Patent · US Expired

Filter for brewed beverages, especially coffee filter, and process for producing it

US5871644A · kind A · utility

13Cited by

4References

20Claims

0Family size

Assignee

Melitta Haushaltsprodukte GmbH & Co. KG · DE

Inventors

Werner Simon · Seeheim-Jugenheim, DE
Lutz Wittenschlaeger · Hille, DE
Fred Bergmann · Barenburg, DE

Key dates

Filing date	Mar 11, 1997
Grant date	Feb 16, 1999
Priority date	—
Expiry date	Mar 11, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24992
WIPO fieldFurniture, games
WIPO sectorOther fields

Abstract

The invention relates to a filter for brewed beverages, especially a coffee filter, and a process for producing such a filter, in which a fibrous material has pores with an average pore width (d) of at least about 0.1 mm measured at a fiber density of about 50% of the original fiber density of the material. The average pore width (d) is preferably in a range from 0.1 mm to 0.7 mm approximately and more preferably in a range from 0.1 mm to 0.4 mm approximately. The material is preferably paper. The pores are also preferably made by piercing with needles or by subjecting the fibrous material to water jets, providing an irregular pore edge.

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