Miscellaneous Patents (Class 439/894)
  • Publication number: 20020127924
    Abstract: The covering sheet includes at least one magnetic material layer made of a resin compound having an oxide magnetic material or a metal magnetic material mixed therein, a ground conductor layer laminated on one surface of the magnetic material layer, and a plurality of via holes for passing conducting unit for grounding the ground conductor layer, or includes a laminate consisting of at least one magnetic material layer made of a resin compound having an oxide magnetic material or a metal magnetic material mixed therein and at least one dielectric layer having a permittivity lower than that of the magnetic material layer, and a ground conductor layer laminated on one surface of the laminate.
    Type: Application
    Filed: November 26, 2001
    Publication date: September 12, 2002
    Applicant: TDK Corporation
    Inventors: Taro Miura, Yoshikazu Fujishiro
  • Publication number: 20020123276
    Abstract: The invention relates to a network comprising a plurality of sub-networks which each include terminals and which exchange data with each other via at least one bridge terminal. A controller for controlling a sub-network connects at least one other bridge terminal for data transfer between at least two sub-networks. The bridge terminals are synchronized with only one sub-network during certain periods.
    Type: Application
    Filed: February 13, 2002
    Publication date: September 5, 2002
    Inventor: Joerg Peetz
  • Patent number: 6441297
    Abstract: The invention relates to a solar cell arrangement consisting of series-connected solar subcells. Said solar subcells consist of a semiconductor wafer which forms a common base material for all of the solar subcells and wherein a number of recesses are provided for delimiting the individual, series-connected solar subcells. The invention is characterised in that at least some of the recesses extend from the top surface of the semiconductor wafer, through the wafer itself to the bottom surface and in that at most some bridge segments are left in continuation of the recesses as far as the wafer edge, to mechanically interconnect the solar subcells.
    Type: Grant
    Filed: October 23, 2000
    Date of Patent: August 27, 2002
    Inventors: Steffen Keller, Peter Fath, Gerhard Willeke
  • Publication number: 20020114665
    Abstract: An electronic housing system is provided which includes at least two, especially plate shaped, electronic housings which can be snapped onto a mounting rail. The housing system includes a locking system including at least two housing portions, namely a starter unit and an end unit, and a key element. The starter unit is constructed as a key receptacle and the end unit is constructed as a lock complementary to the key element. The two housing portions can be locked with one another by rotation of the key element in the end unit. The locking system further includes an intermediate housing portion for positioning between the starter unit and the end unit, whereby the intermediate portion has an intermediate end unit for interlocking with the end of the key element, and an intermediate starter unit.
    Type: Application
    Filed: November 28, 2001
    Publication date: August 22, 2002
    Inventors: Dirk Quardt, Jorg Sofker, Reinhard Gottlieb Starzinger, Hans Peter Wintersteiger
  • Publication number: 20020106945
    Abstract: A compressor terminal fault interruption method and interrupter for disconnecting power to a compressor terminal when terminal venting failure is imminent including a current sensing circuit for sensing current provided to the terminal by a power source and outputting a sensed signal representing the current provided to the terminal and a control circuit. The control circuit includes a first circuit for outputting a reference signal representing input current much higher than locked rotor current, a second circuit connected to the current sensing circuit and the first circuit for comparing the sensed signal to the reference signal, and a third circuit connected to the second circuit for disconnecting power to the terminal when the sensed signal exceeds the reference signal, thereby preventing excessive current from reaching the compressor terminal.
    Type: Application
    Filed: December 11, 2001
    Publication date: August 8, 2002
    Inventors: Arnold G. Wyatt, Alex Alvey
  • Publication number: 20020096942
    Abstract: The invention relates to a bus access unit for a pluggable electrical unit (2) with module electronics (22) for electrical connection to an electrical base unit (1). The base unit (1) comprises a power supply (11), a signal processing means (12) and signal lines (31) for identification, control lines (32, 33), address lines (34) and data lines (35), which are connected in the manner of a bus to a plurality of contact devices (13). The bus access unit has a variable resistor (26) and means (281, 282, 283, 284) for isolation. It is proposed to arrange the variable resistor (26) and the means (281, 282, 283, 284) for isolating signal lines (31′/31″) for identification, control lines (32′/32″, 33′/33″), address lines (34′/34″) and data lines (35′/35″) in the pluggable electrical unit (2) and link them to one another in a causal chain.
