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| Number | Title | Issue Date |
| 7301742 | Method and apparatus for accessing and activating accessory functions of electronic circuit breakers An electronic trip unit for a circuit breaker includes a programmed microprocessor and a module plug in removable signal communication with the microprocessor. The module plug includes a program identifier. The microprocessor recognizes the program identifier and ac... | 11/27/2007 |
| 7164337 | Splash proof electromagnetic door holder A splash proof electromagnetic door holder is sealed to prevent failures caused by exposure to moisture. The electromagnetic door holder comprises a ground box, a main housing attached to the ground box, and a coil assembly attached to the main housing. The coil ass... | 01/16/2007 |
| 6924966 | Spring loaded bi-stable MEMS switch A MEMS switch assembly comprising a substrate and a resilient switching member is provided. The resilient switching member comprises a transverse torsion member having a flexible portion, and a leaf spring and cantilever that extend from the flexible portion of the ... | 08/02/2005 |
| 6903562 | Integrated micromachine relay for automated test equipment applications A method and apparatus for a micromachine relay is provided. A pin controller comprises at least one spring pin designed to movably couple the pin controller to a device under test (DUT) to provide signals to the DUT. The pin controller further includes a micromachi... | 06/07/2005 |
| 6876756 | Container security system A container security system comprising a container with a first section and a second section; a touch pad for fingerprint identification attached to the outside of the first section; a sensor with at least one pre-stored fingerprint operatively coupled to the touch ... | 04/05/2005 |
| 6845300 | Control methods for electromagnetic valve actuators An electromagnetically operated valve assembly (28) has a first solenoid (58) and a second solenoid (60). An armature (56) having a valve stem (54) coupled thereto is positioned between the first solenoid (58) and second sol... | 01/18/2005 |
| 6760211 | Remote activation mechanism for equipment hold down and release Remote activation mechanism for equipment hold down and release, composed of a fixed base (1); a disk with capacity to rotate (2); a ring (3) subdivided in independent segments; a helical torsion spring (4) mounted around the segmented, b... | 07/06/2004 |
| 6687553 | Dual gain variable control system A method for controlling a solenoid using a single coil solenoid for both course and fine adjustment. A resistor or series of resistors may be used in parallel/for current controlled solenoids or in series for voltage controlled solenoids for allowing cou... | 02/03/2004 |
| 6597558 | Solenoid system A solenoid assembly including, in order, a circuit breaker side plate, a solenoid, a clamp bracket, and a bridge diode rectifier assembly, all which mechanically and electrically and engage into a precise configuration.... | 07/22/2003 |
| 6400549 | Dual cantilevered electromagnet-based gripping apparatus A dual cantilevered electromagnet-based gripping mechanism has a reduced number of parts and operates with low power demand properties for use in micro-tool applications. Juxtaposed, cantilever-supported electromagnets, to which object engagement elements... | 06/04/2002 |
| 6392866 | High frequency relay assembly for automatic test equipment A low-profile, short signal path relay assembly implementing several relays for use in an integrated circuit tester, a digitizer or other equipment requiring multiple relays, includes a chassis and a signal board mounted within the chassis. Each relay inc... | 05/21/2002 |
| 6326898 | Solenoid plunger position detection algorithm A method and apparatus for diagnosing whether a solenoid in an image forming system is functioning properly is disclosed. An actuating current is sent to a particular solenoid while a current waveform and elapsed time such as pull-in time value are noted ... | 12/04/2001 |
| 6292345 | Method for controlling an electromechanical actuator A method for controlling an electromechanical actuator includes providing an actuator having an actuating element and an actuating drive. The actuating drive has at least one electromagnet with a coil, a movable armature plate, a regulator having current ... | 09/18/2001 |
| 6169651 | Protective relay with modular control panel A modular control panel for a protective relay. The control panel is removably attached to the housing of the protective relay, and the control panel has a frame which can be arranged to receive a plurality of independently replaceable control panel modul... | 01/02/2001 |
| 5991144 | Circuit for tripping breaker An apparatus for tripping a circuit breaker having a trip coil. A trip circuit is coupled at a first node to a first power supply and at a second node to the trip coil. The trip circuit comprises a switch for closing in response to a control signal, a coi... | 11/23/1999 |
| 5933019 | Circuit board testing switch An electro-mechanical reed relay in-circuit test fixture switch is inserted onto a wrapped wire pin extending from the bottom of a socket holding a spring-loaded nail inside a bed-of-nails or equivalent testing fixture. The switch is located at the circui... | 08/03/1999 |
