Carter Holt Harvey Plastic Products Group Limited

Other

Raymond J Pryor

James F Pharaoh

Graham Francois Duirs

Andrew Bryce Smith

Hugh Corum Sintes

James F Pharoah

Mario Brian Daniel Becroft

A level sensor for providing an indication of liquid level in a container. The level sensor including an ultrasonic transducer for emitting an ultrasonic signal to the surface of the liquid and for detecting a return signal, reflected from the surface. A controller instructs the transducer to emit ultrasonic signals and receives an indication that a return signal has been detected. The controller including a timer for measuring the time period between emission of the ultrasonic signal and receipt of a return signal, the determined time period providing an indication of the liquid level. A radio transmitter receives an indication of the liquid level and transmits a radio liquid level signal to a remote output unit.

Level sensor

A retention device which can be removably retained in a body cavity has branch members which are movably connected to each other such that two relative configurations may be obtained. In one configuration the branch members are nested inside one another for inserting the retention device in a cavity. Once in a cavity an operating member is used to displace the branch members to form the second configuration, in which parts of the branch members are expanded to bear against the walls of the cavity and retain the device.

Retention devices

The device for insertion into a body cavity e.g. the rumen of an animal for example a cattle beast is in the form of a resilient helical coil with bio-degradable portions. The device is deformable to have a smaller dimension to enable insertion through a body passage into the animal cavity. The device carries a drug e.g. progesterone and is retained in the body cavity for a time during which the drug is active. After time has passed the device is broken up by bio-degrading activity into pieces small enough to be discharged naturally by the animal. An applicator is provided.

Relates to devices for administering a substance such as a drug or

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Hamilton, New Zealand

Raymond J Pryor