Single Screw-threaded Operator Patents (Class 439/791)
  • Patent number: 11349251
    Abstract: Provided are load bearing universal adaptors for connecting electrical cables in a watertight configuration. The mechanical advantage associated with wedges in a tapered cavity ensures that load is appropriately transferred to the walls of the wedge housing and, as the load increases, the gripping force on the electrical cable increases. In this manner, a load applied to the electrical cable is at least partially provided to the walls of the system rather than acting to pull the cable out of the adaptor, and the object to which the adaptor is connected, such as a terminal block.
    Type: Grant
    Filed: February 25, 2021
    Date of Patent: May 31, 2022
    Assignee: In-Situ, Inc.
    Inventors: Michael Ix, Aaron Beese, Elijah Lyle Scott
  • Patent number: 11345247
    Abstract: The evaluation jig comprises a pair of female terminals connectable to a pair of male terminals of a charging connector and an adjustment member capable of adjusting contact resistance of the female terminal and the male terminal. The female terminal is reducible in diameter. The adjustment member includes an annular band attached to an outer peripheral surface of the female terminal and formed in an annulus surrounding the female terminal, a metal band attached to an outer peripheral surface of the annular band and capable of applying external force to the female terminal to reduce the female terminal in diameter, and an adjustment unit capable of adjusting the external force applied by the metal band to the female terminal. The annular band is made of an electrically and thermally insulating material.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: May 31, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hidetoshi Kusumi, Hisato Kawahara, Hiroaki Yuasa
  • Patent number: 11311996
    Abstract: A unitary tool that combines a ground rod to a self-hammering mechanism in a trapped configuration. The ground rod has a length ranging between forty-two and fifty-two inches for facilitating the self-hammering functionality. The ground rod is made from copper-bonded steel for more effectively grounding an electrical connection than the prior art.
    Type: Grant
    Filed: September 2, 2020
    Date of Patent: April 26, 2022
    Assignee: Pine Hill Farm, LLC
    Inventors: Daniel Robert Gardikis, Aaron Pereira
  • Patent number: 11312254
    Abstract: The evaluation jig comprises a pair of female terminals connectable to a pair of male terminals of a charging connector and an adjustment member capable of adjusting contact resistance of the female terminal and the male terminal. The female terminal is reducible in diameter. The adjustment member includes an annular band attached to an outer peripheral surface of the female terminal and formed in an annulus surrounding the female terminal, a metal band attached to an outer peripheral surface of the annular band and capable of applying external force to the female terminal to reduce the female terminal in diameter, and an adjustment unit capable of adjusting the external force applied by the metal band to the female terminal. The annular band is made of an electrically and thermally insulating material.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: April 26, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hidetoshi Kusumi, Hisato Kawahara, Hiroaki Yuasa
  • Patent number: 11309642
    Abstract: A tap connector that includes a tap body and an insulation piercing assembly or module is provided. The insulation piercing assembly is secured to the tap body and movable relative to the tap body. The insulation piercing assembly includes a conductive body, at least two sets of electrically conductive insulation piercing teeth secured to the conductive body and a non-conductive cap or coating covering the teeth. When the teeth pierce the non-conductive caps or coating exposing the teeth, the teeth can pierce insulation surrounding the main and tap conductors creating an electrically conductive path between the main conductor and the tap conductor.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: April 19, 2022
    Assignee: HUBBELL INCORPORATED
    Inventor: Glen Harrison Ruggiero
  • Patent number: 10793151
    Abstract: An installation switching device has a housing and screw connecting clamp with an essentially frame-shaped clamping part having longitudinal faces, narrow faces and broad faces, a head-clamp screw received in a clamping part threaded aperture, and a current rail arranged fixed in the device extending through the frame-shaped clamping part interior, wherein a current rail broad face is oriented, as assembled, parallel to a clamping part broad face facing the head clamping screw, the screw supporting itself, screwed in, on the current rail, wherein consequently, the clamping part is displaceable in its longitudinal direction, parallel to the narrow face, relative to the current rail by further screwing in the head clamping screw so a connecting conductor can be fixedly clamped between the current rail face remote from the screw and the clamping part broad face remote from the screw, the housing having a screw receiving region guiding the screw head.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: October 6, 2020
    Assignee: ABB SCHWEIZ AG
    Inventors: Ralf Weber, Erwin Muders, Klaus-Peter Eppe
  • Patent number: 10490913
    Abstract: A spring-loaded parallel pad clamp connector is provided. The clamp includes a top jaw; a bottom jaw having an eye depending therefrom; one or more springs biasing the top and bottom jaws to a closed position; and a surface positioned a predetermined distance from the eye so that the surface acts as a fulcrum and force translation surface for a lineman hot stick.
