Patent · US Expired

Noise barrier pad and the method for the production of same

US4242391A · kind A · utility

10Cited by

7References

2Claims

0Family size

Assignee

Carl Freudenberg · DE

Inventors

Hans-Jurgen Reinhardt · Hirschberg, DE
Manfred Schmahl · Worms, DE
Armin Tritsch · Weinheim, DE

Key dates

Filing date	Jun 13, 1978
Grant date	Dec 30, 1980
Priority date	—
Expiry date	Jun 13, 1998

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24999
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A noise barrier pad and a method for the production of same comprises the steps of forming a tread layer by reacting a mixture for polyurethane foam in a hollow mold having separable upper and lower parts and which is shaped so as to form the tread layer, curing the foam, removing the upper part of the mold, placing a blank of noise barrier material on the surface of the foam which corresponds to the bottom side of the tread layer, and forming a bottom foam layer on the tread layer and barrier material by placing another upper mold constructed in accordance with the bottom layer of the noise barrier pad and defining a cavity over the tread layer and barrier material and filling the cavity with the reaction mixture for the polyurethane foam.

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