Apparatus for indicating how dirty an air filter is in a vacuum-

Details Apparatus for indicating how dirty an air filter is in a vacuum- Apparatus for indicating how dirty an air filter is in a vacuum-

1991-05-03

1992-08-25

McGraw, Vincent P.

Optics: measuring and testing

With plural diverse test or art

55274, 250573, 340607, 356438, B01D 35143, G01N 2159

Patent

active

051413094

ABSTRACT:
An apparatus is provided for indicating how dirty an air filter is that is disposed in an air stream for removing dirt therefrom. The apparatus includes an arrangement in the form of a light unit for measuring how dirty the air filter is. The apparatus also includes an indicator that is connected to the light unit.

REFERENCES:
patent: 3324633 (1967-06-01), Revell
patent: 3484772 (1969-12-01), Niewyk et al.
patent: 3820897 (1974-06-01), Roess
patent: 4986839 (1991-01-01), Wertz et al.

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