    Type: Application
    Filed: October 23, 2001
    Publication date: July 25, 2002
    Inventors: Andreas Goers, Helmut Michel, Reiner Bleil
  • Publication number: 20020077006
    Abstract: The invention relates to a method of initializing a pluggable electrical unit (2) in a modular system comprising a base unit (1) and at least one pluggable electrical unit (2) connected via an interface (3). Each pluggable electrical unit (2) has module electronics (22) and a read-only memory (21) with clearly identifying identifiers. The interface (3) is equipped with a variable resistor (31) arranged in a feed line. The readonly memory (21) is disconnected from the base unit (1) via first switching means (33) and the module electronics (22) are disconnected from the base unit (1) via second switching means (34). It is proposed to establish the connection between the base unit (1) and the pluggable electrical unit (2) initially only partially, and only to the read-only memory (21), after switching on the power supply to the pluggable electrical unit (2).
    Type: Application
    Filed: October 23, 2001
    Publication date: June 20, 2002
    Inventors: Andreas Goers, Helmut Michel, Reiner Bleil
  • Publication number: 20020077005
    Abstract: A communication connecting device includes a terminal unit controller for temporarily storing data received from a sending terminal unit. A packetizer/depacketizer collectively codes the data sequentially read out in accordance with size information fed from a size information storage. The packetizer/depacketizer determines whether or not the data is control data and delivers, if the answer of the decision is positive, a notification control signal to a control data monitor. A UDPTL (facsimile User Datagram Protocol Transport Layer protocol) controller feeds a UDPTL packet input from the packetizer/depacketizer to the control data monitor in accordance with ITU-T (International Telecommunication Union-Telecommunication standardization sector) Recommendation T.38. The control data monitor repeatedly sends the UDPTL packet on the basis of the notification control signal.
    Type: Application
    Filed: August 21, 2001
    Publication date: June 20, 2002
    Inventors: Katsutoshi Tajiri, Takashi Noda, Rika Kamimura
  • Patent number: 6396689
    Abstract: A computer mainframe cooling structure includes a mounting plate adapted for fastening to the bottom side wall of a hard diskdrive in a computer mainframe, the mounting plate having at least one suction hole and a plurality of retaining holes spaced around the at least one suction hole, and at least one fan holder shell respectively fastened to the mounting plate around to hold a respective fan corresponding to the at least one suction hole for quick dissipation of heat from the hard diskdrive, the at least one fan holder shell each having a plurality of retaining hooks respectively fastened to the retaining holes of the mounting plate.
    Type: Grant
    Filed: August 2, 2000
    Date of Patent: May 28, 2002
    Inventors: Ming-Chuan Yu, Chung Che Yu
  • Patent number: 6352628
    Abstract: A refractory metal silicide target is characterized by comprising a fine mixed structure composed of MSi2 (where M: refractory metal) grains and Si grains, wherein the number of MSi2 grains independently existing in a cross section of 0.01 mm2 of the mixed structure is not greater than 15, the MSi2 grains have an average grain size not greater than 10 &mgr;m, whereas free Si grains existing in gaps of the MSi2 grains have a maximum grain size not greater than 20 &mgr;m. The target has a high density, high purity fine mixed structure with a uniform composition and contains a small amount of impurities such as oxygen etc. The employment of the target can reduce particles produced in sputtering, the change of a film resistance in a wafer and the impurities in a film and improve yield and reliability when semiconductors are manufactured.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: March 5, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Michio Sato, Takashi Yamanobe, Tohru Komatsu, Yoshiharu Fukasawa, Noriaki Yagi, Toshihiro Maki, Hiromi Shizu
  • Patent number: 6220903
    Abstract: The present invention relates to a plastic housing structure of a board-to-board connector comprising a base seat and a top cap, wherein the base having a central protruded rib portion with a plurality of slots along the two lateral sides of the rib portion, a through hole being formed at the bottom portion of the slot and the external side of the slot being corresponding to a plurality of notches having a sloping guiding surface at the inner surface thereof, at the two ends of the rib portion, an engaging surface being provided for engagement with a top cap, and the top surface of the engaging surface being provided with a blocking block and a protrusion; and the top cap is provided with an engaging portion at the side thereof, and the bottom portion is provided with a plurality of protruded blocks having a wavelike surface at the inner side thereof, thereby, the base seat and the top cap are combined, and the protruded blocks are inserted into the notches.