    Type: Grant
    Filed: June 9, 2019
    Date of Patent: November 26, 2019
    Assignee: Hubbell Incorporated
    Inventors: Robert Victor De France, Daniel David Dobrinski, Jefferson Robert Hall
  • Patent number: 10084248
    Abstract: The application relates to an electrical connection device (100) including a terminal block (10) adapted for connecting to a lug of an electrical cable. The terminal block (10) comprises a locking sleeve (3) adapted for securing the lug so as to enable translation between the terminal block (10) and the lug. The sleeve (3) comprises a first portion (1) and a second portion (2), as well as a pivot element (13, 14) configured such that the first and second portions (1, 2) pivot relative to one another. The pivot element comprises a pin (14) which is connected to the second portion (2) and engaged with the first portion (1) on the side of the first portion (1) substantially opposite the side of the first portion (1) facing the second portion (2). Advantageously, relative rotational is also allowed. A busbar is preferably connected to the terminal block.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: September 25, 2018
    Assignee: SAFRAN ELECTRICAL & POWER
    Inventors: Benjamin Boisnier, Jean-Luc Biesse
  • Patent number: 9263859
    Abstract: A new connector for attaching conductor wires to a metersocket is disclosed. The design of the connector allows the wires to be laid in along the side of the connector and requires little bending and slack in the wire. Once seated in place, the connector can be secured using a set screw that keeps the conductor wire in place.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: February 16, 2016
    Assignee: THOMAS & BETTS INTERNATIONAL, INC.
    Inventors: Daniel Cardin, Daniel Lalancette
  • Patent number: 9177695
    Abstract: Motor vehicle battery lead with a first connection element for a battery pole, a second connection element for at least one consumer, and a flat conductor arranged between the first connection element and the second connection element. A modular construction with a high degree of flexibility is achieved, in that the flat conductor is formed in a number of parts, wherein at least two parts of the multi-part flat conductor are connected to each other over the course of the flat conductor.
    Type: Grant
    Filed: October 19, 2007
    Date of Patent: November 3, 2015
    Assignee: AUTO KABEL MANAGEMENTGESELLSCHAFT MBH
    Inventors: Franz-Josef Lietz, York Dlugokinski
  • Patent number: 8581450
    Abstract: A system and method that offers the provision too rapidly and safely connect electrical generation sources, including inverters used by solar collecting panels, or wind turbines, and backup hydrocarbon fueled generators or any other supplemental power sources including storage batteries, fuel cells and future electric automobiles. Thus enabling the feeding of power to all circuits in the home or small business, not just isolated circuits in a structure. The system is compliant with electric codes, requires no costly rewiring inside the structure or in the electrical circuit panel and can be accomplished entirely from the outside of the home or small business adjacent to the electric service meter for the home or small business structure.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: November 12, 2013
    Assignee: Renewable Energy Technology Group (RETG)
    Inventor: Michael Leonard Mathiowetz
  • Patent number: 7862389
    Abstract: Terminal block for connecting electric wires comprising an insulating body and a conducting part housed inside it and associated with means for retaining the free end of the electric wire, said conducting part having a U-shaped form.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: January 4, 2011
    Assignee: Morsettitalia S.p.A.
    Inventor: Giordano Pizzi
  • Patent number: 7771241
    Abstract: Terminal block for connecting electric wires comprising an insulating body and a conducting part housed inside it and associated with means for retaining the free end of the electric wire, said conducting part having a U-shaped form.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: August 10, 2010
    Assignee: Morsettitalia S.p.A.
