IDENTIFICATION DEVICES
First Claim
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1. An identification device comprising an ultrasound transmitter unit and an outer housing which receives said transmitter unit, said outer housing comprising one or more apertures which are sealed by a membrane, said membrane being substantially transparent to ultrasound when compared to the rest of the housing.
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Abstract
An identification device comprising an ultrasound transmitter unit (16) and an outer housing (6) which receives said transmitter unit (16), said outer housing (6) comprising one or more apertures (32) which are sealed by a membrane, said membrane being substantially transparent to ultrasound when compared to the rest of the housing.
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Citations
34 Claims
- 1. An identification device comprising an ultrasound transmitter unit and an outer housing which receives said transmitter unit, said outer housing comprising one or more apertures which are sealed by a membrane, said membrane being substantially transparent to ultrasound when compared to the rest of the housing.
- 13. An identification device comprising a transmitter unit received in an outer housing, the outer housing comprising a single-use attachment arrangement for attaching the device to a wrist strap.
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16. A portable identification device comprising a transmitter unit and a battery for the transmitter unit which are received separately in an outer housing so that the transmitter unit can be removed from or installed into the outer housing independently of the battery.
Specification