Whistle to signal clogged air filter

Details Whistle to signal clogged air filter Whistle to signal clogged air filter

1980-08-22

1982-03-23

Smith, Robert I.

Gas separation

With nonliquid cleaning means for separating media

Solid agent cleaning member movingly contacts apparatus

116 70, B01D 4600

Patent

active

043210708

ABSTRACT:
A simple two-piece reusable plastic whistle which, when installed in an air filter, emits a shrill tone to signal a predetermined clogged condition of the filter at which time the filter should be cleaned or replaced.

REFERENCES:
patent: 1770094 (1930-07-01), Wickersham
patent: 2682250 (1954-06-01), Ulrich
patent: 3027865 (1962-04-01), Kautz et al.
patent: 3916818 (1975-11-01), Barr

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