Filter replacement indicator

Details Filter replacement indicator Filter replacement indicator

1990-09-11

1992-07-21

Spitzer, Robert

Gas separation

With nonliquid cleaning means for separating media

Solid agent cleaning member movingly contacts apparatus

55471, 55472, B01D 2708, B01D 2907

Patent

active

051319322

ABSTRACT:
An indicator for indicating values of a variable condition being measured, as for example in a portable air cleaner having replaceable filters subjected to particulates in the air. The indicator is provided with an indicia scale marked off in uniformally spaced graduations with shading between the graduations being non-uniform and proportional to the condition being measured.

REFERENCES:
patent: 2700362 (1955-01-01), Calling
patent: 2707879 (1955-05-01), Dwyer
patent: 3024655 (1962-03-01), Dwyer et al.
patent: 3071914 (1963-01-01), Gesmar
patent: 3172746 (1965-03-01), Shuck
patent: 3201772 (1965-08-01), Ladusaw
patent: 3934543 (1976-01-01), Howard
patent: 4014209 (1977-03-01), Emerick
patent: 4121916 (1978-10-01), Fricke
patent: 4236902 (1980-12-01), Fricke
patent: 4629479 (1986-12-01), Cantoni
patent: 4787922 (1988-11-01), Kulitz

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