Method and apparatus for inspecting containers
US4213329A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1979 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Jan 23, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.