Patent · US Active

Filter paper

US12110636B2 · kind B2 · utility

0Cited by

3References

37Claims

0Family size

Assignee

DELFORTGROUP AG · AT

Inventors

Dieter Möhring · Wattens, AT
Guido Reiter · Wattens, AT

Key dates

Filing date	Mar 4, 2019
Grant date	Oct 8, 2024
Priority date	—
Expiry date	Dec 5, 2041

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21H13/26
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Described herein is a filter paper for the production of an aqueous extract, comprising softwood pulp, which has the following properties: a basis weight of more than 9.0 g/m2 and less than 13.5 g/m2, a density of more than 280 kg/m3 and less than 350 kg/m3, a roughness of more than 700 ml/min and less than 1300 ml/min, a bending resistance in the machine direction of more than 50 mN and less than 75 mN, and an air permeability of more than 17000 cm/(min·kPa) and less than 26000 cm/(min·kPa), wherein the filter paper is either free from abacá fibers and sisal fibers or, if abacá fibers and/or sisal fibers are present, taken together they make up less than 20% of the paper mass.

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