Fish tank filter

Details Fish tank filter Fish tank filter

1979-05-29

1980-09-02

Granger, Theodore A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Material level or thickness responsive

210169, B01D 3514, E04H 9320

Patent

active

042205301

ABSTRACT:
A fish tank filter having a maze-like passageway with filtering medium therein through which waste water from the fish tank is passed, and a clogging indicator associated with the passageway for signalling the filtering condition of the medium.

REFERENCES:
patent: 2653908 (1953-09-01), Radda
patent: 3152987 (1964-10-01), Gare
patent: 3633749 (1972-01-01), Panosh
patent: 3669297 (1972-01-01), Willinger
patent: 3720317 (1975-03-01), Willinger
patent: 3746168 (1973-07-01), Willinger et al.
patent: 3848567 (1974-11-01), Garber, Jr.
patent: 3892663 (1975-07-01), Wiedenmann
patent: 3946753 (1976-03-01), Tischler
patent: 4067809 (1978-01-01), Kato

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