CA2026020A1 - Transport vehicle approach notification systems - Google Patents
Transport vehicle approach notification systemsInfo
- Publication number
- CA2026020A1 CA2026020A1 CA 2026020 CA2026020A CA2026020A1 CA 2026020 A1 CA2026020 A1 CA 2026020A1 CA 2026020 CA2026020 CA 2026020 CA 2026020 A CA2026020 A CA 2026020A CA 2026020 A1 CA2026020 A1 CA 2026020A1
- Authority
- CA
- Canada
- Prior art keywords
- transmission signal
- transport vehicle
- customer
- receiver
- customers
- 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
Landscapes
- Traffic Control Systems (AREA)
- Emergency Alarm Devices (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A Transport Vehicle Approach Notification System consisting of a plurality of receivers in the possession of customers. Each receiver is responsive to a digitally coded transmission signal with distinct identifying characteristics thereby distinguishing the transmission signal intended for the customer from transmission signals intended for other customers. The receiver alerts the customer when a transmission signal has been received. A transmitter is mounted in the Transport Vehicle. The transmitter has means for varying the digital coding of the transmission signal transmitted. The digitally coded transmission signal of an individual passenger is transmitted as the transport vehicle approaches a prearranged pickup site.
A Transport Vehicle Approach Notification System consisting of a plurality of receivers in the possession of customers. Each receiver is responsive to a digitally coded transmission signal with distinct identifying characteristics thereby distinguishing the transmission signal intended for the customer from transmission signals intended for other customers. The receiver alerts the customer when a transmission signal has been received. A transmitter is mounted in the Transport Vehicle. The transmitter has means for varying the digital coding of the transmission signal transmitted. The digitally coded transmission signal of an individual passenger is transmitted as the transport vehicle approaches a prearranged pickup site.
Description
202~0'~0 The present invention relates to a Transport Vehicle Approach Notification Method and Apparatus.
BACK~ROUND OF THE INV~NT~ON
A novel form of School ~us Approach Notification Method and Apparatus was developed by Michael R. Bishop and is described in United States Patent 4,325,057.
This method involves the following steps. Firstly, transmitting from a school bus a radio signal with an 10 identifying characteristic distinguishing the bus from other buses. Secondly, providing to the residences of all students along the school bus route a receiver which receives a signal when the school bus is a predetermined distance away to alert the student to the approach of 15 the school bus.
The Bishop system has now been in use for a period of time and certain disadvantages have become apparent.
With acreage subdivisions where a number of residences 20 are positioned in relatively close proximity on one to three acre plots, the school bus unavoidable alerts the entire subdivision as it enters even though it may take considerable time to complete all pick ups within the subdivision. This results in the vary problem the 25 system was intended to prevent, that being children waiting -outdoors for pickup in adverse weather conditions. The strength of the signal varies with weather and terrain, thi~ results in the interval between the receiving of the signal and actual pick up 30 being inconsistent. The receivers can be inadvertently $alsely; triggered by 'a ~tray frequency generated by another transmitter. The ~ystem is not suitable for other types of transport vehicles such as taxicabs, 35 although there is a need for such an Approach Notification System, especially for the disabled.
BACK~ROUND OF THE INV~NT~ON
A novel form of School ~us Approach Notification Method and Apparatus was developed by Michael R. Bishop and is described in United States Patent 4,325,057.
This method involves the following steps. Firstly, transmitting from a school bus a radio signal with an 10 identifying characteristic distinguishing the bus from other buses. Secondly, providing to the residences of all students along the school bus route a receiver which receives a signal when the school bus is a predetermined distance away to alert the student to the approach of 15 the school bus.
The Bishop system has now been in use for a period of time and certain disadvantages have become apparent.
With acreage subdivisions where a number of residences 20 are positioned in relatively close proximity on one to three acre plots, the school bus unavoidable alerts the entire subdivision as it enters even though it may take considerable time to complete all pick ups within the subdivision. This results in the vary problem the 25 system was intended to prevent, that being children waiting -outdoors for pickup in adverse weather conditions. The strength of the signal varies with weather and terrain, thi~ results in the interval between the receiving of the signal and actual pick up 30 being inconsistent. The receivers can be inadvertently $alsely; triggered by 'a ~tray frequency generated by another transmitter. The ~ystem is not suitable for other types of transport vehicles such as taxicabs, 35 although there is a need for such an Approach Notification System, especially for the disabled.
