Patent · US Expired

Pollen filter

US5951727A · kind A · utility

5Cited by

6References

12Claims

0Family size

Assignee

BEIERSDORF AG · DE

Inventors

Manfred Spies · Bad Bramstedt, DE
Heike Rademacher · Hamburg, DE
Zygmut Kozaczka · Hamburg, DE
Klaus Eberhard Papon · Hamburg, DE

Key dates

Filing date	Nov 7, 1997
Grant date	Sep 14, 1999
Priority date	—
Expiry date	Nov 7, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S55/35
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

An air-permeable filter material for use on doors, door frames, windows or window frames and a method of using the filter material to protect against the ingress of pollen and dirt particles in the environment. The filter material may be composed of fabric or film or a combination of film and fabric, the material having perforations of a diameter of 2-250 .mu.m, and a fixing material for applying the filter material.

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