    Inventor: Giordano Pizzi
  • Patent number: 7699669
    Abstract: A screw assembly for use with an electrical connector securing a conductor includes a threaded body configured to be releasably coupled to a coupling portion of the connector. A contacting structure includes a plate spaced from the threaded body and has a flat contacting surface configured for contacting the conductor. The plate is coupled to the threaded body. The plate is rotatable relative to the threaded body when the threaded body is coupled to the coupling portion of the connector. The plate is restricted from movement away from said threaded body when the threaded body is not coupled to the coupling portion of the connector. A spacer may be positioned between the plate and the threaded body and is configured to urge the plate away from the threaded body.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: April 20, 2010
    Assignee: Ilsco Corporation
    Inventors: Thomas M. Sweeney, Kevin Jenkins
  • Publication number: 20090053940
    Abstract: A screw assembly for use with an electrical connector securing a conductor includes a threaded body configured to be releasably coupled to a coupling portion of the connector. A contacting structure includes a plate spaced from the threaded body and has a flat contacting surface configured for contacting the conductor. The plate is coupled to the threaded body. The plate is rotatable relative to the threaded body when the threaded body is coupled to the coupling portion of the connector. The plate is restricted from movement away from said threaded body when the threaded body is not coupled to the coupling portion of the connector. A spacer may be positioned between the plate and the threaded body and is configured to urge the plate away from the threaded body.
    Type: Application
    Filed: August 24, 2007
    Publication date: February 26, 2009
    Applicant: ILSCO CORPORATION
    Inventors: Thomas M. Sweeney, Kevin Jenkins
  • Patent number: 7252534
    Abstract: An electrical connection arrangement for electrical connection of an electrical device with a bottom part for holding at least one device-side cable, with a top part for holding at least one connection-side cable and with a contact body for electrical connection of the device-side cable to the connection-side cable, the bottom part and the top part being formed essentially of an electrically insulating material. The connection is improved in that at least one fastening device for fastening at least one device-side cable is formed in the bottom part, that the contact body is located in the top part and has a first contact device and a second contact device, and that, in the joined position of the bottom part to the top part, the contact body makes contact with the device-side cable with the first contact device and makes contact with the connection-side cable with the second contact device.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: August 7, 2007
    Assignee: Phoenix Contact GmbH & Co. KG
    Inventor: Heinz Reibke
  • Patent number: 7094707
    Abstract: A method of nitriding a gate oxide layer by annealing a preformed oxide layer with nitric oxide (NO) gas in a hot wall, single wafer furnace is provided. The nitridation process can be carried out rapidly (i.e., at nitridation times of 30 seconds to 2 minutes) while providing acceptable levels of nitridation (i.e., up to 6 at. %) and desirable nitrogen/depth profiles. The nitrided gate oxide layer can optionally be reoxidized in a second oxidation step after the nitridation step. A gate electrode layer (e.g., boron doped polysilicon) can then be deposited on top of the nitrided gate oxide layer or on top of the reoxidized and nitrided gate oxide layer.
    Type: Grant
    Filed: May 13, 2002
    Date of Patent: August 22, 2006
    Assignee: Cypress Semiconductor Corporation
    Inventors: Krishnaswamy Ramkumar, Sundar Narayanan
  • Patent number: 6924241
    Abstract: A method for producing an ultraviolet light (UV) transmissive silicon nitride layer in a plasma enhanced chemical vapor deposition (PECVD) reactor is presented. The UV transmissive film is produced by reducing, in comparison to a standard silicon nitride process, a flow rate of the silane and ammonia gas precursors to the PECVD reactor, and significantly increasing a flow rate of nitrogen gas to the reactor. The process reduces the concentration of Si—H bonds in the silicon nitride film to provide UV transmissivity. Further, the amount of nitrogen in the film is greater than in a standard PECVD silicon nitride film, and as a percentage constitutes a greater part of the film than silicon. The film has excellent step coverage and a low number of pinhole defects. The film may be used as a passivation layer in a UV erasable memory integrated circuit.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: August 2, 2005
    Assignee: ProMOS Technologies, Inc.
