CA2075279A1 - Radio communication system - Google Patents
Radio communication systemInfo
- Publication number
- CA2075279A1 CA2075279A1 CA002075279A CA2075279A CA2075279A1 CA 2075279 A1 CA2075279 A1 CA 2075279A1 CA 002075279 A CA002075279 A CA 002075279A CA 2075279 A CA2075279 A CA 2075279A CA 2075279 A1 CA2075279 A1 CA 2075279A1
- Authority
- CA
- Canada
- Prior art keywords
- telephone
- call
- information
- base station
- available
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/12—Inter-network notification
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/022—One-way selective calling networks, e.g. wide area paging
Abstract
This radio communication system (10) includes a plurality of remote base stations or callpoints (12). When an incoming call is to be directed to a cordless telephone (11), the identifying information for the cordless telephone (11), along with a call back number or ID is transmitted as by a paging signal (20) by a PABX
(14). Each of the base stations (12) includes a paging receiver for receiving the information. If the base station (12) has a line available it initiates a call to the cordless telephone. A base station (12) that locates the cordless telephone (11) would provide the connection for the call. By calling the PABX (14) utilizing the call back ID, the base station (12) can complete the call.
(14). Each of the base stations (12) includes a paging receiver for receiving the information. If the base station (12) has a line available it initiates a call to the cordless telephone. A base station (12) that locates the cordless telephone (11) would provide the connection for the call. By calling the PABX (14) utilizing the call back ID, the base station (12) can complete the call.
Description
W O 91/13509 PCr/US91/00136 2 ~ 7 5 2 7 9 '~leth(~ And System For Establishing Link with Wireless Telephone"
BAC~KGR~UND Qf ~he INVENTlt~N
This invention relates to radio communication systems in general and particularly to a system tor interconnecting telephone calls to portable radio devices. The second generation cordless talephone system or CT-2 system that has been proposed envisions utilization of a plurality of RF ehannels for radio cornmunication. The proposed system would include forty channels for providing the RF links between the cordless tel0phones or CT-2 handsets and the base system which is connected to the~existing telephone nstwork. In operation, when the user is at his home base, telephone calls would be 1 5 transmitted via the home base to the cordless telephone. When away from the home base, the cordless telephone unit can be used to originate telephone calls when the user is within ranga of a a telepoint or callpoint. To originate a call, the cordless telephone would scan the 40 channels to find an available 2 0 channel and then attempt to access the telepoint. The telepoint, likewise, would be scanning the f~rty available channels for incoming radio calls and when it receivcd a call request from a cordless telephone would provide the ~el~phone interconnection.
Such a system, providss for the placement of calls from the 2 5 cordless telephone while away from home base. However, it is not readily adaptable to the reception of phone calls. There have been proposals to include a wide araa paging receiver within the cordless telephone in order to receive messages such as the fact that a call has been made to the cordless telephone number.
BAC~KGR~UND Qf ~he INVENTlt~N
This invention relates to radio communication systems in general and particularly to a system tor interconnecting telephone calls to portable radio devices. The second generation cordless talephone system or CT-2 system that has been proposed envisions utilization of a plurality of RF ehannels for radio cornmunication. The proposed system would include forty channels for providing the RF links between the cordless tel0phones or CT-2 handsets and the base system which is connected to the~existing telephone nstwork. In operation, when the user is at his home base, telephone calls would be 1 5 transmitted via the home base to the cordless telephone. When away from the home base, the cordless telephone unit can be used to originate telephone calls when the user is within ranga of a a telepoint or callpoint. To originate a call, the cordless telephone would scan the 40 channels to find an available 2 0 channel and then attempt to access the telepoint. The telepoint, likewise, would be scanning the f~rty available channels for incoming radio calls and when it receivcd a call request from a cordless telephone would provide the ~el~phone interconnection.
Such a system, providss for the placement of calls from the 2 5 cordless telephone while away from home base. However, it is not readily adaptable to the reception of phone calls. There have been proposals to include a wide araa paging receiver within the cordless telephone in order to receive messages such as the fact that a call has been made to the cordless telephone number.
