coupling exposed (to power surges) data communication end ports having a plurality of bi-directional data lines, and protected data communication end ports having a plurality...
|
|
|
5570003 |
Switching device with a feeding circuit for DC power supply to a subscriber's terminal unit
The invention relates to a switching device comprising at least one feeding circuit provided for DC power supply to at least one subscriber's terminal unit. The feeding circuit is especially...
|
|
|
5566040 |
Protection arrangement for an electronic device sensitive to electromagnetic radiation
A protection arrangement for an electronic device sensitive to electromagic radiation comprises a single printed circuit board which is disposed within a metal casing so that it passes...
|
|
|
5563761 |
Transient voltage surge protection assembly for telecommunications lines
An assembly mounted to a grounded chassis and connected between first and second multi-conductor cables carrying a plurality of transmission line-pairs. The assembly provides transient voltage...
|
|
|
5561582 |
Failsafe device for use with electrical surge suppressor
A failsafe device is shown in which a solid state surge suppressor (12) is mounted thermally coupled to a heat transfer element (42). A shorting bar (60) is attached to element (42) by a thin layer...
|
|
|
5559662 |
Fused disconnect switch
A fused disconnect switch including a plurality of maintenance and installation enhancing features is disclosed. For example, a bipolar LED is provided as an alarm indicator so that the fused...
|