Csir

Trolley Scan (proprietary) Limited

British Technology Group Limited

Trevor M Hodson

Michael J Marsh

Raymond Catherall Atkins

Michael John Camille Marsh

Mario Alphonso Marais

Mark H Carson

Annemarie Van Den Doel

Jan G Pieterse

Franz Peschl

James P Tolmay

Tricia D Ritter

Gideon J Gouws

An identification system is provided for identifying a plurality of randomly aligned object-based transponders () passing through a predetermined reading volume. A reader () includes multiple transmitting and receiving antenna arrays () which are arranged sequentially to transmit interrogating and energizing fields () into the reading volume, with each energizing field having a different polarisation. Each transponder () is arranged to be powered by at least one of the interrogating and energizing fields, and includes a short term memory module () which is arranged to record the successful transmission or otherwise of the identification signal of the transponder () and to retain the record in the absence of a power supply to the transponder. The short term memory module has a retention time longer than any predicted interruption of power supply to the transponder via one of the energizing fields within the reading volume. The minimum memory retention time is typically the time period taken for the sequential transmission of all but one of the interrogating and energizing fields () during an interrogation cycle.

Multi-dimensional electronic identification of articles

An identification system is provided for identifying a plurality of object-based transponders ( ) using an interrogator ( ). The interrogator ( ) includes a transmitter for transmitting an interrogation signal to the transponders, a receiver for receiving identification signals from the transponders, and processor means ( ) for determining the individual and correct receipt of an identification signal. The transponders operate on the basis of backscatter modulation, and include a detector for detecting the presence of an interrupt signal from the interrogator. Control logic responsive to the detector is arranged to cease signal transmission from the transponder if the transponder completes transmission of the identification signal without receiving an interrupt signal during such transmission. The interrogator ( ) is arranged to receive the identification signals from the transponders ( ) and substantially contemporaneously to determine if any identification signal has been individually and correctly received. In the event of any identification signal is being individually and correctly received, the interrogator ( ), at substantially the same time, transmits a common interrupt signal for temporarily suspending signal transmission from a transponder ( ) if the transponder is transmitting its identification signal at the time it receives the interrupt signal. The transponder ( ) independently ceases signal transmission if it completes transmission of an identification signal without receiving an interrupt signal.

Identification of objects by a reader

Integrated circuits such as transponders are attached to a substrate such as cardboard packaging material by adhering an integrated circuit in the substrate, applying a patch antenna to the substrate and the integrated circuit, and applying a sealing layer over the integrated circuit and at least a portion of the antenna. In variations of the method, an indentation may be formed in the substrate into which the integrated circuit is placed. The patch antenna may be screen printed onto the substrate and the integrated circuit, using conductive ink, or may be a metallic foil which is applied to the substrate and the integrated circuit. Where the integrated circuit is a transponder, it can be programmed with an identification code, either before or after being attached to the substrate.

Attaching an electronic circuit to a substrate

Apparatus is provided for activating a plurality of groups of electrical loads, such as electrical detonators used in blasting, after respective time delays. The apparatus comprises a master control unit which generates master control signals to initiate timing out of delay devices associated with each load. The apparatus further includes several auxiliary control units which are connectable to the master control unit. Each auxiliary control unit is adapted to control a respective group of remote electrical delay devices with associated electrical loads. Each auxiliary control unit includes local control means for generating local control signals from the master control signals which are synchronised with the local control signals of other auxiliary control units, for initiating operation of the delay devices, so that a large blast can be carried out in a perfectly synchronised manner. The master control unit may transmit master programming signals to the auxiliary control units, which each program the electrical delay devices of their respective group. Synchronisation of the local control signals can be achieved in a number of different ways. A method of activating a plurality of groups of electrical loads is also described.

Surface blasting system

A method of establishing a telecommunications network. The method includes the steps of providing a network of local stations joined to one another by microwave links, and arranging, in a cluster around each local station, a plurality of subscriber, or telephone stations, each subscriber station having a unique code. Optical telecommunications links are then established between the subscriber stations and their associated local station. The operation of the network is managed using a system controller, which includes a system controller database incorporating a network map, subscriber and local station data. Associated local databases are established at each of the local stations, and the various databases are continuously and automatically updated via the network in response to a change on the configuration of the network.

Telecommunications network having a distributed network of decentralized

The invention relates to a printing apparatus comprising a printing track defining a print receiving surface and a printing carriage arranged to travel along the printing track. The carriage includes printing heads arranged to receive data from a central database for printing on the printing surface at predetermined positions along the printing track, and a roller arrangement for driving the carriage along the printing track. An optical position encoder is provided for monitoring the movement of the carriage as it travels along the printing track. A data transmission link is provided for interfacing the central database to the carriage. The central database includes both positional data for controlling the position of the printing heads and pricing data. The printing track has mounting clips for mounting it on a shelf edge, and the printing heads are arranged to label items of stock on the shelf. The invention extends to the printing track, the printing carriage, a shelf labelling system, as well as to a method of labelling a row of items of stock.

Shelf mountable printing apparatus

The invention relates to a blasting apparatus for activating a plurality of electrical detonators after predetermined time delays. The blasting apparatus includes a plurality of remote electrical delay devices. Each device is linked to a detonator, and is arranged to be serially programmed with a timing signal, which originates from the central control unit and which determines the time delay. A bidirectional signal harness, having ends which terminate at I/O ports in the control unit, serially links the delay devices to the control unit. In the event of a fault of discontinuity occurring in the harness prior to programming of the delay devices, the discontinuity is detected and the direction of programming along the bidirectional harness is reversed so that those delay devices which, due to the break, cannot be programmed in the initial direction, are programmed with timing signals travelling along the signal line in the opposite direction. The invention extends to a method of activating a plurality of electrical detonators, as well as to the individual delay devices forming part of the blasting apparatus.

Timing apparatus

A communication system comprises a control station and a number of remote stations connected to the control station by a multi-conductor harness. The control station houses a computer and supplies the remote stations with electrical power, as well as communicating bidirectionally with the remote stations, via the harness. At each remote station, a sensor or other functional module is plugged into an interface. Communication circuitry receives data from and sends data to the control station. The remote station includes an identification device for storing a first code allocated to the remote station by the central computer which identifies the relative location of the remote station, as well as a second code generated at the remote station which identifies the function of the sensor or other functional module.

Growing community of inventors

Randburg, South Africa

Trevor M Hodson