Patent · US Expired

Automatic defroster system having blower motor and heating element control circuits

US5120932A · kind A · utility

0Cited by

5References

6Claims

0Family size

Assignee

Dr. Ing. h.c. F. Porsche AG · DE

Inventors

Bernhard Ritter · Diedorf, DE
Dieter Fahrlaender · Eberdingen, DE

Key dates

Filing date	Dec 14, 1990
Grant date	Jun 9, 1992
Priority date	—
Expiry date	Dec 14, 2010

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60S1/54
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

An electric heating element for the elimination of condensation, frost or the like on windows of motor vehicles, preferably a rear window of a convertible top, is interconnected with an electric blower motor which includes a relay circuit. For safely operating the heating element, the heating element will only be operative when the blower motor is running. A first relay is used for the control of the blower motor and a second relay for the control of the heating element. The second relay, via a line of a control circuit, is connected to a connecting terminal of the blower motor.

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