Patent · US Expired

Method of manufacturing a randomly patterned floor covering from a preform of rubber

US5154868A · kind A · utility

8Cited by

8References

7Claims

0Family size

Assignee

Firma Carl Freudenberg · DE

Inventors

Klaus Heckel · Weinheim, DE
Herbert Arnold · Eberdingen, DE
Dieter Rischer · Weinheim, DE

Key dates

Filing date	Nov 28, 1990
Grant date	Oct 13, 1992
Priority date	—
Expiry date	Nov 28, 2010

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2031/732
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method of manufacturing a randomly patterned floor covering having contrastingly-colored zones from a preform of rubber in which the preform is cut in pieces, each of which are molded into a blank having projections extending from a top side of the blank in relief-like fashion, solidified by vulcanization and then machined by cutting only in the region of the projections. The rubber forming the contrastingly-colored zones is mixed with contrastingly-colored particles in an amount of at least ten percent by weight. These particles are substantially free of flat surfaces and are in, at least, an advanced state of vulcanization. The particles located in the projections extending from the top side of the blank are exposed during the cutting step.

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