Noise reduction lining

US4515239A · kind A · utility

Assignee

• Audi NSU Auto Union A.G. · DE

Inventors

• Georg Blatt · Ingolstadt, DE
• Johannes van den Boom · Düsseldorf, DE
• Geert Kuipers · Ingolstadt, DE
• Heinz Hollerweger · Ingolstadt, DE

Key dates

• Filing date: Sep 14, 1983
• Grant date: May 7, 1985
• Expiry date: Sep 14, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B32B2266/0278
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a noise reduction lining of the kind for use in passenger compartments of automobiles for absorbing engine noise of five or six cylinder combustion engines, and comprises between a cover layer and a base layer an absorption layer of open-pored elastic material into which is embedded a perforsted extinction layer.