SUMMARY OF TH~ INVENTION
What is required is a Transport Vehicle Approach Notification âystem Method which overcomes these disadvantages.
Accordiny to this aspect of the invention there is provided a Method of Transport Vehicle Approach Notification, which is comprised of the following steps.
Firstly, provide to each customer of a Transport Vehicle 10 a receiver responsive to a transmission signal with distinct identifying characteristics distinguishing the transmission signal intended for the customer from transmission signals intended for other customers of the Transport Vehicle. The receiver must have means for 15 alerting the customer that a transmission signal has been received. Secondly, equip the Transport Vehicle with a transmitter having means for varying the transmission signal transmitted. The transmission signal of an individual is transmitted as the transport 20 vehicle approaches a prearranged pickup site for that customer.
With the present invention the driver of a passenger transport vehicle alerts individual passengers 25 as he approaches their designated pick up site. The receiver units can be carried by the passenger enabling the pick up site to vary with the requirements of the passenger. This is especially useful for disabled persons who need advance warning of pickup from public 30 places such as shopping malls. Any passenger transport vehicle in the fleet can be sent as the transmission signal generated is unique to the individual passenger.
This is equally applicable to freight transport 35 vehicles. For example, security personnel at financial , 202602(1 institutiolls could benefit from advance warning that an armoured vehicle is arriving to pick up or drop off shipments of money.
:
Although beneficial results may be obtained through the use of the transport vehicle approach notification system described, there are further features which the Applicant prefers to incorporate in the system to address potential problems which are encountered by 10 school bus operators. A mechanical problem which disables a school bus loaded with children on an isolated rural road during adverse weather is a potentially dangerous situation. How can the driver of the school bus seek emergency assistance, assuming some 15 assistance i5 potentially available, without leaving his charges? Experience has shown that children are "at risk" from the moment they leave their homes until they are physically on the school bus. Often the pick up site for the school bus is out of sight of the 20 residence. On the way from their residence to the pick up site children can potentially be injured, abducted, or meet with other misadventure. In one instance a little girl refused to board the school bus. After waiting a reasonable length of time and prevailing upon 25 the little girl to please get on the bus; the scho~l bus driver drove away assuming the little girl would go back to her residence. The little girl froze by the side of the road. How can a parent know that the child has safely got on the bus? Even more beneficial results 3~ may therefore be obtained by having the receiver responsive to at least one secondary transmission signal. The receiver must have means for alerting per~ons in the residence that a secondary transmission 35 signal has been received.
What is required is a Transport Vehicle Approach Notification âystem Method which overcomes these disadvantages.
Accordiny to this aspect of the invention there is provided a Method of Transport Vehicle Approach Notification, which is comprised of the following steps.
Firstly, provide to each customer of a Transport Vehicle 10 a receiver responsive to a transmission signal with distinct identifying characteristics distinguishing the transmission signal intended for the customer from transmission signals intended for other customers of the Transport Vehicle. The receiver must have means for 15 alerting the customer that a transmission signal has been received. Secondly, equip the Transport Vehicle with a transmitter having means for varying the transmission signal transmitted. The transmission signal of an individual is transmitted as the transport 20 vehicle approaches a prearranged pickup site for that customer.
With the present invention the driver of a passenger transport vehicle alerts individual passengers 25 as he approaches their designated pick up site. The receiver units can be carried by the passenger enabling the pick up site to vary with the requirements of the passenger. This is especially useful for disabled persons who need advance warning of pickup from public 30 places such as shopping malls. Any passenger transport vehicle in the fleet can be sent as the transmission signal generated is unique to the individual passenger.
This is equally applicable to freight transport 35 vehicles. For example, security personnel at financial , 202602(1 institutiolls could benefit from advance warning that an armoured vehicle is arriving to pick up or drop off shipments of money.