3 0 Such an approach necessitatcs that the cordless telephone must be able to receive the page message, thereby compiicating the cordless telephone design.
In other radio telephone systerns, such as celiular radio, substantial infrastnJcture is required incluciing a control channel 3 5 for locating cellular phones in order to connect calls to a cellular phone. It would be desirabie to have a simple method of locatin~
.
WO 9ttl3509 P~/US91/00136 2~7~279 a cordless telephone in a system, such as the proposed CT-2 system.
SllL`~llM~RY of the INVENTiON
This radio communication sys~em includes a plurality of remote base stations or calipoints. When an insoming call is to be directed to a cordless t~lephone, the identifying information for the cordless telephone, along with a call back nurnber or ID is transmitted as by a paging signal. Each of the base stations, can 1 0 include a paging receiver for receiving the information . if the base station has a line available it would then initiating a call to the cordless telephone. A base station locating the cordless ~ ~~ ~ ~ telephone would provide the connection for the call E~Ri~F l:~ESCRIPTl~ Qf th~ ~RAWIN~
Fig. 1 is a block diagram of a radio communication system in accordance to the present invention.
Fig. 2 is a flow chart of the operation of the wireless PABX
of Fig. 1.
2 0 Fig. 3 is a flow chart of the opera~ion of a base station oF
Fig. 1.
DE~S~IPTIQ~_ o7 the ~R.E~ BRi~D ~MBQDIMI~NT
Referring now by characters of reference of the drawings 2 5 and first ~o Fig. 1, it will be understood that the radio communication system 10 is designed to interface cordless telephones to the Public Switched Telephone Network (PSTN).
While the preferred embodiment is illustrated in the context of a CT-2 system, other similar systems could be utili~ed. In this 3 0 system 10, a plurality of portable radio telephon~ devices, such as CT-2 handsets 11 can interface with the PSTN via any one of a plurality of CT-2 base stations 12. Each CT-2 handset 11 is desi~ned as a low power transceiver which, when at its home base, is designed for receiving and originating telephone calls.
3 5 When away from its home base, the handset 11 can originate calls if it is within range of a CT-2 base station 12. The present ., i WO 91/13509 PClr/US91/00136 2~7~279 invention provides means for attempling to loca~e a CT-2 handset 11 when it is at a location other than its home base station. In operation, it is envisioned that each CT-2 handset would have two address codes, or phone numbers corresponding to home 5 location and one for use when it is away from its home location.
When a telephone user d~sires to contact a CT-2 handset user who is away from his home base, a t~lephone number corresponding to the remote ID would be dialed to connect the phone user to the wireless PABX 14, which can be a CT-2 switch 1 0 or a central telephone office. Such a wireless PABX can be coupled to a network controller center 16 via a data link 18 for purposes of system billing, handset ID, and the like. When a cal - is received at the wireiess PABX-14 for a par~icular CT-2 handset 11, the wir~less PABX would originate a paging message, which 1 5 would include an ID for the called CT-2 handset as well as connection information for connecting ~he CT-2 handset with the incoming phone call at the PABX. This information would be transmitted, as via a wide area paging transmitter 20. Each of the CT-2 base stations 12 include a paging receiver for receivin~ the 2 0 pa~e transrnissions. Thc CT-2 base stations are also connected to the wireless PABX as by phone lines or trunks 22.