    Type: Grant
    Filed: December 13, 1999
    Date of Patent: April 24, 2001
    Assignee: CviLux Corporation
    Inventor: Alex Huang
  • Patent number: 6213819
    Abstract: A detachable fan rack includes a mounting frame, and a fan holder, the mounting frame having a receiving opening, a plurality of hook holes, a plug hole, a locating notch and a plug hole spaced around the center opening, the fan holder being mounted on the mounting frame to hold a fan in the center opening on the mounting frame, the fan holder including a holder base and a locking plate, the holder base having bottom mounting legs respectively hooked in the hook holes on the mounting frame, a plug mount holding an electric plug, a clamping plate clamped on the retaining portion at the mounting frame, a hook at one side, and a positioning member positioned in the locating notch on the mounting frame, the locking plate being coupled to the holder base at one side and turned between a first position where the locking plate is engaged into the plug hole on said mounting frame and hooked up with the hook at the holder base to lock the fan holder, and a second position where the locking plate is disengaged from the
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: April 10, 2001
    Assignee: Enlight Corporation
    Inventor: Cheng-Yuan Fan
  • Patent number: 6144122
    Abstract: A switch assembly has a reversible switch with an activation member, electronics, and a plurality of contacts to couple the electronics with a power source. A connector assembly is coupled with the switch assembly contacts. The connector assembly includes a first one-piece connector having a circuit portion coupled with a plurality of contacts. Also, the first connector includes a terminal portion continuous with the circuit portion and connected directly with a positive terminal of the power source. A second one-piece connector has a circuit portion coupled with a second plurality of contacts. The second connector also includes a terminal portion continuous with the circuit portion and directly coupled with a negative terminal of a power source.
    Type: Grant
    Filed: March 2, 1999
    Date of Patent: November 7, 2000
    Assignee: Black & Decker Inc.
    Inventors: Kevin W. Covell, Michael R. Sell
  • Patent number: 6132266
    Abstract: A connector for communications systems has four input terminals and four output terminals, each arranged in an ordered array. A circuit electrically couples each input terminal to the respective output terminal and cancels crosstalk induced across the adjacent connector terminals. The circuit includes four conductive paths between the respective pairs of terminals. The first and third paths are in relatively close proximity and are substantially spaced from the second and fourth paths. The second and fourth paths are in relatively close proximity.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 17, 2000
    Assignee: Hubbell Incorporated
    Inventors: Daniel E. Klas, William J. Rose
  • Patent number: 5943208
    Abstract: A mechanism for mounting a storage device such as a magnetic disk device to a terminal device, capable of simplifying the attachment/detachment of the storage device, requiring a smaller number of parts for the attachment/detachment and preventing external shock from reaching the storage device. Storage devices are mounted to a frame made of a flexible material such as resin which, in turn, is fastened to a terminal device, without screws, by inserting a portion of the frame into a hole on the terminal device. Means made of a flexible material are provided on the upper surface of the frame for fastening the storage devices for absorbing the external shock or vibration by the elasticity thereof.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: August 24, 1999
    Assignee: Fujitsu Limited
    Inventors: Shinichi Kato, Hiroshi Nagao
  • Patent number: 5738547
    Abstract: This is a unit or structure that can be used to easily convert a foot pedal operated toy vehicle to other than foot operation. This is to provide children who do not have the use of their legs the ability to still enjoy playing with this type toy. The unit has relatively low cost components that are readily accessible and easy to install.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: April 14, 1998
    Inventor: Ernest Russo
  • Patent number: 5571035
    Abstract: This disclosure relates to a high performance electrical connector, such as a modular plug, for example, used in high frequency data transmission systems, where such connector is intended to be mated to a receptacle type connector. The modular plug comprises a dielectric housing having a conductor receiving end, a conductor terminating end, a passageway communicating internally between the respective ends, and a spacing or insert in the passageway to receive and/or separate a plurality of conductors and to position them in a manner to improve the crosstalk performance of the modular plug. A preferred insert is characterized by having an upper surface and a lower surface to space or separate selected pairs of the conductors. Within the limits of the housing, the insert or spacing maximizes the separation of the selected pairs and arranges them in plural planes before being realigned into a common plane for termination at the conductor terminating end.