:
Although beneficial results may be obtained through the use of the transport vehicle approach notification system described, there are further features which the Applicant prefers to incorporate in the system to address potential problems which are encountered by 10 school bus operators. A mechanical problem which disables a school bus loaded with children on an isolated rural road during adverse weather is a potentially dangerous situation. How can the driver of the school bus seek emergency assistance, assuming some 15 assistance i5 potentially available, without leaving his charges? Experience has shown that children are "at risk" from the moment they leave their homes until they are physically on the school bus. Often the pick up site for the school bus is out of sight of the 20 residence. On the way from their residence to the pick up site children can potentially be injured, abducted, or meet with other misadventure. In one instance a little girl refused to board the school bus. After waiting a reasonable length of time and prevailing upon 25 the little girl to please get on the bus; the scho~l bus driver drove away assuming the little girl would go back to her residence. The little girl froze by the side of the road. How can a parent know that the child has safely got on the bus? Even more beneficial results 3~ may therefore be obtained by having the receiver responsive to at least one secondary transmission signal. The receiver must have means for alerting per~ons in the residence that a secondary transmission 35 signal has been received.
4 2~2~20 The secondary signals are "codes" which enable the bus driver to communicate with the parents of the children. The Applicant's have incorporated in their system one secondary signal with warning light and auditory tone to indicate a mechanical problem with the school bus, or emergency condition. The Applicant's have also incorporated in their system another secondary signal with warning light and auditory tone to indicate the child has safely gotten onto the school bus. This 10 secondary transmission signal capability is only required for school bus use and would not be incorporated in the mobile receivers used by the disabled. This feature is equally applicable to freight transport vehicles. Using an example of armoured 15 vehicles used for money shipments, a secondary signal could be u~ed to indicate, mechanical problems with the vehicle, a robbery in progress, or any other message which it would be desirable to communicate for security reasons.
According to another aspect of the invention there is provided a Transport Vehicle Approach Notification System which is comprised of a plurality of receivers in the possession of customers. Each receiver is responsive 25 to a digitally coded transmission signal with distinct identifying characteristics thereby distinguishing the transmission signal intended for the customer from transmission signals intended for other customers. The receiver has means for alerting the customer that a 30 transmission signal has been received. A transmitter is mounted in the Transport Vehicle. The transmitter has means for varying the digital coding of the transmission signal transmitted. The digitally coded transmission 35 signal of an individual customer is transmitted as the transport vehicle approaches a prearranged pickup site.
202~0'~0 BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to ths appended drawings, 5 wherein: .-FIG~RE 1 is a block diagram of a receiver constructed in accordance with the teachings of the present invention.
FIGURE 2 is a block diagram of a transmitter 10 constructed in accordance with the teachings of the present invention.
DETAILE~ DESCRIPTION OF THE PREFERRED EMBODIMENT .
The preferred embodiment, a Transport Vehicle 15 Approach Notification System generally identified by reference numeral 10, will now be described with reference to FIGURES 1 and 2. The primary components of Passenger Transport Vehicle Approach Notification System 10 are a transmitter 12 and a receiver 14.
~ :
Receiver 14 is responsive to a digitally coded : ::
transmission signal with distinct identifying characteristics distinguishing the transmission signal intended for the customer from transmission signals 25 intended for other customers. Referring to FIGURE 1, receiver 14 consists of a receiving unit 18, a data ~ :
detector 20, and an alert trigger 22 which is connected to a speaker 24 and three lights 26, 28, and 30.
Transmitter 12 is mounted in a Transport Vehicle (not shown). Referring to FIGUR~ 2, transmitter 12 consists of the following components; a microprocessor 32, a keyboard 34, data down 36, data up 38, display 35 drivers 40a and 40b, display units 42a and 42b, data ~ ~
:: . - - -~ ' ' ' L L~
",,", 202~020 ~ ~
selector 44, oscillator 46, keyer 48, power amplifier 50, sensor 52, and printer 54.
The use and opera-tion of transmitter 12 and receiver 14 will now be described with reference to FIGURES 1 and 2. The method of use of Transport Vehicle Approach Notification 10 consists of the following steps. Each customer of a Transport Vehicle is provided with receiver 14. Receiver 14 is responsive to a 10 digitally coded transmission signal with distinct identifying characteristics as will be hereinafter described. The digital coding distinguishes the transmission signal intended for the customer from transmission signals intended for other customers of the 15 same frequency. Receiver 14 emits an auditory tone and a visible warning light to alert the customer that a transmission signal has been received. The Transport Vehicle is equipped with transmitter 12 which is capable of varying the identifying digital coding 20 characteristics of the transmission signal transmitted.