Each CT-2 base station 12 can include a plurality of transceivers, as for example 6 for the simultaneous connection of up to 6 CT-2 handsets to 6 phone lines. In a CT-2 systsm forty RF
2 5 channels are available ~or use by the handsets 11 and base station 12. If a CT-2 base station 12 has an available transceiver and phone line when the page is received, the base station would choose one of the available RF channels and transmit a call with th~ called CT-2 hands~ts ID. Such calls could go on essentially 3 0 simultaneously at the various CT-2 bas~ stations 12 but would not nece~sarily be made on the same frequency. Each of the CT-2 handsets 11, if not in use, woul~ have a rec~ive mode in which it would be scanning the forty RF channels for calls with its ID. In the event that a page has been made for a CT-2 handset which is 3 5 in range of a CT-2 base station 12, having an available transceiver/phone line, ~he call that is made over one of the six ~7~79 4 voice channels would be received by the CT-2 handset which would then automatically acknowledge a call. The CT-2 base station, on receipt of the acknowledgement, would respond by dialing the wireless PABX 14 using the communication phone 5 line ID received with ~he page and wou!d also ring a signal to similarly causing a ring on the ~::T-2 handsat to al~r~ the user to the incomin~ phone call.
The operation of the wireless PABX 14 is illus~rated in the flow chart of Fig. 2. Beginning with start block 30, the wireless 1 0 PABX ~4 monitors the incoming phone lines to see if a call requ~st has b~en received, decision block 32. If so, the address from the PSTN trunk line is identified, block 34, and the PABX
then connects to the paging transmitter 20, block 36 to transmit a numeric page which would include the handset nd phone line ID
1 5 information, block 38. The PABX then monitors for a response to the page, decision block 40. If no response is received, an indioation such as a digiti2ed message would be given to th~
caller that there has been no answer, block 42 and the routin0 would then end, block 44 returnin~ to start block 30. If a response 2 0 is received, the phon~ lines from the CT-2 base station 12 and the incoming phone call would bc connected together, block 42 and the wireless PABX would maintain th~ interconnection for the duration of the conversation, until a hang-up is detected, block 44.
At that point the routine would end, block 44 and return to start 2 5 block 30.
The operation of the base station 12 is illustrated in flow chart Fig. 3. The routine star~s at block 50 and examines whether a call request has been received as via the paging signal, decision block 52. If not, the routins continues to monitor for a call 3 0 re~u~st . When a call r0quest is received, the handset l :) is extracted from ths numeric data, block 54. The base station then determines if a transceiver/phone line is available, decision block 56. If not the routine returns to start and doas not attempt to locate the called handset 11. If a voice channel is available, a call 3 5 including the handset ID is transmitted an an available RF
channel, block 58. The channel is monitored, ~lock 60, for a - ~ : . ' . . :.
.
' ' :
WO 9t/13509 PCI/US91/00136 2~7~79 handset response. If no response is received the routine would end and return to start, decision block 62. If r~sponse is received, the base station would dial back to the PABX, block 64 utilizing the the number received in the page and the CT-2 base sta~ion 5 would provide the RF connection between th0 hal1dset and phone line, block 66 until the conversation is ended, block 68.
It will b~ appreciated that this system does not require the use of a control channel for communications between the base stations 12 and hands~ts 11. The lo~ting of a particular handset 1 0 11 is accomplished by utilizing one of the available CT-2 RF
channels. Consequently, the handset need only be monitoring these RF channels as by scanning. If a handset is within range of a base station that is not curr0ntly fully utilized, the handset can be located and connected to an incoming phone call.
1 5 We clairn as our invention:
In other radio telephone systerns, such as celiular radio, substantial infrastnJcture is required incluciing a control channel 3 5 for locating cellular phones in order to connect calls to a cellular phone. It would be desirabie to have a simple method of locatin~
.
WO 9ttl3509 P~/US91/00136 2~7~279 a cordless telephone in a system, such as the proposed CT-2 system.
SllL`~llM~RY of the INVENTiON
This radio communication sys~em includes a plurality of remote base stations or calipoints. When an insoming call is to be directed to a cordless t~lephone, the identifying information for the cordless telephone, along with a call back nurnber or ID is transmitted as by a paging signal. Each of the base stations, can 1 0 include a paging receiver for receiving the information . if the base station has a line available it would then initiating a call to the cordless telephone. A base station locating the cordless ~ ~~ ~ ~ telephone would provide the connection for the call E~Ri~F l:~ESCRIPTl~ Qf th~ ~RAWIN~
Fig. 1 is a block diagram of a radio communication system in accordance to the present invention.
