Patent · US Expired

Capacitive moisture-sensor

US5040090A · kind A · utility

8Cited by

9References

13Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Siegfried Birkle · Höchstadt an der Aisch, DE
Johann Kammermaier · Unterhaching, DE
Albert Hammerschmidt · Erlangen, DE
Gerhard Rittmayer
Hellmut Ahne · Königsee, DE

Key dates

Filing date	Apr 26, 1990
Grant date	Aug 13, 1991
Priority date	—
Expiry date	Apr 26, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49002
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A capacitive moisture sensor with a dielectric consisting of a moisture sensitive polymer which is mounted between two electrodes fulfills all the requirements of capacitive moisture sensors to a high degree, in particular with regard to a high long-term stability, when the organic polymer is a polybenzoxazole or a polybenzothiazole.

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