This enables the transmission signal of an individual customer to be transmitted as the transport vehicle approaches a prearranged pickup site. Unlike prior art devices the range of the transmitter need not be 25 limited. A single transmission signal permits a single message to be transmitted to the customer. The communication with the customer can be increased by having a series of lights each one representing a slightly different or "secondary" digital signal. Each 30 light has a different significance and communicates a different message to the customer. In the context of a school bus, one secondary signal could indicate a successful pickup and another secondary signal could 35 indicate an emergency situation. In the context of an armoured vehicle, one secondary signal could indicate a - ~0~020 mechanical breakdown, and another secondary signal could indicate a robbery in progress.
Referring to FIGURE 2, transmitter 14 is controlled by microprocessor 32, which can be preprogrammed through appropriate software to perform such functions as sequential "autodialling" of the digital codes of customers along the transport vehicles route. Keyboard 34 is used to key in digital codes of individual 10 customers or trigger the next selection on a sequential autodial program. Data down 36 and data up 38 components are provided to select the appropriate order of entries in the sequential autodial. An example as to where this feature would be required is with a school 15 bus which follows a regular route in the morning and follows the same route in reverse ordcr in the afternoon. The data up 38 takes the numbers in one order and data down 36 takes the digital numbers in the reverse order. Once data up 38 or data down 36 has been 20 selected the appropriate display driver 40a or 40b and the appropriate display unit 42a or 42b is accessed.
The display drivers 40a and 40b convert the digital codes into analog for the purposes of their respective display units 42a or 42b. Data selector 44, chooses the 25 next digital code in the data up or data down sequential autodial sequence. This digital code can be equated to the settings used on garage door openers. Oscillator 4~
generates a communication frequency. This frequency can be AM band radio frequency, FM band radio frequency or 30 infrared frequency. ~eyer 48 serves to place the digital code within the frequency generated by oscillator 46. Power amplifier 50 serves to amplify the signal for the purposes of transmission. The addition of 35 sensor 52 enables microprocessor ~to monitor other variables. An example of where this feature would be : :
2~2 ~j ,)20 used is with school buses. Some school bus driver~ are compensated by both -the pick up and mileage. Sensor 52 -can be coupled with the odometer of the vehicle to monitor mileage travelled in relatiGn to pickups. It is also desirable to have a time clock incorporated into the system, so that actual pickup times and travel times between pickups can be monitored. Printer 54 i5 provided as a means of obtaining a hard printout copy of the data from microprocessor 32.
Receive unit 18 of receiver 14 receives all transmission signals. Data Detector 20 determines whether the transmission signal contains the customers digital code. Alert trigger 22 causes an auditory 15 signal to be triggered in speaker 24 that a transmission signal with the correct digital coding has been received. Alert trigger 22 also causes one of lights 26 28 or 30 to be illuminated depending upon the digital signal received. Each one of lights 26, 28, and 20 30 would have a different significance to the customer.
It will be apparent to one skilled in the art that ~ransport Vehicle Approach Notification System 10 and the underlying method overcomes a number of the 25 disadvantages prevalent in the art. It will also be apparent to one skilled in the art that modifications can be made to the preferred embodiment of the invention without departing from the spirit and scope of the invention as defined in the Claims.
' . ~, ~'' ~ ; ~t'`
';
According to another aspect of the invention there is provided a Transport Vehicle Approach Notification System which is comprised of a plurality of receivers in the possession of customers. Each receiver is responsive 25 to a digitally coded transmission signal with distinct identifying characteristics thereby distinguishing the transmission signal intended for the customer from transmission signals intended for other customers. The receiver has means for alerting the customer that a 30 transmission signal has been received. A transmitter is mounted in the Transport Vehicle. The transmitter has means for varying the digital coding of the transmission signal transmitted. The digitally coded transmission 35 signal of an individual customer is transmitted as the transport vehicle approaches a prearranged pickup site.