Fig. 2 is a flow chart of the operation of the wireless PABX
of Fig. 1.
2 0 Fig. 3 is a flow chart of the opera~ion of a base station oF
Fig. 1.
DE~S~IPTIQ~_ o7 the ~R.E~ BRi~D ~MBQDIMI~NT
Referring now by characters of reference of the drawings 2 5 and first ~o Fig. 1, it will be understood that the radio communication system 10 is designed to interface cordless telephones to the Public Switched Telephone Network (PSTN).
While the preferred embodiment is illustrated in the context of a CT-2 system, other similar systems could be utili~ed. In this 3 0 system 10, a plurality of portable radio telephon~ devices, such as CT-2 handsets 11 can interface with the PSTN via any one of a plurality of CT-2 base stations 12. Each CT-2 handset 11 is desi~ned as a low power transceiver which, when at its home base, is designed for receiving and originating telephone calls.
3 5 When away from its home base, the handset 11 can originate calls if it is within range of a CT-2 base station 12. The present ., i WO 91/13509 PClr/US91/00136 2~7~279 invention provides means for attempling to loca~e a CT-2 handset 11 when it is at a location other than its home base station. In operation, it is envisioned that each CT-2 handset would have two address codes, or phone numbers corresponding to home 5 location and one for use when it is away from its home location.
When a telephone user d~sires to contact a CT-2 handset user who is away from his home base, a t~lephone number corresponding to the remote ID would be dialed to connect the phone user to the wireless PABX 14, which can be a CT-2 switch 1 0 or a central telephone office. Such a wireless PABX can be coupled to a network controller center 16 via a data link 18 for purposes of system billing, handset ID, and the like. When a cal - is received at the wireiess PABX-14 for a par~icular CT-2 handset 11, the wir~less PABX would originate a paging message, which 1 5 would include an ID for the called CT-2 handset as well as connection information for connecting ~he CT-2 handset with the incoming phone call at the PABX. This information would be transmitted, as via a wide area paging transmitter 20. Each of the CT-2 base stations 12 include a paging receiver for receivin~ the 2 0 pa~e transrnissions. Thc CT-2 base stations are also connected to the wireless PABX as by phone lines or trunks 22.
Each CT-2 base station 12 can include a plurality of transceivers, as for example 6 for the simultaneous connection of up to 6 CT-2 handsets to 6 phone lines. In a CT-2 systsm forty RF
2 5 channels are available ~or use by the handsets 11 and base station 12. If a CT-2 base station 12 has an available transceiver and phone line when the page is received, the base station would choose one of the available RF channels and transmit a call with th~ called CT-2 hands~ts ID. Such calls could go on essentially 3 0 simultaneously at the various CT-2 bas~ stations 12 but would not nece~sarily be made on the same frequency. Each of the CT-2 handsets 11, if not in use, woul~ have a rec~ive mode in which it would be scanning the forty RF channels for calls with its ID. In the event that a page has been made for a CT-2 handset which is 3 5 in range of a CT-2 base station 12, having an available transceiver/phone line, ~he call that is made over one of the six ~7~79 4 voice channels would be received by the CT-2 handset which would then automatically acknowledge a call. The CT-2 base station, on receipt of the acknowledgement, would respond by dialing the wireless PABX 14 using the communication phone 5 line ID received with ~he page and wou!d also ring a signal to similarly causing a ring on the ~::T-2 handsat to al~r~ the user to the incomin~ phone call.
The operation of the wireless PABX 14 is illus~rated in the flow chart of Fig. 2. Beginning with start block 30, the wireless 1 0 PABX ~4 monitors the incoming phone lines to see if a call requ~st has b~en received, decision block 32. If so, the address from the PSTN trunk line is identified, block 34, and the PABX
then connects to the paging transmitter 20, block 36 to transmit a numeric page which would include the handset nd phone line ID
1 5 information, block 38. The PABX then monitors for a response to the page, decision block 40. If no response is received, an indioation such as a digiti2ed message would be given to th~
caller that there has been no answer, block 42 and the routin0 would then end, block 44 returnin~ to start block 30. If a response 2 0 is received, the phon~ lines from the CT-2 base station 12 and the incoming phone call would bc connected together, block 42 and the wireless PABX would maintain th~ interconnection for the duration of the conversation, until a hang-up is detected, block 44.
