Patent · US Expired

Filter unit on equipment requiring ventilation free of dust and impurities during operation

US4659349A · kind A · utility

20Cited by

7References

6Claims

0Family size

Assignee

Heidelberger Druckmaschinen AG · DE

Inventors

Anton Rodi · Leimen, DE
Jurgen Reithofer · Schallstadt, DE
Peter T. Blaser · Dielheim, DE

Key dates

Filing date	Jun 24, 1985
Grant date	Apr 21, 1987
Priority date	—
Expiry date	Jun 24, 2005

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S55/29
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A filter device on electrical switch cabinets, housings for electronic systems and like equipment to be maintained free of dust and impurities while being ventilated during operation includes a labyrinth filter disposed in a travel path of ventilating air upstream of an air intake opening of the equipment to be ventilated, the labyrinth filter having means for effecting a plurality of changes in direction of flow of the ventilating air therethrough so as to function in a manner similar to that of a mechanical labyrinth seal.

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