    Type: Grant
    Filed: October 31, 1994
    Date of Patent: November 5, 1996
    Assignee: The Whitaker Corporation
    Inventor: Jess B. Ferrill
  • Patent number: 5562479
    Abstract: Disclosed is an electrical connector. A first section of the connector includes a portion for mating with another connector, A second section of the connector includes conductors in an essentially side-by-side alignment to produce crosstalk having a polarity opposite to that of the mating section.
    Type: Grant
    Filed: June 21, 1994
    Date of Patent: October 8, 1996
    Assignee: AT&T Corp.
    Inventors: Constance R. Pallas, Clifford L. Winings
  • Patent number: 5547405
    Abstract: An electrical connector is provided with at least two pairs of signal-carrying contacts, which provides a low cost, compact, and rugged construction for minimizing crosstalk. While two initial contacts (A, B, FIG. 2) of the two pairs (102, 104) lie adjacent to each other, so there is unwanted capacitive and inductive coupling between them, secondary contacts (C, D) of the two pairs do not lie adjacent to the initial contacts and therefore are not as closely coupled to the initial contacts. Each secondary contact is capacitively coupled to an initial contact of the other pair by a lateral extension (110, 122) formed in one of the contacts which overlies the other contact in a local region (120) of limited length. The capacitive coupling resulting from the lateral extensions substantially cancels crosstalk that otherwise would exist.
    Type: Grant
    Filed: September 23, 1994
    Date of Patent: August 20, 1996
    Assignee: ITT Industries Limited
    Inventors: David R. Pinney, Kevin Stanton
  • Patent number: 5533917
    Abstract: A card for indicating the relative positions of conductors to be connected to an appliance comprises a panel element independent of the appliance and representing a duplicate image of a portion of the appliance to which the conductors are to be connected. The panel element includes a plurality of openings provided therein, each of the openings being formed to frictionally retain one of the conductors at a location on the panel element corresponding to the exact location of the conductor when connected to the appliance.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: July 9, 1996
    Inventor: David P. Schmitz
  • Patent number: 5432484
    Abstract: A connector for communications systems has four input terminals and four output terminals, each arranged in an ordered array. A circuit electrically couples each input terminal to the respective output terminal and cancels crosstalk induced across the adjacent connector terminals. The circuit includes four conductive paths between the respective pairs of terminals. The first and third paths are in relatively close proximity and are substantially spaced from the second and fourth paths. The second and fourth paths are in relatively close proximity.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: July 11, 1995
    Assignee: Hubbell Incorporated
    Inventors: Daniel E. Klas, William J. Rose
  • Patent number: 5431584
    Abstract: This invention is directed to an improved system for reducing crosstalk in an electrical connector, where a typical connector is a multi-contact electrical connector comprising a pair of intermatable connector members, where each connector member is adapted to be terminated to plural conductors. A typical connector comprises a housing formed of an insulative material having a conductor receiving side, a mating side, and a plurality of contact receiving cavities extending from the conductor receiving side to said mating side. The cavities are arranged in rows on a spaced-apart parallel axes, where adjacent rows are separated by an insulative housing wall. An array of electrical contact terminals are provided in the cavities. A preferred system hereof is the provision of an electronic device in the form of a thin dielectric film, having plural discrete electrically conductive traces along a first surface thereof, where the first surface is arranged adjacent the insulating wall underlying the contact terminals.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: July 11, 1995
    Assignee: The Whitaker Corporation
    Inventor: Julian J. Ferry
  • Patent number: 5414393
    Abstract: A connector for communications systems has four input terminals and four output terminals, each arranged in an ordered array. A circuit electrically couples each input terminal to the respective output terminal and cancels crosstalk induced across the adjacent connector terminals. The circuit includes four conductive paths between the respective pairs of terminals. Each conductive path includes a plurality of conductive strips arranged in a zig-zag pattern with alternating strips mounted on opposite sides of the substrate and connected end-to-end by conductive devices passing through the substrate. The first and third paths are in relatively close proximity with conductive strips of the first path crossing conductive strips of the third path on opposite sides of the substrate to simulate a twisted wiring pair.