    Inventor: Tai-Peng Lee
  • Patent number: 6692313
    Abstract: A no-crimp electrical connector which does not require any metal pieces and is essentially comprised of two molded plastic body members. A molded plastic first body member has a connection chamber and a threaded wall bounds the connection chamber. A second molded plastic second body member has an externally threaded surface threadably engageable with the threaded wall in the first body member. One of the body members has an integral central conically shaped element which has an axis coaxial with the body member in which it is formed. The second body member has a throughbore with the throughbore having first and seconds ends. The first throughbore end is shaped to accommodate two or more wires in parallel, side-by-side relation. Preferably, the shape is oval or ablong.
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: February 17, 2004
    Assignee: Swenco Products, Inc.
    Inventor: René Tomasino
  • Patent number: 6554655
    Abstract: An electrical power connection block housing including a first housing piece and a second housing piece. The first housing piece forms at least a portion of a first exterior side of the block housing. An interior side of the first housing piece has a first slot shaped bus bar mounting area. The second housing piece is connected to the first housing piece. The second housing piece has a portion with a first side located directly opposite the interior side of the first housing piece and a second slot shaped bus bar mounting area on the first side of the second housing piece. The first and second housing pieces form a first bus bar receiving area with the first and second bus bar mounting areas located generally opposite each other on opposite sides of the receiving area for capturing a bus bar therebetween.
    Type: Grant
    Filed: October 16, 2001
    Date of Patent: April 29, 2003
    Assignee: FCI Americas Technology, Inc.
    Inventor: Richard Chadbourne
  • Publication number: 20030049973
    Abstract: This system is applicable to the connection and assembly between electric or electronic modules or devices (1 and 2) which are fitted with input and output connectors installed in corresponding bases which are supplemented with protective covers installed on the connector input and output sections proper. The novelty consists of the input connector sections (5) of the module (2) including, reproduced and integrated, the base (7) and cover (8) of the output connector section (4) of the module (1), as a result of which these bases (7) and cover (8) of the module (1) can be changed over to the output connector sections (6) of the module (2), it therefore being possible for this module to be supplied without said base and cover.
    Type: Application
    Filed: September 5, 2002
    Publication date: March 13, 2003
    Inventors: Marti Palet Mercader, Miguel Ortiz Gimenez
  • Patent number: 6494753
    Abstract: A no-crimp electrical connector is essentially comprised of two molded plastic body members. A molded plastic body member has a connection chamber and a threaded wall bounds the connection chamber. A second molded body member has an externally threaded surface threadably engageable with the threaded wall in the first body member. One of the body members has a central conically shaped conductive element, and the other has a throughbore with the throughbore having one end shaped to accommodate two or more wires in side-by-side relation. A second end has complementary conical walls so that the wire ends of the two or more wires are clamped together between the conductive conical shaped element and the conical surface. Slots are provided in one or both body members and form spring fingers to allow pressing and/or relative rotation between the body members.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: December 17, 2002
    Assignee: Swenco Products, Inc.
    Inventor: René Tomasino
  • Patent number: 6358103
    Abstract: A no-crimp electrical connector which does not require any metal pieces and is essentially comprised of two molded plastic body members. A molded plastic first body member has a connection chamber and a threaded wall bounds the connection chamber. A second molded plastic second body member has an externally threaded surface threadably engageable with the threaded wall in the first body member. One of the body members has an integral central conically shaped element which has an axis coaxial with the body member in which it is formed. The second body member has a throughbore with the throughbore having first and second ends. The first throughbore end is shaped to accommodate two or more wires in parallel, side-by-side relation. Preferably, the shape is oval or oblong.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: March 19, 2002
    Assignee: Swenco Products, Inc.
