Water purification device and method

Details Water purification device and method Water purification device and method

1989-11-27

1991-03-26

Dawson, Robert A.

Liquid purification or separation

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

210 86, 210 90, 210746, 210774, 210806, 62532, 62540, 324439, C02F 122

Patent

active

050026585

ABSTRACT:
A vessel is provided with a flexible plastic tube containing an electrical contact switch. Impure water is added to the vessel between the tube and the wall of the vessel. The vessel is then placed in a home freezer. Upon partial freezing of the impure water, the ice expands to flex or compress the tube to close the switch so as to actuate a detector or alarm. The user then removes the unfrozen water, and allows a fraction of the ice to melt. The just formed water is checked for purity by a conductivity measurement. If impure, the water is removed, and the ice is allowed to further melt until the desired purity level is reached at which time the remaining ice is melted to obtain purified water. The device and method are particularly suitable for home use to economically obtain purified water.

REFERENCES:
patent: 2340721 (1990-07-01), Whitney
patent: 3838774 (1990-07-01), Dolan et al.
patent: 4448032 (1990-07-01), Hibino et al.
patent: 4496906 (1990-07-01), Clack
patent: 4752740 (1990-07-01), Steininger
patent: 4762611 (1990-07-01), Schipper
patent: 4799945 (1990-07-01), Chang
patent: 4849098 (1990-07-01), Wilcock et al.

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