    Type: Grant
    Filed: January 15, 1993
    Date of Patent: May 9, 1995
    Assignee: Hubbell Incorporated
    Inventors: William J. Rose, Robert Aekins
  • Patent number: 5403200
    Abstract: An electric connecting block having a lead frame for interconnection of jack wires of a modular jack thereof with insulated telephone wires, the lead frame including a plurality of conductors disposed on the same plane with either two adjacent or non-adjacent conductors arranged into wire pairs, wherein the conductors have each an intermediate section made gradually thinner toward the modular jack, the intermediate sections of the conductors being obliquely extended toward a center line through said modular jack; either two adjacent conductors which form a wire pair have a respective triangularly curved segment vertically curved in reversed directions and bridging over each other with a space defined therebetween.
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: April 4, 1995
    Inventor: Michael Chen
  • Patent number: 5358414
    Abstract: A multi-terminal electrical connector having two rows of terminals on one side of a dielectric housing and two rows of terminals on the other side. On one side pairs of terminals are laterally spaced from row to row. Conductors extend through the connector to connect terminals of each pair on one side to terminals of an associated pair on the other side. In one structure, the conductors to alternating conductor pairs on each side are spaced apart laterally of the rows while for the other pairs, the conductors cross over each other. In another structure, the conductors of each of the pairs are spaced laterally and a spacer is provided to cause alternate pairs of untwisted wires to be spaced laterally and the wires of the other pairs to cross over each other. In both structures, the arrangement reduces crosstalk.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: October 25, 1994
    Assignee: Northern Telecom Limited
    Inventors: Paul P. Kish, Joseph Maroun
  • Patent number: 5350324
    Abstract: A wall socket or patch panel (distribution frame) has pairs of incoming conductor wires connected into terminal pairs in one connector. Wires passing between that connector and another connector are then twisted together with wires associated with other pairs. This provides a compensating reactive coupling to a parasitic reactive coupling existing between conductors within the connectors.
    Type: Grant
    Filed: March 25, 1993
    Date of Patent: September 27, 1994
    Assignee: Northern Telecom Limited
    Inventor: Paul-Andre Guilbert
  • Patent number: 5295869
    Abstract: An electrically balanced connector assembly is presented. The assembly comprises a printed circuit board including integrally defined capacitive elements designed to compensate for reactive imbalance of electrical components connected thereto. A pair of wire termination blocks mounted to a first side of the circuit board are connected by circuitry on the circuit board to a corresponding pair of modular jacks mounted to a second side of the circuit board. The capacitive elements are connected between selected leads of the modular jacks and the wire termination blocks by the circuitry. The circuit board assembly is mounted in a panel yoke which includes a pair of apertures for allowing access to the modular jacks aligned therein. The apertures and circuit board assembly are orientated to allow connecting modular cords to gravity feed into and from the modular jacks. The panel yoke includes means for snaplockedly securing the panel yoke to a panel or a wall plate.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: March 22, 1994
    Assignee: The Siemon Company
    Inventors: John Siemon, Randy Below
  • Patent number: 5211590
    Abstract: A repairable cable termination comprising a cable transition adapted to receive an electrical cable. The cable transition including a first tubular region adapted to receive an outer shield of the cable, an antirotation sprocket and a second tubular region adapted to receive the inner shields of the wires in the cable. The cable termination further comprising top and bottom shells adapted to fit over the cable transition piece and including teeth adapted to engage the antirotation sprocket and prevent the cable transition from rotating relative to the top and bottom shells. The top and bottom shells being further adapted to fit over one end of the electrical connector and engage an antirotation sprocket attached thereto. The bottom shell including slots adapted to receive the ends of a C-clip which may be snapped over the top shell to hold the top and bottom shells together.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: May 18, 1993
    Assignee: General Electric Company
    Inventors: Kimberly P. Smith, William W. Stockton, Jr.