    Inventor: René Tomasino
  • Patent number: 6099344
    Abstract: An electrical connector comprising a housing part, a cap part, and a clamp screw. The housing part has a conductor receiving channel formed therein. The cap part is removably connected to the housing part. The clamp screw is threadably mounted to the cap part to clamp a first conduct or located in the conductor receiving channel of the housing part to the housing. The clamp screw has means for connecting a second conductor to an insulated portion of the first conductor. The connecting means comprise the clamp screw having a contact surface disposed to capture a terminal of the second conductor between the contact surface and the first conductor.
    Type: Grant
    Filed: May 11, 1999
    Date of Patent: August 8, 2000
    Assignee: Framatome Connectors USA, Inc.
    Inventor: Richard Chadbourne
  • Patent number: 5664971
    Abstract: Disclosed is a terminal binding post for selectively mounting a wire, a fork connector and a banana plug which includes: an electrically insulated housing; an electrically conducting contact member received within a cavity of the housing; and a clamping member having an exterior clamping surface and an interior clamping surface defined in a clamping slot for receiving a tab of the contact member. The clamping member and contact member define separate wire receiving and fork connector receiving spaces. An aperture and a slot are defined in the housing which are sized and dimensioned for respectively receiving a wire and a fork connector. The clamping member is moveable in the cavity with respect to the contact member between a wire engaged position in which the clamping member securely engages the wire to the first tab of the contact and a wire disengaged spaced therefrom.
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: September 9, 1997
    Inventor: John W. Coy
  • Patent number: 5532613
    Abstract: The present invention relates to a probe needle wherein a conductive film is formed over a first insulating film formed around the outer periphery of a rod-like member through which a signal current flows, a second insulating film is formed over the outer periphery of the conductive film, and the conductive film is grounded. Since the rod-like member through which a signal current flows is thereby shielded, it is not affected by noise, and mutual crosstalk between signal currents is also prevented. Moreover, since ill effects caused by mutual contact with other probe needles is prevented by the second insulating film, reliable and stable measurement is possible.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: July 2, 1996
    Assignees: Tokyo Electron Kabushiki Kaisha, Tokyo Electron Yamanashi Kabushiki Kaisha
    Inventors: Yasushi Nagasawa, Satoru Yamashita, Masahiko Matsudo
  • Patent number: 5320565
    Abstract: Improvements and modifications to an electrical grid interconnector initially adapted for electrically and mechanically interconnecting conductors in parallel which improvements and modifications permit the electrical connector to additionally connect the two conductors in perpendicular relationship. The connector includes a C-shaped clamp body member which has a lower surface, a flat back surface and a downwardly curved upper surface. A wedge member, moved by screw means relative to the body member, works against the lower surface of the C-shaped clamp member. A slot is provided in the clamp body member extending from the lower surface thereof upwardly through the rear wall and curved top wall thereof. Alternate conductor interface inserts are provided which are positioned between the two conductors to be interconnected.
    Type: Grant
    Filed: March 23, 1993
    Date of Patent: June 14, 1994
    Assignee: Nicholas B. Polidori
    Inventor: Mario D. Polidori
  • Patent number: 5203716
    Abstract: A terminal block for receiving and terminating one or more conductors. The block comprises a housing of insulating material and screw-operated insulation displacement terminals (3) which are arranged in cavities (22) of the housing. Each terminal (3) includes a first contact member (4) which has an upper portion (5) containing a transverse opening (18) to accommodate one or more conductors. Furthermore, the first contact member (4) has a lower portion forming a downwardly extending pin (6) which extends through a base portion (14) of the housing and can be inserted into a plated-through hole of a printed circuit board. The terminal also includes a second contact member (7) forming a cage (8) which has on its top a threaded bore (11) for a screw (10).
