WO1991004461A1 - Integrated data transmission computer and system - Google Patents

Integrated data transmission computer and system Download PDF

Info

Publication number
WO1991004461A1
WO1991004461A1 PCT/US1989/004057 US8904057W WO9104461A1 WO 1991004461 A1 WO1991004461 A1 WO 1991004461A1 US 8904057 W US8904057 W US 8904057W WO 9104461 A1 WO9104461 A1 WO 9104461A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
cellular telephone
housing
computer
arranged
antenna
Prior art date
Application number
PCT/US1989/004057
Other languages
French (fr)
Inventor
Walker C. Morris
Original Assignee
Intelligence Technology Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2258Supports; Mounting means by structural association with other equipment or articles used with computer equipment
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 – G06F13/00 and G06F21/00
    • G06F1/16Constructional details or arrangements
    • G06F1/1613Constructional details or arrangements for portable computers
    • G06F1/1615Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function
    • G06F1/1616Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38Information transfer, e.g. on bus
    • G06F13/382Information transfer, e.g. on bus using universal interface adapter
    • G06F13/385Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers; Analogous equipment at exchanges
    • H04M1/72Substation extension arrangements; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selecting
    • H04M1/725Cordless telephones

Abstract

A computer (10) is disclosed having first and second housing compartments (12 and 14) connected by a hinge (16) for pivoting between relative open and closed positions, a display screen (18) in one of the housing compartments and a manual keyboard (20) arranged within the other. A cellular telephone is arranged within one of the housing compartments along with a modem and an extendable antenna (36) is located in the housing department with the display screen. In one arrangement a microphone and a speaker (50) are arranged within the housing and operably connected to the cellular telephone. A data network includes at least one such computer which communicates with the rest of the network by means of the cellular telephone.

Description

Description

Integrated Data Transmission Computer and System

Technical Field

The present invention related to data transmission systems, and, in particular, to an integrated computer and cellular telephone for data transmission.

Background Art

Portable computers such as lap-top computers are well established. Similarly, data networks such as those know as local area networks (LAN) are also well known. It is also well know to control radiotelephone transceivers by microprocessors as is disclosed in United States Patent No. 4,486,624 of Puhl et al.

There have been numerous attempts in the past to combine general purpose computers, normally portable or lap-top computers with various degrees of telephone trans¬ mission capability. It is certainly common and well established to have built-in modem to modulate and demodu¬ late signals between the computer and a telephone. U. S. Patent No. 4,533,791 issued to Read et al shows a computer with a built-in conventional telephone. U. S. Patent NO. 4,577,068 of Kelly et al shows a telephone cradle which can be used with a computer or "communication terminal." U. S. Patent No. 4,571,456 of Paulsen et al shows a lap-top computer adapted to incorporate an acoustic coupler or telephone handset. A portable "information display" which incorporates what appears to be a standard modem is shown in U. S. Patent NO. 4,496,943 of Greenblatt. U. S. Patent No. 4,602,127 of Neely et al discloses a vehicle computer which makes use of a communication's controller. A com¬ puter equipped with an infrared or other line of sight transmitter is shown in U. S. Patent No. 4,456,793 of Baker et al. The actual physical mechanism shown is not too specific but does not appear to be incorporated into the computer frame itself.

Disclosure of the Invention

A computer, according to the present invention, includes an information display such an LCD screen, a keyboard for manual input of information into the computer, a cellular telephone incorporated within the computer, a modem for modulating/demodulating signals fed to and from the cellular telephone, and an antenna for transmitt- ing/receiving signals from the cellular telephone. In preferred from, radiation shielding substantially blocks direct radiation from the antenna to the rest of the computer. It is preferred that some radiation shielding also substantially block radiation from the cellular telephone to the rest of the computer. In one form, a microphone and a speaker are operably connected o the cellular telephone for transmitting/receiving voice sig¬ nals.

A portable form of a computer, according to the present invention, includes a housing having first and second compartments connected by a hinge for pivoting the compartments to relative open and closed positions. A preferred form has the antenna arranged within the same housing as the information display. The antenna is exten- dable from that housing compartment when in use.

A data network, according to the present invention, includes a plurality of computers, at least one of which comprises a housing, a cellular telephone arranged within the housing, a modem with the housing for modulat- ing/demodulating signals fed to and from the cellular telephone, and some means for transmitting/receiving signals to and from the cellular telephone. At least one computer communicates with the other computers of the plurality by means of the cellular telephone. These and other objects, and advantages and features of this invention will be apparent from the following description taken with reference to the accompanying drawing, wherein is shown the preferred embodiments of the invention.

