Drainage flow detector

Details Drainage flow detector Drainage flow detector

1975-08-06

1976-08-31

Caldwell, John W.

Communications: electrical

Systems

Call station

128 208, 340239R, 73194R, G08B 2100

Patent

active

039784622

ABSTRACT:
A drainage flow detector for predicting the clogging of drain lines in which the difference in the time required for air to be exhaled from the drain vent upon discharge of a quantity of waste and the time to inhale that amount of air as the waste drains is determined and compared with predetermined values to give an indication of proper drain operation.

REFERENCES:
patent: 1164882 (1915-12-01), Sommer
patent: 3284788 (1966-11-01), Hudson
patent: 3363461 (1968-01-01), Minkoff
patent: 3425274 (1969-02-01), Clement et al.
patent: 3605729 (1971-09-01), Liu et al.
patent: 3757316 (1973-09-01), Fiorenzo
patent: 3813597 (1974-05-01), Le Vitt

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