Patent · US Expired

Indicating apparatus for indicating a vacuum

US5744770A · kind A · utility

3Cited by

8References

12Claims

0Family size

Assignee

Filterwerk Mann & Hummel GmbH · DE

Inventors

Klaus Moessinger · Löwenstein, DE
Stefan Kochert · Waiblingen, DE

Key dates

Filing date	Feb 7, 1996
Grant date	Apr 28, 1998
Priority date	—
Expiry date	Feb 7, 2016

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D2279/60
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

An indicating apparatus for indicating a vacuum, particularly for indicating the vacuum on the filtered-air side of an air filter for an internal-combustion engine, including a housing and a piston which is movably disposed in the housing and which separates a vacuum area from an anbient-pressure area. A snap element is provided which is activated by the piston and, at a predetermined vacuum, triggers an electric contact.

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