At that point the routine would end, block 44 and return to start 2 5 block 30.
The operation of the base station 12 is illustrated in flow chart Fig. 3. The routine star~s at block 50 and examines whether a call request has been received as via the paging signal, decision block 52. If not, the routins continues to monitor for a call 3 0 re~u~st . When a call r0quest is received, the handset l :) is extracted from ths numeric data, block 54. The base station then determines if a transceiver/phone line is available, decision block 56. If not the routine returns to start and doas not attempt to locate the called handset 11. If a voice channel is available, a call 3 5 including the handset ID is transmitted an an available RF
channel, block 58. The channel is monitored, ~lock 60, for a - ~ : . ' . . :.
.
' ' :
WO 9t/13509 PCI/US91/00136 2~7~79 handset response. If no response is received the routine would end and return to start, decision block 62. If r~sponse is received, the base station would dial back to the PABX, block 64 utilizing the the number received in the page and the CT-2 base sta~ion 5 would provide the RF connection between th0 hal1dset and phone line, block 66 until the conversation is ended, block 68.
It will b~ appreciated that this system does not require the use of a control channel for communications between the base stations 12 and hands~ts 11. The lo~ting of a particular handset 1 0 11 is accomplished by utilizing one of the available CT-2 RF
channels. Consequently, the handset need only be monitoring these RF channels as by scanning. If a handset is within range of a base station that is not curr0ntly fully utilized, the handset can be located and connected to an incoming phone call.
1 5 We clairn as our invention:
Claims (3)
1. A method of connecting an incoming telephone call to a wireless telephone comprising the steps of:
at a central system :
receiving an incoming telephone call for a particular wireless telephone, transmitting a radio paging signal including ID
information for the called wireless telephone, at a plurality of base stations:
receiving the transmitted radio paging signal ID
information, if a telephone line is available at the individual base station, selecting an available voice channel and transmitting a call to the called wireless telephone on said voice channel, and if a response is received from the wireless telephone providing a connection to the incoming telephone call.
at a central system :
receiving an incoming telephone call for a particular wireless telephone, transmitting a radio paging signal including ID
information for the called wireless telephone, at a plurality of base stations:
receiving the transmitted radio paging signal ID
information, if a telephone line is available at the individual base station, selecting an available voice channel and transmitting a call to the called wireless telephone on said voice channel, and if a response is received from the wireless telephone providing a connection to the incoming telephone call.
2. A method of connecting a telephone call as defined in claim 1, in which:
at the central system the transmitting ID information step includes transmitting phone line ID information.
at the central system the transmitting ID information step includes transmitting phone line ID information.
3. A radio communication system for connecting radios to a telephone network comprising:
a plurality of portable radio units, a plurality of base stations for selectively interconnecting said portable radio units to the telephone network, a central system for receiving incoming telephone calls and for transmitting radio paging signals including ID
information for called portable radio units to the plurality of base stations, the base stations each including means for receiving the transmitted radio paging signal ID information and means for determining if a telephone line is available, each base station transmitting a call to the called portable radio unit on a voice channel only if a telephone line is available.