Brief Description of Drawing

FIGURE 1 is a front right perspective view of a portable computer according to the present invention in a relative open position; FIGURE 2 is a right side elevational view of the portable computer of FIGURE 1;

FIGURE 3 is a bottom plan view of the portable com¬ puter of FIGURE 1 with the bottom panel removed;

FIGURE 4 is a diagrammatic representation of a data network according to the present invention;

FIGURE 5 is a diagrammatic view of an alternative embodiment of a data network according to the present invention; and

FIGURE 6 is a diagrammatic representation of a data network according to the present invention being used for the transmission of voice signals.

Best Mode for Carrying Out the Invention

Referring now to the drawing, and in particular to FIGURE 1, a portable computer according to the present invention is referred to generally by reference numeral 10. Portable computer 10 includes a housing having first and second compartments 12 and 14 connected by hinge means 16 for pivoting the compartments to relative open and closed positions as is well known in the art. means such as detachable liquid crystal display screen 18 displays information from the computer when the compartments are in the open position, and a manual keyboard 20 allows for the input of information into the computer.

Referring also to FIGURE 2 and FIGURE 3, a cellular telephone forms an integral part of computer 10 and in- eludes transceiver 22, cellular telephone batteries 24, and a cellular power board 26. A modem 28 is arranged within the housing, in this case second housing compartment 14 for modulating/demodulating signals sent to and from cellular telephone transceiver 22. In a preferred from, cellular transceiver 22 is encased within its own housing which shields the rest of the computer from radiation. In one form, this is simply a matter of coating its own housing with aluminum oxide. Battery pack 30 and voltage converter 32 provide power for the remaining computer operations. In this case, they are located within second housing compart¬ ment 14 as are computer cards 34.

Portable computer 10 also includes means such as antenna 36 and transmitting/receiving signals from cellular telephone transceiver 22. In a preferred from, antenna 36 is arranged within and extendable from first housing compartment 12 in a conventional telescoping antenna arrangement. Radiation shielding 38 forms a cylinder around that portion of antenna 36 within first housing compartment 12. A currently suitable form of radiation shielding is rubberized aluminum, but a layer of aluminum oxide over housing of transceiver 22, adequate shielding of other vital computer elements from transceiver and antenna radiation must be balanced against maintaining a light portable weight for the overall computer.

IN a preferred from, the attitude of first housing compartment 12 and, hence detachable LCD screen 19 is adjustable for personal preference and lighting between the position shown and continuous positions back to that indicated by reference numeral 40.

In one arrangement, portable computer 10 also includes such features as a built-in hard disk 42, a pop-up floppy disk drive 44, a modular jack 36 for a telephone handset to be connected to cellular transceiver 22, and an audio signal jack 48 for a headset. In a preferred form, com¬ puter 10 also includes a microphone and a speaker such as pop-up speaker phone 50 operably connected to cellular telephone transceiver 22 for transmitting/receiving voice signals. Finally, a retractable handle 52 adds to easy portability. In one arrangement of keyboard 20, a numeric touch pad 21 also serves as a touch tone telephone pad for the cellular telephone.

Referring now to FIGURE 4, a data network according to the present invention is referred to generally by reference numeral 54. Data network 54 includes a plurality of computers 56, at least one of which is similar to portable computer 10, having a housing, in this case comprising first housing compartment 12 and second housing compartment 14, a cellular telephone arranged within the housing as previously described, a modem arranged within the housing as previously described for modulating/demodulating signals fed to and from the cellular telephone, and means such as antenna 36 for transmitting/receiving signals from the cellular telephone. In the particular embodiment il¬ lustrated, all of the computers communicate by means of cellular telephones through a cellular phone station 50 which forms a part of the communications link used by the data network.

Referring also to FIGURE 5, an alternative embodiment of a data network according to the present invention is referred to generally by reference numeral 60 in which cellular phone station 58 and its telephone exchange station 62 from part of the communications link used by he data network. In the embodiment illustrated, however, in addition to the plurality 56 of computers 10 there a larger plurality of computers, some of which make up afcconvention- al local area network 64 and another of which functions as a host computer 66. Host computer 66 and local area network 64 communicate through telephone exchange station 62 by means of modems 68 and 70 respectively.

Referring now to FIGURE 6, data network 68 which could, in reality, be either data network 54 or data network 60 previously illustrated can also provide voice communications for field units using portable computer 10 communicating with other similar field units using portable computer 10 communicating with other similar field units within plurality of computers 56 or a mobile telephone 70 or a conventional house telephone 72.

From the foregoing it will be seen that this invention is one well adapted to attain all the end and objects hereinabove set forth, together with other advantages which are obvious and which are inherent to the apparatus.

