N.v. Nederlandsche Apparatenfabriek Nedap

Vitatron Scientific B.v.

Johannes H Hogen Esch

Hendrik J De Jong

Harm J Kip

Jan H De Jonge

A deactivation and coding system for a contactless antitheft or identification label, uses a pyrotechnic material to burn away a track portion, whereby an electrical connection is severed. The labels in the system according to the invention consist of tuned circuits in the form of one or more coil/capacitor combinations. Deactivation can be effected by severing the connection between a coil and the associated capacitor. Coding can be effected by severing the connection with one of several parallel-connected coils or capacitors. Coding can also be effected by removing an initial short-circuit of one of several series-connected capacitors. The pyrotechnic material may consist of one or a combination of the mixtures Pb.sub.3 O.sub.4, Si, Ti and Fe.sub.2 O.sub.3 ; PbCrO.sub.4, and Zr; Pb.sub.3 O.sub.4, Si and KNO.sub.2 ; and Pb.sub.3 O.sub.4 and Si or a mixture having comparable properties. The heat released during the combustion reaction can be used in combination with a thermosensitive paper for the purpose of causing readable information to appear on the label upon deactivation or coding. The use of protective foils can prevent damage to the goods on which the labels are provided.

Deactivation and coding system for a contactless antitheft or

Implantable biomedical sensor device for measuring in vivo the presence and/or concentration of physiological substances, such as the concentration of glucose, in a human or animal body. A miniaturized electronic responder (1) arranged in a closed housing (2) of biocompatible material in an electromagnetic interrogation field is capable of contactlessly exchanging binary coded information with a transmitter/receiver, and includes electrical connections (4, 5, 6) passed through the wall of the housing, at least a work electrode (10), a counter-electrode (8) and preferably also a reference electrode (9) outside the housing. The work electrode includes a membrane (13) with hollow fibers extending transversely to the surface of the membrane and having internal walls coated with a conductive polymer (15) and in which a redox enzyme (16) is disposed. One end of the hollow fibers is in electrical contact with a processing device (20) which converts the signals supplied by the work electrode in operation to binary signals.

Implantable biomedical sensor device, suitable in particular for

An electronic identification system comprises at least one transmitter capable of generating an interrogation field in an interrogation zone and a plurality of responders capable of generating a pre-determined coded signal in response to an interrogation field. The signal can be detected by at least one receiver. According to the invention, the at least one responder has a receiver circuit adapted to be brought into a first mode in which the receiver circuit forms a tuned narrow-banded circuit and into a second mode in which the receiver circuit forms a broad-banded circuit.

Electronic identification system

A detection label for an anti-shoplifting system, comprises a housing (2) accommodating an electrical circuit (21) detectable by an electromagnetic interrogation field, a needle (1) for securing the detection label to an article to be safeguarded, and a locking device (4, 8, 9) for locking the needle. The housing includes a fixed clip (3) which together with the rest of the housing encloses a slot-like free space, a cavity (7) for receiving the tip of the needle (1) which is placed within the housing, an operating push button device (4, 6) for moving the needle towards the clip, and a guide bore (20) in a fabric clamp (6) for guiding the needle during its movement toward the clip.

Detection label for an anti-shop-lifting system

In a detection plate, an electronic circuit capable of being activated by a suitable interrogation field to generate a pre-determined signal is provided with pin-shaped attachment means arranged so that the unauthorized detachment of the attachment means results in the interruption of an electrical conductor forming part of said electronic circuit. In the embodiment the detection plate is an earmark for animals and the attachment means includes a pin integral with the plate. The pin has a point which can be pushed through an animal's ear and the device can then be fastened on the other side of the ear. The pin includes a conductive loop which extends into the point and is connected to the electronic circiut of the plate.

Detection plate having pin-shaped attachment means

A method of, and apparatus for, automatically applying a milking cluster. An animal to be milked and the milking cluster are first coarsely positioned relatively to each other, followed by detecting the position of at least the animal's teats relative to at least the teat cups of the milking cluster by means of ultrasonorous waves, then accurately positioning the teat cups of the milking cluster relatively to the teats, starting from the detected position of the teats, and finally applying the teat cups to the teats.

Method and apparatus for automatically applying a milking cluster

An electromagnetic detection system comprising transmission unit for producing in at least one first detection zone an electromagnetic interrogation field. The system includes a plurality of responders having attachment element for attachment to articles to be protected, each including a resonant circuit and when present in a detection zone, in response to the interrogation field, producing a signal. The system further includes a first detection adapted to detect a responder and, on detection of a responder, to produce a warning signal. According to the invention, the responders are designed in such a manner that when the attachment elements are removed or when a responder is damaged, at least one frequency determining parameter of the responder is changed in a predetermined manner. At least one second detection zone is provided wherein responders with the at least one changed frequency determining parameter can be detected.

Electromagnetic detection system, as well as a responder for such a

There is provided a motor control system adapted for use, for example, with a sample analyzer, having means for generating signals representative of motor movement, and a logic circuit for analyzing the motor movement signals to determine increments of movement and the direction of movement. Digital circuitry is also provided for tracking the actual motor position as it is moved in either a forward or reverse direction, and comparing the tracked position with a programmed destination position. When and only when the motor is within a predetermined range of the destination position is a variable control generated, causing braking of the motor so that it stops exactly at the programmed destination position.

Motor control system for use in an apparatus for performing tests and

An apparatus for performing tests and measurements on liquid samples comprises three identical juxtaposed stationary trays each provided with a plurality of receptacles for the samples to be examined. The receptacles are integrally molded in the trays. The receptacles of the first tray serve as storage vessels for the samples, and the receptacles of the two other trays serve as processing vessels. Three stations arranged above the trays and displaceable with respect to the same in a horizontal plane serve for transferring the samples from the first tray to the second and the third tray, for adding reagents and for discharging the reaction products from the receptacles of the second and the third tray. Each of the stations comprises a carriage displaceable over the trays in an X-direction and a hollow needle for injecting and removing liquids supported by the carriage and displaceable with respect to the same in an Y-direction perpendicular to the X-direction. The carriages and the needles are driven by associated belts, each adapted to be displaced by an associated drum driven by a D.C. motor. The arrangement of the belts and the dimensions of the drums are such that the movement of a needle in one of the said directions does not involve a movement in the other direction, and that each carriage and each needle may be displaced through its entire range by one revolution of the associated drum.

Growing community of inventors

Aalten, Netherlands

Johannes H Hogen Esch