Patent · US Expired

Diaphragm for loudspeaker

US5056617A · kind A · utility

4Cited by

8References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Joachim Wank · Dormagen, DE
Werner Waldenrath · Cologne, DE
Dieter Freitag · Krefeld, DE

Key dates

Filing date	Sep 8, 1989
Grant date	Oct 15, 1991
Priority date	—
Expiry date	Sep 8, 2009

Classification

Technology area (CPC H)Electricity
CPC primaryH04R7/127
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The positive characteristics of loudspeaker diaphragms are improved by the use of a thermoplastic polyurethane sheet with a thickness of 0.06 to 0.8 mm at least for the moving part (1).

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