It will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is in the scope of the claims.

As many possible embodiments may e made of the inven- tion without departing from the scope thereof, it is to be understood that all matter herein set froth or shown in the figures of the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

Claims

1. A portable computer comprising in combination: a housing having first and second compart¬ ments connected by hinge means for pivoting the compartments to relative open and closed posi¬ tions; means at least partially located within the first housing compartment for displaying in formation when the compartments are in the open position; a manual keyboard arranged within the second housing compartment; a cellular telephone arranged within one of the housing compartments; a modem arranged within one of the housing compartments for modulating/demodulating signals fed to and from the cellular telephone; and an antenna arranged within the first housing compartment for transmitting/receiving signals from the cellular telephone.
2. A portable computer according to Claim 1 wherein the antenna is extendable from the first housing compartment, the computer further comprising radiation shielding substantially surrounding that portion of the antenna which remains within the housing.
3. A portable computer according to Claim 2 further comprising a microphone and a speaker arranged at least partially within the housing and operably connected to the cellular telephone for trans¬ mitting/receiving voice signals.
4. A portable computer according to claim 1 further comprising a microphone and a speaker arranged at least partially within the housing and operably connected to the cellular telephone for trans- mitting/receiving voice signals.
5. A data network comprising a plurality of com¬ puters, at least one of the computers within the network including in combination; a housing; a cellular telephone arranged within the housing; a modem arranged within the housing for modulating/demodulating signals fed to and from the cellular telephone; and means for transmitting/receiving signals from the cellular telephone; wherein the at least one computer communicates with the other com¬ puters of the plurality through the cellular telephone.
6. A data network according to Claim 5 wherein the means for transmitting/receiving comprises an antenna arranged within and extendable from the housing.
7. A computer comprising in combination: means for displaying information; a keyboard for manual input of information into the computer; a cellular telephone; a modem for modulating/demodulating signals fed to and from the cellular telephone; and an antenna for transmitting/receiving signals from the cellular telephone.
8. A computer according to Claim 7 further compris¬ ing radiation shielding substantially blocking direct radiation from the antenna to the rest of the computer.
9. A computer according to Claim 8 further compris¬ ing microphone and a speaker operably connected to the cellular telephone for transmitt¬ ing/receiving voice signals.
10. A computer according to Claim 7 further compris- ing a microphone and a speaker operably connected to the cellular telephone for transmitt¬ ing/receiving voice signals.
PCT/US1989/004057 1989-09-21 1989-09-21 Integrated data transmission computer and system WO1991004461A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1989/004057 WO1991004461A1 (en) 1989-09-21 1989-09-21 Integrated data transmission computer and system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP51065789A JPH04503436A (en) 1989-09-21 1989-09-21
PCT/US1989/004057 WO1991004461A1 (en) 1989-09-21 1989-09-21 Integrated data transmission computer and system
EP19890911420 EP0444052A4 (en) 1989-09-21 1989-09-21 Integrated data transmission computer and system
KR910070517A KR0185726B1 (en) 1989-09-21 1989-09-29 Integrated data transmission computer and system

Publications (1)

Publication Number Publication Date
WO1991004461A1 true true WO1991004461A1 (en) 1991-04-04

Family

ID=22215238

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/004057 WO1991004461A1 (en) 1989-09-21 1989-09-21 Integrated data transmission computer and system

Country Status (4)

