Patent · US Expired

Pressure measuring device

US4457180A · kind A · utility

5Cited by

1References

3Claims

0Family size

Assignee

Hans List · AT

Inventors

Helmut List · Graz, AT
Peter Claassen · Ludwigshafen, DE
Rudolf Zeiringer · Graz, AT

Key dates

Filing date	Jun 9, 1982
Grant date	Jul 3, 1984
Priority date	—
Expiry date	Jun 9, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/86815
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A pressure measuring device is provided with a change-over valve connecting the pressure sensor either with the pressure to be measured or with a reference pressure. The change-over valve is actuated by a separate control pressure and will protect the pressure sensor from the influence of the pressure medium to be measured in the spring-loaded idle position of the valve.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.