Patent · US Expired

Filter mat

US4336038A · kind A · utility

18Cited by

8References

6Claims

0Family size

Assignee

Firma Carl Freudenberg · DE

Inventors

Wolfram Schultheiss
Harald Hoffmann · Much, DE

Key dates

Filing date	Aug 28, 1980
Grant date	Jun 22, 1982
Priority date	—
Expiry date	Aug 28, 2000

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S116/41
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A fibrous filter mat of which all or a part of the fibers are coated totally or at least in part with a mixture of at least two dye components which are insoluble in one another, one of said components being fat- and/or oil-soluble and of a color which contrasts with that of the fiber blend and/or of the other component, the other component being fat- and/or oil-insoluble. The mat is especially suited for kitchen exhaust hoods since entrapment of fats and oils causes a color change as the oil-soluble dye dissolves and spreads out.

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