Patent · US Expired

Method of manufacturing light-colored electrically-conductive floor covering

US4670075A · kind A · utility

7Cited by

7References

21Claims

0Family size

Assignee

Firma Carl Freudenberg · DE

Inventors

Klaus Heckel · Weinheim, DE
Gerhard Graab · Mannheim, DE
Hans-Michael Kuhl · Hirschberg, DE

Key dates

Filing date	Nov 5, 1984
Grant date	Jun 2, 1987
Priority date	—
Expiry date	Nov 5, 2004

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24339
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method of making an electrically-conductive floor covering presses a polymeric bottom layer into apertures in a top layer having a higher flow viscosity than the bottom layer, the pressure also bonding the layers together. The bottom layer contains from about 3% to about 80% by weight carbon black or graphite for electrical conduction; the top layer contains not more than about 0.5% thereof. The apertures in the top layer are at least 1 mm in diameter and regularly or irregularly spaced from the next adjacent aperture from about 2 mm to about 40 mm, the area of the apertures not exceeding 40% per unit area of the top layer. The dark color of the bottom layer resulting from its carbon black or graphite content therefore need not significantly affect the appearance of the top layer, but provides electrical conductivity through the apertures.

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