Air filter status evaluator

Details Air filter status evaluator Air filter status evaluator

2006-12-22

2009-12-22

Smith, Duane (Department: 1797)

Gas separation

Combined or convertible

In motor vehicle

C055S418000, C055S385400, C055SDIG034, C095S273000, C096S380000, C096S381000, C096S382000, C096S383000, C096S384000, C096S385000, C096S386000, C096S387000, C096S388000, C096S417000, C096S421000, C181S141000, C181S209000, C181S211000, C181S284000, C181S296000, C116S266000, C116SDIG025

Reexamination Certificate

active

07635402

ABSTRACT:
An air filter system for an internal combustion engine of a vehicle can have an indicator for signaling restricted flow of air through a replaceable air filter member mounted to a filter assembly. At least one sidewall can be associated with the replaceable air filter member to be positioned with an air stream passing through the air filter member. A resettable air filter status indicator can provide a visually perceivable signal external of the filter assembly. The resettable air filter status indicator can be integrally formed in the sidewall for indicating if a mounted air filter member requires replacement in response to air intake differential pressure with respect to atmospheric pressure on a downstream side of air flow through the replaceable filter member being above a predetermined threshold value.

REFERENCES:
patent: 3716040 (1973-02-01), Herpin
patent: 4224044 (1980-09-01), King
patent: 4445456 (1984-05-01), Nelson
patent: 4737083 (1988-04-01), Meyer
patent: 5850183 (1998-12-01), Berry, III
patent: 6327902 (2001-12-01), Berry, III et al.
patent: 6551389 (2003-04-01), Spannbauer et al.
patent: 6824591 (2004-11-01), Holle et al.
patent: 2009/0007531 (2009-01-01), Haussner et al.
patent: WO 97/18027 (1997-05-01), None

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