  • Patent number: 5125857
    Abstract: A method and apparatus is presented for facilitating the installation of electrical cables in sub-zero temperatures by heating the cables to make them more flexible and easier to work with. The cables and the workers thereon are sheltered from the elements to enhance the safety of the workers and improve the useful operating life of the equipment.
    Type: Grant
    Filed: February 13, 1991
    Date of Patent: June 30, 1992
    Assignee: Nabors Industries, Inc.
    Inventor: David A. Mochizuki
  • Patent number: 5077450
    Abstract: A high-voltage test terminal for interconnection between high-voltage power lines and the bushing stud member of a transformer or reactor. An insulator component of the terminal is placed in compression rather than tension, the terminal having a substantially reduced moment arm to withstand angular forces which are created upon interconnection between the power lines and the stud member. Metallic end fittings for the insulator serve to maintain the insulator in permanent compression and provide ready disconnection of the bus bars of the terminal for determination of induced electrical currents such as by Doble testing. The insulator is mounted horizontally between the end fittings and between the power lines in substantially parallel and horizontal alignment therewith, and eliminates the torsional stresses which have been generated previously with upright post-type insulators.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: December 31, 1991
    Inventor: Masoud Rafiee
  • Patent number: 4736604
    Abstract: A housing (20) provided with a flexible cord (10) for connecting said housing to a living object or to an inanimate object, said housing receiving a plug (30) including two through cavities (31A, 31B) each of which receives a tag (11A, 11B) fixed to a corresponding end of the flexible cord, said housing including two shoulders (24A) each serving as an abutment for a corresponding one of the tags, said abutments ensuring, once the plug has been fully inserted into the housing, that both ends of the cord are definitively retained in the housing, said housing further including an abutment (34) defining an end-of-insertion position for the plug.
    Type: Grant
    Filed: March 12, 1987
    Date of Patent: April 12, 1988
    Assignee: D'Automatisme CGA-HBS
    Inventors: Zeller, Jacques, Claude Morin
  • Patent number: 4712850
    Abstract: A terminal strip comprises a plurality of edge clips for attachment to contact pads on a circuit bearing board, in which each clip is crimped onto a non-conductive carrier bar or strip for supporting the clips. The clips are formed in a stamping process and are crimped to the non-conductive carrier strip during the stamping process.
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: December 15, 1987
    Assignee: North American Specialties Corp.
    Inventor: Jack Seidler
  • Patent number: 4702539
    Abstract: A connector assembly includes first and second connectors which may be coupled by advancing a connector post on the first connector into a corresponding recess on the second connector. The assembly may then be fully engaged by 180.degree. rotation of one of the connectors about a longitudinal axis. Indicia on the connectors enable an operator to quickly ascertain whether the assembly is in engaged or disengaged position.
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: October 27, 1987
    Assignee: Tweco Products, Inc.
    Inventors: Joseph B. Cusick, III, Ty A. Raney
  • Patent number: 4679890
    Abstract: A pin terminal for reducing the insertion force required to engage a connector with a mating contact terminal. The pin comprises a generally quadrilateral configured conducting member having one end formed with opposite curvilinear surfaces of different radii to generate a sequential deflection on blades of the contact terminal blades as the pin member is inserted into the contact terminal.
    Type: Grant
    Filed: October 21, 1985
    Date of Patent: July 14, 1987
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventor: Solomon S. Fineblum
  • Patent number: RE34484
    Abstract: Gold-plated electronic components are disclosed, as well as a process for producing the same, wherein an alloy of nickel and cobalt or an alloy containing these elements as essential ingredients is used as an undercoat for the gold-plated layer.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: December 21, 1993
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Teruyoshi Nagashima, Akio Takami, Akiyo Kasugai