a plurality of portable radio units, a plurality of base stations for selectively interconnecting said portable radio units to the telephone network, a central system for receiving incoming telephone calls and for transmitting radio paging signals including ID
information for called portable radio units to the plurality of base stations, the base stations each including means for receiving the transmitted radio paging signal ID information and means for determining if a telephone line is available, each base station transmitting a call to the called portable radio unit on a voice channel only if a telephone line is available.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48409790A | 1990-02-22 | 1990-02-22 | |
| US484,097 | 1990-02-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2075279A1 true CA2075279A1 (en) | 1991-08-23 |
Family
ID=23922734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002075279A Abandoned CA2075279A1 (en) | 1990-02-22 | 1991-01-07 | Radio communication system |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0516651A4 (en) |
| JP (1) | JPH05503619A (en) |
| KR (1) | KR960004959B1 (en) |
| AU (1) | AU633190B2 (en) |
| CA (1) | CA2075279A1 (en) |
| WO (1) | WO1991013509A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0546572B1 (en) * | 1991-12-12 | 1999-04-07 | Nec Corporation | Mobile communications system having central radio station for paging mobile users via base stations |
| SE500821C2 (en) * | 1992-02-17 | 1994-09-12 | Ericsson Telefon Ab L M | Methods and devices to support communication |
| US5361399A (en) * | 1992-06-02 | 1994-11-01 | Pagemart, Inc. | Adaptive communication system for transmitting between base stations and portable transceivers via different data rate communication links |
| JPH06112889A (en) * | 1992-09-29 | 1994-04-22 | Uniden Corp | Cordless system telephone set |
| US5644621A (en) * | 1994-01-11 | 1997-07-01 | Matsushita Electric Industrial Co., Ltd. | Point to multipoint radiotelephone system |
| CZ144496A3 (en) * | 1994-09-22 | 1996-12-11 | Philips Electronics Nv | Cordless telephone system, basic station and microphone thereof in such telephone system |
| US5594951A (en) * | 1994-10-07 | 1997-01-14 | Motorola, Inc. | Method and apparatus for saving power in a radiotelephone |
| US7035914B1 (en) | 1996-01-26 | 2006-04-25 | Simpleair Holdings, Inc. | System and method for transmission of data |
| GB2326310B (en) * | 1997-06-11 | 2002-04-17 | Dsc Telecom Lp | Establishing a wireless link between a central terminal and a subscriber terminal of a wireless telecommunications system |
| EP2111529B1 (en) | 2006-10-23 | 2015-08-26 | J.A. Woollam Co. Inc. | Directing a Beam of Electromagnetic Radiation into the end of an Optical Fibre Using Output from a Multiple Element Detector |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7607300A (en) * | 1976-07-02 | 1978-01-04 | Philips Nv | AUTOMATIC RADIO TELEPHONY SYSTEM. |
| JPS5919503B2 (en) * | 1978-02-24 | 1984-05-07 | 日本電信電話株式会社 | Tracking phone method |
| GB8419003D0 (en) * | 1984-07-25 | 1984-08-30 | Racal Res Ltd | Portable telephones |
| JPS61171299A (en) * | 1985-01-25 | 1986-08-01 | Shingo Kato | Exchange for connecting access |
| GB2179823A (en) * | 1985-08-28 | 1987-03-11 | Philips Electronic Associated | Communications system |
| JP2580129B2 (en) * | 1986-07-18 | 1997-02-12 | ソニー株式会社 | Transceiver |
-
1991
- 1991-01-07 EP EP19910903472 patent/EP0516651A4/en not_active Withdrawn
- 1991-01-07 AU AU72259/91A patent/AU633190B2/en not_active Ceased
- 1991-01-07 CA CA002075279A patent/CA2075279A1/en not_active Abandoned
- 1991-01-07 KR KR1019920702017A patent/KR960004959B1/en active IP Right Grant
- 1991-01-07 WO PCT/US1991/000136 patent/WO1991013509A1/en not_active Application Discontinuation
- 1991-01-07 JP JP3503557A patent/JPH05503619A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0516651A4 (en) | 1993-08-04 |
| KR960004959B1 (en) | 1996-04-18 |
| EP0516651A1 (en) | 1992-12-09 |
| KR920704486A (en) | 1992-12-19 |
| AU7225991A (en) | 1991-09-18 |
| JPH05503619A (en) | 1993-06-10 |
| WO1991013509A1 (en) | 1991-09-05 |
| AU633190B2 (en) | 1993-01-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19980107 |