Benthos, Inc.

Continental Can Company, Inc.

Gary G Hayward

Samuel O Raymond

A control system for providing a closed loop control circuit between a liquid nitrogen dispenser and apparatus for determining internal pressure within a closed can having liquid nitrogen applied thereto whereby the automatic controlling of the volume of liquid nitrogen dispensed into each can is effected. Control data from a pressure test unit is averaged and the average is compared to a preselected set point and converted into a pulse of a width varying in accordance with the average detected pressure of previously filled cans to control the time of dispensing and thus the volume of dispensed liquid nitrogen.

Liquid inert gas dispenser and control

A method is described for causing hollow glass spheres to implode on command while deep in the ocean, whereby to produce an acoustic pulse. Specific means for causing the spheres to implode are described. The invention is useful for seismic work.

Undersea implosion device

A method and apparatus are provided for inspecting vacuum-packed containers. The invention comprises automatically subjecting each container to be inspected to a predetermined force so as to cause each container to emit a click as a result of relative displacement of the container and its liquid contents, and determining whether the container has adequate vacuum by measuring the time interval between application of the predetermined force and the occurrence of the click. In a modification of the invention the pressure determenation is made by generating a signal having an amplitude that varies according to the intensity of the click.

Method and apparatus for inspecting containers

An apparatus and method for monitoring the internal pressure or vacuum in a sealed container is provided which measures the amount of deflection of a flexible wall of the container as a function of the internal pressure. The apparatus provides a first electrical signal representative of the distance between a first point on the flexible wall and a first sensing means and a second electrical signal representative of the average of the distances between at least two other points of the flexible wall and second sensing means. The two signals are compared and a third signal indicative of the deflection of the flexible wall is provided.

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Falmouth, MA, United States of America

Gary G Hayward