Country Link
EP (1) EP0444052A4 (en)
JP (1) JPH04503436A (en)
KR (1) KR0185726B1 (en)
WO (1) WO1991004461A1 (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526688A2 (en) * 1991-08-05 1993-02-10 Robert Bosch Gmbh Coupling device for transmitting data and/or control signals between a radiotelephone station and a computer
US5212628A (en) * 1992-01-17 1993-05-18 The I.D.E.A. Corporation Modular portable work station having a movable support tray
EP0571124A1 (en) * 1992-05-21 1993-11-24 International Business Machines Corporation Mobile data terminal
WO1994012938A1 (en) * 1992-12-02 1994-06-09 Compaq Computer Corporation Handheld computer with automatic data synchronization with host computer
EP0649082A1 (en) * 1993-10-18 1995-04-19 Harald Nickol Pocket calculator data transmission apparatus
WO1995012223A1 (en) * 1993-10-28 1995-05-04 Galtronics (U.K.) Limited Antenna system
ES2070048A2 (en) * 1992-11-13 1995-05-16 Iberdrola I S A Mobile radio data communication terminal
US5422656A (en) * 1993-11-01 1995-06-06 International Business Machines Corp. Personal communicator having improved contrast control for a liquid crystal, touch sensitive display
EP0656600A2 (en) * 1993-11-09 1995-06-07 Fujitsu Limited An information processing system using portable terminal unit and data communication adapter therefor
US5446789A (en) * 1993-11-10 1995-08-29 International Business Machines Corporation Electronic device having antenna for receiving soundwaves
WO1995034958A1 (en) * 1994-06-16 1995-12-21 Apple Computer, Inc. A pc card cellular-based communication system
WO1996006486A1 (en) * 1994-08-18 1996-02-29 Sc & T International, Inc. Multimedia computer keyboard
DE29601873U1 (en) * 1996-01-23 1996-07-04 Lindemann Ulrich Combination of computer and wireless communication device
US5594470A (en) * 1992-10-02 1997-01-14 Teletransaction, Inc. Highly integrated portable electronic work slate unit
US5627450A (en) * 1994-01-28 1997-05-06 Compaq Computer Corporation Tiltable docking base with a battery charger
US5644320A (en) * 1994-06-30 1997-07-01 Compaq Computer Corporation Antenna system for a notebook computer
US5668570A (en) * 1993-06-29 1997-09-16 Ditzik; Richard J. Desktop computer with adjustable flat panel screen
EP0791878A3 (en) * 1996-02-20 1998-04-01 International Business Machines Corporation A laptop computer with an integrated multi-mode antenna
US5825617A (en) * 1992-10-02 1998-10-20 Teletransactions, Inc. Workslate computer having modular device docking stations on horizontal and vertical side portions
US5854737A (en) * 1993-11-09 1998-12-29 Fujitsu Limited Information processing system using portable terminal unit and data communication adapter having biased connector
EP0936562A1 (en) * 1998-02-16 1999-08-18 Sennheiser electronic GmbH & Co. KG Method and data processing system for communicating between at least one other data processing system
US5956017A (en) * 1991-03-25 1999-09-21 Seiko Epson Corporation Electronic information apparatus
EP0695072A3 (en) * 1994-07-25 1999-11-03 International Business Machines Corporation Method and apparatus for consistent user interface in a multiple application personal communications device
EP1109250A1 (en) * 1999-12-08 2001-06-20 Kabushiki Kaisha Toshiba Radio communication device and electronic apparatus having the same
US6266045B1 (en) 1994-06-30 2001-07-24 Telxon Corporation Interactive display user interface computer and method
WO2001079973A2 (en) * 2000-04-18 2001-10-25 Koninklijke Philips Electronics N.V. Mobile internet
GB2366914A (en) * 2000-09-13 2002-03-20 Inventec Corp Antenna apparatus for portable electronic device

