Patent · US Expired

Rotary resistors

US4491823A · kind A · utility

1Cited by

1References

3Claims

0Family size

Assignee

Siegert GmbH · DE

Inventors

Michael John Bergmann · Atlanta, US
Armin Lederer · Schwarzenbruck, DE
Norbert Walliser · Fürth, DE

Key dates

Filing date	Nov 1, 1982
Grant date	Jan 1, 1985
Priority date	—
Expiry date	Nov 1, 2002

Classification

Technology area (CPC H)Electricity
CPC primaryH04R25/00
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A rotary resistor or rheostat used in hearing aids worn behind the ear. Such an application necessitates a small, compact arrangement. The arrangement is provided with a supporting surface acting as a substrate with the prerequisite conductors or resistances applied to the support surface.

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