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: April 20, 1993
    Assignee: Molex Incorporated
    Inventors: Roberto Martucci, Mario Previato
  • Patent number: 5152701
    Abstract: A connecting device for electrically and mechanically joining two conductors positioned substantially perpendicular having improvements allowing for easier and safer installation. The connector includes a C-shaped body member and a wedge assembly. The C-shaped body member has two spaced apart fingers hooked to engage one conductor and a yoke section which joins the fingers and is contoured to engage another conductor. The wedge assembly provides the separating and securing means to the conductors and is comprised of two parts. The wedge assembly is comprised of a wedge shaped section and a T-shaped section that are mechanically engaged by use of interacting parts involving the incline of the wedge and the vertical portion of the "T". Each member of the wedge assembly has an independent contoured surface which engages one of the transversing conductors. The wedge assembly functions separately from and unconnected to the body member when installed between the conductors.
    Type: Grant
    Filed: July 24, 1991
    Date of Patent: October 6, 1992
    Inventor: Mario Polidori
  • Patent number: 5004437
    Abstract: An electrical connector block is provided having a housing with a pair of generally parallel sidewalls extending from a base member and separated by a trough open on the side opposite the base member, a groove on each sidewall opposite the trough and spaced from the open side of the trough, a cap member having depending arms adapted to slide along the sides of the parallel sidewalls over the open trough, said arms having inturned flanges engaged in the grooves of the sidewall, at least one screw member threadingly engaged in said cap member and carrying a clamp member pivoted on the end thereof between the sidewalls for clamping a wire between the clamp member and base member.
    Type: Grant
    Filed: March 20, 1987
    Date of Patent: April 2, 1991
    Assignee: Walter Electrical Manufacturing Company
    Inventors: Gerard S. Walter, John Hagan
  • Patent number: 5000705
    Abstract: An electrical cable connection device (10) for use in splicing a pair of cables or teminating a single cable has been disclosed. More particularly, the device (10) includes a body member (12), wedge (14) and bolt (16). An axial passage (22) through the body member for receiving the end of the cable is intersected by a transverse passage (42) in which the wedge (14) is slidably positioned. The wedge (14) is drawn into tight engagement with the cable by the bolt (16) entering the transverse passage (42) on an opposite side of the axial passage (22).
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: March 19, 1991
    Assignee: AMP Incorporated
    Inventors: Andrew J. Kinka, Walter M. Werner
  • Patent number: 4911572
    Abstract: A tie back clamp is provided for retaining a severed end of a power cable in a safe, removed position when it is necessary to cut the cable to perform service or otherwise work on the power line. The clamp retains a tail or end portion adjacent the location of the cut at a position transverse the remaining cable from which the stub or end portion extends.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: March 27, 1990
    Assignee: Houston Industries Incorporated
    Inventor: Danny R. Williams
  • Patent number: 4850359
    Abstract: A brain-contact device (19,12,13) having a multi-electrode tissue-engagement member (14,16), lead wires (32) extending to a terminal mount (36) with an array of lead-wire terminals (38) on it, and a connector (46,46a) including a base (48,48a) with a matching array of take-up terminals (70,70a), a movable yoke (50,50a) forming with the base a terminal-mount space (62,62a), and a device (52,52a) to hold the yoke and base together with the arrays in contact.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: July 25, 1989
    Assignee: Ad-Tech Medical Instrument Corporation
    Inventor: David A. Putz
  • Patent number: 4795365
    Abstract: A splice device for in-line splicing of two cables, wires or the like. More particularly, the device includes a body member having axial extending apertures in each end face and transversely extending passages intersecting the apertures. Wedge members, having threaded ends, are positioned in the transverse passages with the threaded ends extending out of the body member of receiving nuts so that the wedge members can be drawn tightly in the passages and thereby securely wedging cables positioned in the apertures.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: January 3, 1989
    Assignee: AMP Incorporated
    Inventors: Gordon R. Johnston, Walter M. Werner
  • Patent number: 4687273
    Abstract: A connector comprises a sleeve and a rod, the threaded interfacing surface of one of the parts being provided with a longitudinal recess for the input of conductors. The recess has a concave surface facing the longitudinal axis of the connector and the depth thereof increases in the direction where the two parts are joined.
    Type: Grant
    Filed: April 26, 1985
    Date of Patent: August 18, 1987
    Assignee: Latviisky Gosudarstvenny Universitet Imeni Petra Stuchki
    Inventor: Anatoly S. Pranch