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Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6400351B1 (en) * 1991-03-25 2002-06-04 Seiko Epson Corporation Electronic information apparatus
US5956017A (en) * 1991-03-25 1999-09-21 Seiko Epson Corporation Electronic information apparatus
EP0526688A3 (en) * 1991-08-05 1993-11-03 Bosch Gmbh Robert Coupling device for transmitting data and/or control signals between a radiotelephone station and a computer
EP0526688A2 (en) * 1991-08-05 1993-02-10 Robert Bosch Gmbh Coupling device for transmitting data and/or control signals between a radiotelephone station and a computer
US5212628A (en) * 1992-01-17 1993-05-18 The I.D.E.A. Corporation Modular portable work station having a movable support tray
WO1993014617A1 (en) * 1992-01-17 1993-07-22 The I.D.E.A. Corporation Modular portable computer work station
EP0571124A1 (en) * 1992-05-21 1993-11-24 International Business Machines Corporation Mobile data terminal
US5825617A (en) * 1992-10-02 1998-10-20 Teletransactions, Inc. Workslate computer having modular device docking stations on horizontal and vertical side portions
US5594470A (en) * 1992-10-02 1997-01-14 Teletransaction, Inc. Highly integrated portable electronic work slate unit
US6215475B1 (en) 1992-10-02 2001-04-10 Telxon Corporation Highly integrated portable electronic work slate unit
ES2070048A2 (en) * 1992-11-13 1995-05-16 Iberdrola I S A Mobile radio data communication terminal
US6317797B2 (en) 1992-12-02 2001-11-13 Compaq Computer Corporation System for automatic synchronization of common file between portable computer and host computer via communication channel established with user approval of charge to be incurred
US5928329A (en) * 1992-12-02 1999-07-27 Compaq Computer Corporation System for automatic synchronization of common file between portable computer and host computer via communication channel selected from a plurality of usable channels therebetween
US5666530A (en) * 1992-12-02 1997-09-09 Compaq Computer Corporation System for automatic synchronization of common file between portable computer and host computer via communication channel selected from a plurality of usable channels there between
WO1994012938A1 (en) * 1992-12-02 1994-06-09 Compaq Computer Corporation Handheld computer with automatic data synchronization with host computer
US5668570A (en) * 1993-06-29 1997-09-16 Ditzik; Richard J. Desktop computer with adjustable flat panel screen
EP0649082A1 (en) * 1993-10-18 1995-04-19 Harald Nickol Pocket calculator data transmission apparatus
WO1995012223A1 (en) * 1993-10-28 1995-05-04 Galtronics (U.K.) Limited Antenna system
US5422656A (en) * 1993-11-01 1995-06-06 International Business Machines Corp. Personal communicator having improved contrast control for a liquid crystal, touch sensitive display
EP0656600A2 (en) * 1993-11-09 1995-06-07 Fujitsu Limited An information processing system using portable terminal unit and data communication adapter therefor
US5854737A (en) * 1993-11-09 1998-12-29 Fujitsu Limited Information processing system using portable terminal unit and data communication adapter having biased connector
EP0656600A3 (en) * 1993-11-09 1998-04-01 Fujitsu Limited An information processing system using portable terminal unit and data communication adapter therefor
US5960208A (en) * 1993-11-09 1999-09-28 Fujitsu Limited Data communication adapter for selectively supplying power to a communication control circuit or a portable terminal unit
US6163268A (en) * 1993-11-09 2000-12-19 Fujitsu Limited Information processing system using portable terminal unit and data communication adapter therefor
US5446789A (en) * 1993-11-10 1995-08-29 International Business Machines Corporation Electronic device having antenna for receiving soundwaves
US5627450A (en) * 1994-01-28 1997-05-06 Compaq Computer Corporation Tiltable docking base with a battery charger
WO1995034958A1 (en) * 1994-06-16 1995-12-21 Apple Computer, Inc. A pc card cellular-based communication system
US6266045B1 (en) 1994-06-30 2001-07-24 Telxon Corporation Interactive display user interface computer and method
US6388659B2 (en) 1994-06-30 2002-05-14 Telxon Corporation Interactive display user interface computer and method
US5644320A (en) * 1994-06-30 1997-07-01 Compaq Computer Corporation Antenna system for a notebook computer
EP0695072A3 (en) * 1994-07-25 1999-11-03 International Business Machines Corporation Method and apparatus for consistent user interface in a multiple application personal communications device
WO1996006486A1 (en) * 1994-08-18 1996-02-29 Sc & T International, Inc. Multimedia computer keyboard
US5717430A (en) * 1994-08-18 1998-02-10 Sc&T International, Inc. Multimedia computer keyboard
DE29601873U1 (en) * 1996-01-23 1996-07-04 Lindemann Ulrich Combination of computer and wireless communication device
EP0791878A3 (en) * 1996-02-20 1998-04-01 International Business Machines Corporation A laptop computer with an integrated multi-mode antenna
EP0936562A1 (en) * 1998-02-16 1999-08-18 Sennheiser electronic GmbH & Co. KG Method and data processing system for communicating between at least one other data processing system
US6631396B2 (en) 1998-02-16 2003-10-07 Sennheiser Electronic Gmbh & Co. Kg Process and electronic data-processing system for communication with at least one other electronic data-processing system
EP1109250A1 (en) * 1999-12-08 2001-06-20 Kabushiki Kaisha Toshiba Radio communication device and electronic apparatus having the same
US6728559B2 (en) 1999-12-08 2004-04-27 Kabushiki Kaisha Toshiba Radio communication device and electronic apparatus having the same
WO2001079973A3 (en) * 2000-04-18 2002-02-07 Koninkl Philips Electronics Nv Mobile internet
WO2001079973A2 (en) * 2000-04-18 2001-10-25 Koninklijke Philips Electronics N.V. Mobile internet
GB2366915A (en) * 2000-09-13 2002-03-20 Inventec Corp Antenna apparatus for portable electronic device
GB2366915B (en) * 2000-09-13 2002-07-31 Inventec Corp Antenna apparatus for portable electronic device
GB2366914B (en) * 2000-09-13 2002-07-31 Inventec Corp Antenna apparatus for portable electronic device
GB2366914A (en) * 2000-09-13 2002-03-20 Inventec Corp Antenna apparatus for portable electronic device

Also Published As

Publication number Publication date Type
EP0444052A1 (en) 1991-09-04 application
JPH04503436A (en) 1992-06-18 application
EP0444052A4 (en) 1992-09-09 application
KR0185726B1 (en) 1999-05-15 grant

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