Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Reexamination Certificate
2000-03-15
2001-04-10
Drodge, Joseph W. (Department: 1723)
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
C210S087000, C096S422000, C073S861000, C073S861080
Reexamination Certificate
active
06214239
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to water filtering systems. It relates specifically to an apparatus for monitoring usage of a water filter to determine and indicate the need for filter replacement.
2. Description of the Related Art
Water filter systems in counter-top faucet fixtures for drinking water previously have included a carbon filter in a stainless steel tank. After use of the filter over time, for example after three years, the carbon filter should be replaced. However, without an indication of the extent of filter usage, the user may not be aware that the carbon filter should be replaced.
SUMMARY OF THE INVENTION
The apparatus of the invention overcomes the above problems and others associated with prior systems.
It comprises an apparatus for monitoring usage of a water filter, adapted to determine the level of filter usage and indicate the need for filter replacement.
The apparatus includes elements for determining the extent of filter usage, which include elements for processing the flow of water over time, and elements for activating and deactivating the processing elements upon starting and stopping of water flow. The processing elements include a microprocessor, and elements for electronically activating the microprocessor. The activating-deactivating elements include a magnet, movable responsive to starting of water flow and water pressure resulting therefrom, and stopping of water flow and loss of water pressure resulting therefrom, and elements for sensing movement of the magnet and activating or deactivating the processing elements responsive thereto.
It further includes elements for indicating the level of filter usage as determined by the determining elements. The indicating elements include a plurality of indicator lights, adapted such that one of the plurality of indicator lights turns on in sequence dependent upon the level of filter usage as determined by the determining elements.
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Drodge Joseph W.
Fulwider Patton Lee & Utecht LLP
Renau Corporation
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