Patent · US Expired

Sound absorbing irregularly shaped panel

US4420526A · kind A · utility

40Cited by

1References

10Claims

0Family size

Assignee

Firma Carl Freudenberg · DE

Inventors

Hermann Schilling · Weinheim, DE
Reinhard Stief · Weinheim, DE

Key dates

Filing date	Sep 29, 1981
Grant date	Dec 13, 1983
Priority date	—
Expiry date	Sep 29, 2001

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24777
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

A panel for sound insulation of vehicles or other devices is described which is constructed of a fabric of autogenously and chemically bonded, matted polyester fibers having fine surface pores. The fabric is shaped by compression so that it has a thickness of 1 to 3 mm. and exhibits an acoustical impedance of about 30 to about 100 Rayl.

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