202~0'~0 BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to ths appended drawings, 5 wherein: .-FIG~RE 1 is a block diagram of a receiver constructed in accordance with the teachings of the present invention.
FIGURE 2 is a block diagram of a transmitter 10 constructed in accordance with the teachings of the present invention.
DETAILE~ DESCRIPTION OF THE PREFERRED EMBODIMENT .
The preferred embodiment, a Transport Vehicle 15 Approach Notification System generally identified by reference numeral 10, will now be described with reference to FIGURES 1 and 2. The primary components of Passenger Transport Vehicle Approach Notification System 10 are a transmitter 12 and a receiver 14.
~ :
Receiver 14 is responsive to a digitally coded : ::
transmission signal with distinct identifying characteristics distinguishing the transmission signal intended for the customer from transmission signals 25 intended for other customers. Referring to FIGURE 1, receiver 14 consists of a receiving unit 18, a data ~ :
detector 20, and an alert trigger 22 which is connected to a speaker 24 and three lights 26, 28, and 30.
Transmitter 12 is mounted in a Transport Vehicle (not shown). Referring to FIGUR~ 2, transmitter 12 consists of the following components; a microprocessor 32, a keyboard 34, data down 36, data up 38, display 35 drivers 40a and 40b, display units 42a and 42b, data ~ ~
:: . - - -~ ' ' ' L L~
",,", 202~020 ~ ~
selector 44, oscillator 46, keyer 48, power amplifier 50, sensor 52, and printer 54.
The use and opera-tion of transmitter 12 and receiver 14 will now be described with reference to FIGURES 1 and 2. The method of use of Transport Vehicle Approach Notification 10 consists of the following steps. Each customer of a Transport Vehicle is provided with receiver 14. Receiver 14 is responsive to a 10 digitally coded transmission signal with distinct identifying characteristics as will be hereinafter described. The digital coding distinguishes the transmission signal intended for the customer from transmission signals intended for other customers of the 15 same frequency. Receiver 14 emits an auditory tone and a visible warning light to alert the customer that a transmission signal has been received. The Transport Vehicle is equipped with transmitter 12 which is capable of varying the identifying digital coding 20 characteristics of the transmission signal transmitted.
This enables the transmission signal of an individual customer to be transmitted as the transport vehicle approaches a prearranged pickup site. Unlike prior art devices the range of the transmitter need not be 25 limited. A single transmission signal permits a single message to be transmitted to the customer. The communication with the customer can be increased by having a series of lights each one representing a slightly different or "secondary" digital signal. Each 30 light has a different significance and communicates a different message to the customer. In the context of a school bus, one secondary signal could indicate a successful pickup and another secondary signal could 35 indicate an emergency situation. In the context of an armoured vehicle, one secondary signal could indicate a - ~0~020 mechanical breakdown, and another secondary signal could indicate a robbery in progress.
Referring to FIGURE 2, transmitter 14 is controlled by microprocessor 32, which can be preprogrammed through appropriate software to perform such functions as sequential "autodialling" of the digital codes of customers along the transport vehicles route. Keyboard 34 is used to key in digital codes of individual 10 customers or trigger the next selection on a sequential autodial program. Data down 36 and data up 38 components are provided to select the appropriate order of entries in the sequential autodial. An example as to where this feature would be required is with a school 15 bus which follows a regular route in the morning and follows the same route in reverse ordcr in the afternoon. The data up 38 takes the numbers in one order and data down 36 takes the digital numbers in the reverse order. Once data up 38 or data down 36 has been 20 selected the appropriate display driver 40a or 40b and the appropriate display unit 42a or 42b is accessed.
The display drivers 40a and 40b convert the digital codes into analog for the purposes of their respective display units 42a or 42b. Data selector 44, chooses the 25 next digital code in the data up or data down sequential autodial sequence. This digital code can be equated to the settings used on garage door openers. Oscillator 4~
generates a communication frequency. This frequency can be AM band radio frequency, FM band radio frequency or 30 infrared frequency. ~eyer 48 serves to place the digital code within the frequency generated by oscillator 46. Power amplifier 50 serves to amplify the signal for the purposes of transmission. The addition of 35 sensor 52 enables microprocessor ~to monitor other variables. An example of where this feature would be : :
2~2 ~j ,)20 used is with school buses. Some school bus driver~ are compensated by both -the pick up and mileage. Sensor 52 -can be coupled with the odometer of the vehicle to monitor mileage travelled in relatiGn to pickups. It is also desirable to have a time clock incorporated into the system, so that actual pickup times and travel times between pickups can be monitored. Printer 54 i5 provided as a means of obtaining a hard printout copy of the data from microprocessor 32.