| 5894397 | Multi-purpose passive switching device A switching device has a housing containing a magnetic latching relay that operates a set of contacts to respective closed and open conditions. Plural terminals provide for connection of the switching device with controlling circuitry that operates the re... | 04/13/1999 |
| 5828565 | Solenoid driving circuit for compact disc players for cars A solenoid driving apparatus for a compact disc player (CDP) for use in cars which enables the CDP to operate effectively and to continue to a following operation smoothly utilizing a latch type solenoid. The apparatus includes a disc detecting section fo... | 10/27/1998 |
| 5818680 | Apparatus for controlling armature movements in an electromagnetic circuit An electromagnetic circuit for controlling armature movement includes a holding magnet having a magnet yoke provided with a pole face; a solenoid connected to the magnet yoke; a movably supported armature arranged for reciprocating motion toward and away ... | 10/06/1998 |
| 5610794 | Door holder having electromagnetic flux generator and power control circuit A doorholder for retaining a door in an open position by magnetic interaction with an armature secured to the door has an electromagnetic flux generator which includes a core having a face confronting the armature and a coil of wire surrounding the core. ... | 03/11/1997 |
| 5566376 | Electromagnetic coil for use in a door holder system An electromagnetic coil for use in a doorholder for retaining a door in an open position by magnetic interaction with an armature secured to the door includes a coil of wire for surrounding a core within a cup. A power control circuit including a resistor... | 10/15/1996 |
| 5561583 | Particulate-removal rapper-controller For dislodging of particulate material from precipitator plates, high voltage electrodes, hoppers, conveyance ductwork, etc., an electro-mechanical rapper module is removably combined with an electronic controller module in a single cylindrical unit that ... | 10/01/1996 |
| 5555484 | Electromagnetic door holder system An electromagnetic doorholder for retaining a door in an open position by magnetic interaction with an armature secured to the door. The doorholder includes a core having a face confronting the armature and a coil of wire surrounding the core. A cup havin... | 09/10/1996 |
| 5467246 | Arrangement for emulating an H-type relay air valve which is utilized in a railway braking system An H-5 relay air valve emulating circuit for use in an electropneumatic railway brake control equipment including an operational amplifier comparator and a solenoid relay. The operational amplifier comparator includes a positive and a negative input and a... | 11/14/1995 |
| 5428497 | Device for driving rotary solenoid A device for driving a rotary solenoid in which the two transistors on one side of an H-bridge circuit that drives the rotary solenoid are not simultaneously rendered conductive in order to prevent the burning. An instruction signal from the CPU is made u... | 06/27/1995 |
| 4810952 | Circuitry and method for controlling power to fastener machine solenoid A method and apparatus for controlling power delivered to a fastening machine solenoid comprises a half wave rectifier, a filter network, an adjustable frequency generator and a pulse conditioning circuit. The frequency of the frequency generator is varie... | 03/07/1989 |
| 4602309 | Control circuit for a bistable solenoid The control circuit according to the invention consists firstly of two control terminals (S1, S2) to which drive pulses of at least two different types can be applied, i.e. a first pulse type (S) designed to obtain one position (S) o... | 07/22/1986 |
| 4481473 | Electromagnet drop time detection method Electromagnetic actuator release characteristics are evaluated by sampling at high frequency the voltage waveform resulting when the magnet coil is deenergized. The samples are converted to a digitally coded form and stored in sequence. The stored values ... | 11/06/1984 |
| 4481555 | Electromagnetic contact device An electromagnetic contact device performs on-off operations for opening and closing an electrical path, without causing the hunting phenomenon between the two contact points in the device not only during closure of a fixed contact point and a movable con... | 11/06/1984 |
| 4246559 | Electro-magnetic relay structure A latching relay employing an electro-magnetic relay coil having associated therewith opposite end armatures. This relay coil receives operating power by way of an input contact member. One of the armatures carries a manually operated switch which also in... | 01/20/1981 |
| 4038584 | Protective arrangement for dependent switching circuits This invention comprises a fusible resistor in a solid state relay comprising two solid state switches connected in parallel with each other, but in series with a load and a source of current. When the first of the two switches is switched on, the second ... | 07/26/1977 |
| 4037183 | Replaceable solid state trip unit A molded case multi-pole circuit breaker is provided with a removable and replaceable solid state trip unit constructed with all fault current detecting elements within a common housing. For each circuit breaker pole the trip unit includes an input and an... | 07/19/1977 |
| 4013931 | Voltmetric system comprising an electromagnetic relay A system of electromagnetic relays supplied by a substantially d.c. input voltage, comprising a unijunction transistor, whereof, between the electrodes, the connection of the two bases and the connection of the emitter and one of the bases are connected i... | 03/22/1977 |
