Patent ID: 7543479

Claim:
An inspection machine for pressure testing a glass container, comprising: a pressure head locatable on the top of a water filled glass container, a PSI/second air supply connected to said pressure head for subjecting the container to pressure increasing at a linear rate, a control, and a pressure sensor for sensing the pressure within the pressure head and supplying the sensed pressure to said control, said control for operating said PSI/second air supply until a desired maximum pressure is sensed by said pressure sensor in a container that does not burst or leak, determining when a container bursts or leaks, determining, when a container bursts or leaks, the slope of the pressure curve as it falls off from a maximum value below said desired maximum pressure, identifying the container as a burst container when said slope exceeds a defined slope, identifying the container as a leaker when said slope is less than the defined slope, and when in a predetermined number of successive containers the pressure curve falls off from a maximum value and said slope is less than said defined slope, identifying a maintenance problem.