Internal pressure and vacuum monitoring apparatus
US4117718A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Jul 15, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.