Receive unit 18 of receiver 14 receives all transmission signals. Data Detector 20 determines whether the transmission signal contains the customers digital code. Alert trigger 22 causes an auditory 15 signal to be triggered in speaker 24 that a transmission signal with the correct digital coding has been received. Alert trigger 22 also causes one of lights 26 28 or 30 to be illuminated depending upon the digital signal received. Each one of lights 26, 28, and 20 30 would have a different significance to the customer.
It will be apparent to one skilled in the art that ~ransport Vehicle Approach Notification System 10 and the underlying method overcomes a number of the 25 disadvantages prevalent in the art. It will also be apparent to one skilled in the art that modifications can be made to the preferred embodiment of the invention without departing from the spirit and scope of the invention as defined in the Claims.
' . ~, ~'' ~ ; ~t'`
';
Claims (3)
1. A Method of Transport Vehicle Approach Notification, comprising the steps of:
a. firstly, providing to each customer of a Transport Vehicle a receiver responsive to a transmission signal with distinct identifying characteristics distinguishing the transmission signal intended for the customer from transmission signals intended for other customers of the Transport Vehicle, the receiver having means for alerting the customer that a transmission signal has been received;
b. secondly, equipping the Transport Vehicle with a transmitter having means for varying identifying characteristics of the transmission signal transmitted, whereby the transmission signal of an individual customer is transmitted as the transport vehicle approaches a prearranged pickup site.
a. firstly, providing to each customer of a Transport Vehicle a receiver responsive to a transmission signal with distinct identifying characteristics distinguishing the transmission signal intended for the customer from transmission signals intended for other customers of the Transport Vehicle, the receiver having means for alerting the customer that a transmission signal has been received;
b. secondly, equipping the Transport Vehicle with a transmitter having means for varying identifying characteristics of the transmission signal transmitted, whereby the transmission signal of an individual customer is transmitted as the transport vehicle approaches a prearranged pickup site.
2. The Method of Transport Vehicle Approach Notification as defined in Claim 1, the receiver being responsive to at least one secondary transmission signal, the receiver having means for alerting customers that a secondary transmission signal has been received.
3. A Transport Vehicle Approach Notification System, comprising:
a. a plurality of receivers in the possession of customers, each receiver being responsive to a transmission signal with distinct identifying characteristics established through digital coding to distinguish the transmission signal intended for the customer from transmission signals intended for other customers, the receiver having means for alerting the customer that a transmission signal has been received;
b. a transmitter mounted in the Transport Vehicle, the transmitter having means for varying the digital coding of the transmission signal transmitted, whereby the transmission signal of an individual customer is transmitted as the transport vehicle approaches a prearranged pickup site.
a. a plurality of receivers in the possession of customers, each receiver being responsive to a transmission signal with distinct identifying characteristics established through digital coding to distinguish the transmission signal intended for the customer from transmission signals intended for other customers, the receiver having means for alerting the customer that a transmission signal has been received;
b. a transmitter mounted in the Transport Vehicle, the transmitter having means for varying the digital coding of the transmission signal transmitted, whereby the transmission signal of an individual customer is transmitted as the transport vehicle approaches a prearranged pickup site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2026020 CA2026020A1 (en) | 1990-09-24 | 1990-09-24 | Transport vehicle approach notification systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2026020 CA2026020A1 (en) | 1990-09-24 | 1990-09-24 | Transport vehicle approach notification systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2026020A1 true CA2026020A1 (en) | 1992-03-25 |
Family
ID=4146039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2026020 Abandoned CA2026020A1 (en) | 1990-09-24 | 1990-09-24 | Transport vehicle approach notification systems |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2026020A1 (en) |
-
1990
- 1990-09-24 CA CA 2026020 patent/CA2026020A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |