Patent · US Expired

Smooth-surfaced nonwoven fabric

US4180611A · kind A · utility

8Cited by

5References

4Claims

0Family size

Assignee

Firma Carl Freudenberg · DE

Inventors

Wolfram Schultheiss
Klaus Schmidt

Key dates

Filing date	Dec 1, 1977
Grant date	Dec 25, 1979
Priority date	—
Expiry date	Dec 1, 1997

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T442/673
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A nonwoven fabric having a smooth surface, especially for use as support material for semipermeable membranes, comprising a support mat into which at least one surface thereof, an open-structured, continuous covering layer of fine, thermoplastic particles is calendered.

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